General Technical Knowledge

1. 52754 The number of lead acid cells required to make up a Twelve Volt Battery is:

8

12

6

10

2. 52878 Synchronous motors are usually supplied by:

Three phase AC

Single phase AC

DC to the stator

DC to the stator and AC to the rotor

3. 52881 If one phase of the supply to a three phase motor fails; then:

The motor will continue to run at the same speed

Will slow down and stop

Will stop immediately

Will run at about half speed but will not start on its next selection

4. 52879 Reversing two phases to a three phase motor will:

Blow the phase fuses

Cause the motor to run in reverse

Overheat the stator windings

Stall the motor

5. 52880 A synchronous motor runs at a speed that depends upon the supply:

Voltage

Current

Reactance

Frequency

6. 52887 A starting circuit for a powerful single phase induction motor might be:

A capacitance starter

A resistance / inductance starter

A cartridge starter

A bump starter

7. 52886 A squirrel cage rotor:

Is not connected to the supply

Is expensive to produce

Rotates at exactly synchronous speed

Is a closed circuit of high resistance

8. 52884 In a synchronous motor; the rotor is:

Energised by DC and it lines up with the magnetic field in the stator

Wave wound

Both AC and DC energised

Impeded by the AC induced into it

9. 52882 The basic principle of operation of a 3 phase induction motor is:

A rotating field created in the rotor

A rotating field created in the stator

A stationary field created in the stator

A stationary field created in the rotor

10. 52876 Where the aircraft's main electrical supply is A.C; DC requirements are met by:

Batteries

T.R.U.S

Inverters

A static inverter

11. 52877 The purpose of an inverter is:

To change AC into DC

To change the frequency of the AC supply

To act as a back up for the alternator

To change DC into AC

12. 52871 If the voltage induced in the secondary windings is greater than that in the primary; then the transformer is:

An autotransformer

A step up

A step down

A magnetic amplifier

13. 48445 The power output of a transformer is:

In proportion to the transformation ratio

In inverse proportion to the transformation ratio

The same as the power input

Increased in a step up transformer

14. 52874 With no load across the output terminals of a transformer:

The current flow will be maximum

The current flow will be negligible

The current will be in phase with the voltage

The voltage in the primary will be always greater than the secondary

15. 52875 A Bridge Rectifier:

Will allow full wave rectification

Will give half wave rectification

Has a high resistance in both directions

Has an output with every other half wave chopped off

16. 52873 A step-up transformer is one in which the number of turns on the secondary winding is:

The same as the primary if the cable diameter is the same

Greater than that on the primary

Less than on the primary

Always the same as on the primary

17. 52862 In a using non-paralleled constant frequency alternators as the primary power source; if both alternators fail:

All non-essential services are lost

All non- essential services will be supplied direct from the battery bus bar

All non-essential services will be supplied from the static inverter

Essential DC consumers only will be supplied from the N Degrees1 T.R.U.; all other DC serviceswill be lost

18. 52863 In normal operation; the split bus bar AC system takes its DC supply from:

Two T.R.U.s which are always isolated

A battery which is supplied from N Degrees 1 T.R.U. only

Two T.R.U.s which are connected together by the isolation relay

The static inverter

19. 52864 The static inverter in the split bus system supplies:

The essential DC consumers

The essential AC consumers

Both essential and non-essential consumers

The batteries

20. 52861 In a using non-paralleled constant frequency alternators as the primary power source:

Essential AC loads are supplied directly from N Degrees 1 AC bus bar

Essential AC loads are supplied directly from N Degrees 2 AC bus bar

Only non-essential AC loads are supplied from the AC bus bars

Essential AC loads are normally supplied from N Degrees 1 AC bus bar via the changeover relay

21. 52869 To prevent high circulating currents between paralleled alternators; the following conditions should be met:

Their voltage and frequency must be the same

Their frequencies must be identical and their phase sequence must be the same

Their voltage; frequency; phase and phase sequence must all be the same

Their inductive and capacitive reactances must match exactly

22. 52868 An earth fault on a bus bar of a parallel generator system:

Would require that the appropriate G.C.B. should open

Would require that the appropriate B.T.B. should open

Would require that both the appropriate G.C.B. and B.T.B. should open

Would require that all alternators should operate independently

23. 52865 In the ; the AC bus bars:

Are automatically connected via the isolation relay if one alternator fails

Are automatically connected via the bus tie breaker if one alternator fails

Can be connected together by switch selection if one alternator fails

Can never be connected together because there is no load sharing circuit

24. 52867 In a parallel alternator operation; should one alternator fail; then:

The other alternators can be selected to supply its load

The failed alternators loads will not be supplied

The G.C.B. of the failed alternator will remain closed to allow its loads to be supplied by theremaining alternators

The S.S.B. will close allowing the three remaining alternators to share all of the load

25. 52850 Before two constant frequency AC generators can be connected in parallel:

Real and reactive loads must match. Frequency; phase and voltage must be within limits

The synchronisation lights on the alternator control panel must be fully bright

26. 48444 If an alternator is run at below normal frequency; then:

Electric motors will stop

Inductive devices will overheat

Lights will become dim

Lights will become brighter

27. 52837 A fault on one phase of a three phase AC star connected system would:

Have no effect

Effect only the phase concerned

Cause inductive loads to overheat

Affect all three phases

28. 52836 A diode:

Has a high resistance in one direction and a low resistance in the other

Has a high inductance in one direction and a low resistance in the other

Has a low resistance in both directions

Has a high resistance in both directions

29. 52846 The load meter; upon selection to 'kVAR' would indicate:

Total power available

Reactive loads

Active loads

Only DC resistive loads

30. 52857 Frequency wild AC is produced when:

A transformer winding open circuits

The voltage regulator is malfunctioning

The rotational speed of the generator varies

The alternator becomes angry

31. 52858 A constant frequency AC supply in an aircraft with only frequency wild generators is provided by:

An inverter

A diode

An auto-transformer

A rectifier

32. 48442 An alternator is:

A reversing input switch

An AC generator

A DC generator

A static inverter

33. 52855 If an alternator output is frequency wild; it would normally be used for:

Flight instruments

Charging a battery

All AC equipment

Prop and engine de-icing systems

34. 52852 In a speed parallel operation alternator system:

Each alternator has its own constant speed drive unit

All engines are run at the same speed

All alternators are driven by the same engine

Engine speed is governed by the constant speed drive unit

35. 52856 The generator output voltage is increased by:

Putting more load on it

The frequency controller

Decreasing the generator field voltage

Increasing the generator field current

36. 52844 The A.P.U. generator can only be used when:

Another generator is on line

The aircraft is on the ground

The bus bars are being fed from another source

When no other power source is feeding the bus bar

37. 52838 In the event of a mechanical failure occurring in the generator; the C.S.D.U. is protected by:

A hydraulic clutch

A universal joint

A quill drive

A feather drive

38. 52849 Malfunction of a C.S.D.U. requires:

Automatic electrical disconnection of the drive at any time in flight

That the input drive will shear on the ground only

Operation of the drive disconnect switch at any time in flight

Operation of the drive disconnect switch on the ground only

39. 52841 When selected to 'kW'; the alternator load meter will indicate the:

Total circuit load

Real load

Reactive load

Current flowing in the field

40. 52835 A 400 Hz supply has:

An output capacity of400;000 watts

An impedance of400 ohms

A frequency of 400 cycles per second

A frequency of 400 cycles per minute

41. 52859 An alternator normally used to supply an aircrafts power system would be:

Single phase

Three phase

Two phase

Frequency wild

42. 52847 Disconnection of the C.S.D.U. in flight would be advisable if:

The frequency meter indicated a discrepancy of greater than 5 Hz between alternators

There was an over or under voltage

The oil temperature was high or the oil pressure was low

The engine failed

43. 48443 The number of separatre stator windings in an AC generator determines:

The output voltage of the supply

The output frequency of the supply

The power factor

The number of phases present in the supply

44. 52839 Paralleled alternators will have:

One load meter which measures total system load

One voltmeter for each alternator

One load meter for each alternator

One meter which indicates both voltage and frequency

45. 52845 In the event of a mechanical malfunction of the alternator:

The drive disconnect unit will automatically separate the C.S.D.U. from the alternator

The real load will be adjusted to compensate

The quill drive will fracture

The C.S.D.U. oil temperature will decrease

46. 52848 Oil for the operation of a C.S.D.U. is:

Supplied from the engine oil system

A separate self contained supply

Drawn from a common tank for all C.S.D.U.s

Only required for lubrication purposes

47. 48448 To ensure correct load sharing on paralleled alternator:

Both real and reactive loads should be balanced

Actual loads should be the same

Reactive loads should be the same

The load impedance should be constant

48. 48451 A three phase AC system can be used to supply:

Both one or three phase equipment

Only three phase equipment

Only single phase equipment

Only inductive or capacitive loads

49. 52854 A frequency wild alternator must be:

Paralleled

A rotating magnet type

Self exciting

Unparalleled

50. 52842 An AC generator's I.D.U. oil system:

Is self contained

Is common with the engine oil system

Is used only for cooling

Is used only for lubrication

51. 52860 In a Star wound three phase system:

Line voltage equals phase voltage and line current equals .707 times phase current

Line current and voltage are 1.73 times phase current and voltage

Line current equals phase current and line voltage equals .707 times phase voltage

Line current equals phase current and line voltage equals 1.73 times phase voltage

52. 52851 Warnings of C.S.D.U. oil overheat are given in the cockpit by:

Audio warning

An 'oil overheat' warning light

A 'low oil pressure1 warning light

A temperature gauge

53. 52853 An aircrafts constant frequency supply is maintained at:

Between 350 - 450 Hz

Between 380 - 420 Hz

Between 115 - 200 Hz

Between 395 - 495 Hz

54. 48439 The amount of electrical power output for a given generator weight is:

Dependent on the aircraft power requirements

Greater for a DC generator

Greater for an AC generator

Determined by the size of the aircraft

55. 52830 In a ; if the frequency increases:

Current decreases

Current increases

Current flow is unaffected by frequency change

The voltage fluctuates

56. 52829 The voltage output of an AC generator will rise to a maximum value:

In one direction; fall to zero and rise in the same direction

In one direction and remain there

In one direction; fall to zero and rise to a maximum value in the opposite direction

In one direction only

57. 52831 Fuses and circuit breakers are fitted

In DC circuits only

In both AC and DC circuits

In AC circuits only

Only to protect the wiring

58. 48440 One advantage that AC has over DC is:

That TRUs are not required

That the generators require less cooling

That the cables require less insulation

The case with which the voltage can be stepped up or down with almost 100% efficiency

59. 48449 For a modern aircraft powered by an AC system; the ground power unit must supply:

28 volts AC only

200 volts

115 volts; three phase

200 volts; three phase; 400 Hz

60. 52834 The power factor is:

KVA/kW

KW/kVAR

KW/kVA

KVAR/kW

61. 52833 The moving part of an alternator is:

The rotor

The megacycle

The stator

The frequency

62. 48429 The purpose of electrical bonding on aircraft is:

To directly earth the positive lead

To prevent compass malfunctioning and to gather local static charge

To isolate all components electrically and therefore make the static potential constant

To provide a low resistance path for earth return circuits and dissipate local static charges and lightning strikes

63. 48430 Electrical components of aircraft systems are screened to:

Bond the circuit to reduce risk of fire

Prevent them interfering with the function of radio equipment

Prevent short circuits interfering with aircraft equipment

Prevent engine malfunctions

64. 52817 A generator warning light will be illuminated:

When the battery voltage exceeds that of the generator and the cut-out has opened

At night only

When the generator is supplying current to a fully charged batteiy; and no electrical loads are switched on

When the battery charge current is lower than required to maintain its fully charged state

65. 52825 When the battery master switch is switched off in flight:

The generators are disconnected from the bus bar

The battery is isolated from the bus bar

The battery is discharged through the bonding circuit diodes

The battery may overheat

66. 52820 A generator is brought 'on the line' when it is:

Connected in series with other generators

Switched into the electrical circuit in parallel with the other generators

Connected with the ground batteries for starting

Connected to a phase reducer

67. 52826 If the ammeter reads plus 5 amp after engine shut down:

Some switches have been left 'on'

The battery is charging

The generator field switch is 'on'

The ammeter is defective

68. 52819 If one generator fails you should:

Switch off the good generator

Stop and feather the engine concerned

Switch off the failed generator and continue normal use of the electrical system

Switch off the failed generator; and cut down on the electrical services being used

69. 52815 If the generator warning light comes on in flight it indicates that:

The generator is feeding the battery bus bar

The generator is not feeding the battery bus bar

The battery has failed

A rectifier is faulty

70. 52814 In an aircraft electrical system which incorporates a voltmeter; the voltmeter indicates:

The flow in the electrical system before the battery cut-out contacts close

The rate of flow at all times

The pressure in the electrical system before and after the cut-out contacts close

The flow in the electrical system after the battery cut-out contacts close

71. 52828 During flight a malfunction of the generator cut-out would be indicated by:

Overheating of the battery

The ammeter

Lights going out

The current limiter

72. 52824 Loads on a bus bar are:

In series with the generator so that the voltage can be reduced

In parallel so the voltage can be varied

In parallel so the current can be reduced

Determined by the cross sectional area of the lead cable

73. 52809 In an electrical circuit the reverse current cut-out relay will open:

When battery voltage exceeds generator voltage

When circuit voltage is less than generator voltage

When the main output C/B is reset

When the batteries are flat

74. 52812 To prevent circulating currents when more than one generator is being connected to the same bus bar:

Reverse current relays are fitted

The generators are connected in series

Rectifiers are fitted

Differential cut-outs are used

75. 52811 A generator cut-out will open when:

Circuit loads equal the battery voltage

The air temperature reaches 45 DegreesC

Circuit loads equal the generator voltage

Generator voltage falls below battery voltage

76. 52813 A component whose job is similar to a generator cut out is:

A rectifier

A converter

An inverter

A reverse current relay

77. 52818 If a generator fails in flight:

The voltmeter will read maximum

The ammeter reading will decrease

Load sharing circuits will operate

The watt metre will show a increase

78. 52816 A generator failure is usually indicated by:

The ammeter reading decreasing or showing a discharge and a red warning lamp lighting

The voltmeter reading increasing; the ammeter reading showing discharge and a red lamp lighting

The current consuming devices failing to operate

The motor speed increasing

79. 52823 Generator failure is indicted by:

Load sharing circuits connecting

A decrease or discharge in ammeter readings and generator warning light on

An increase in voltmeter readings; a discharge in ammeter reading and generator warninglight on

Failure of electrically driven instruments

80. 52821 In a twin engine aircraft; fitted with two generators; if one should fail:

The failed generator must be isolated

Cut down the air supply to reduce five risks

The failed generator must be stopped

Both generators must be switched off

81. 52810 A generator cut-out is provided:

To prevent the battery over heating

To prevent the battery from being overcharged

To allow the generator to be isolated in a crash

To prevent discharge of the battery through the generator

82. 52827 If the ammeter shows 'no' charge; yet the battery remains charged. Would you look for:

Loose battery connections

Defective voltage regulator

Defective C/B

Defective ammeter

83. 52800 If a circuit is designed for 12 volts - the generator will:

Give parallelled output only

Give controlled 14 volts

14volts wild DC

Give controlled 12 volts

84. 52794 Another name for a number of conductors rotating in a magnetic field is: Choose one answer.

A capacitor

An armature

A condenser

A commutator

85. 52808 Friction clutches are fitted to actuators for:

Protection against mechanical overload

Protection against brake on loads

Protection against non return valve failure

Protection against supply failures

86. 52795 The voltage regulator:

Senses cut out pressure and adjusts field current

Senses generator output pressure and adjusts field current

Senses generator output current and adjusts the field voltage

Senses back EMF

87. 52801 The aircraft electrical generator output is controlled in flight by:

Sensing the generator output pressure

Ram air

A resistance in the generator output circuit

The resistance of the armature circuit

88. 52798 On aircraft; generator voltage is regulated by:

Varying the generator field strength

Increasing and decreasing the load

Changing the generator speed

Changing generator load

89. 52803 Rotary actuators are used for:

Undercarriage retraction

Centre of gravity assessment

Operation of fuel cocks

Movement of control surfaces

90. 52805 AC current from an engine driven generator is converted to DC current by:

A commutator

A convertor

An alternator

A rotary actuator

91. 52791 If a conductor is placed in a magnetic field:

An EMF is induced in the conductor

An EMF is induced in the conductor only when the conductor rotates

The applied resistance assists the back EMF

An EMF is induced in the conductor only when the conductor is stationary

92. 52807 Press to test lights are used:

To indicate to the pilot that the circuit has power and is complete

To control the movement of a rotary actuator

To indicate to the pilot that the circuit has operated

Only to indicate to the pilot that the equipment has malfunctioned

93. 52792 The output of a basic generator before commutation is:

AC

DC and after commutation is AC

DC

Synchronised AC and DC

94. 52804 Actuator normal travel is controlled by:

A clutch

Limit micro switches

Mechanical indicators

Mechanical stops

95. 52793 A DC generator has a commutator whose purpose is to:

Change AC to give a generator output of DC

Change DC to AC

Transmit the generator output to the electrical circuit and to cool the generator

Maintain a constant resistance

96. 52806 Pilots are informed of rotary actuator positions by:

Non return valves

Lights or dolls eye indicators

Travel indicators

Veger counters

97. 52799 In DC electrical generating systems; the voltage regulator controls the system voltage within prescribed limits:

Regardless of varying engine RPM and electrical load; by varying the current in the generator field windings

By means of a relay which closes contacts in the output line when a certain RPM is reached

By temperature

By a variable resistance which limits the voltage given by the batteries

98. 52796 The voltage regulator:

Provides a constant current flow from the generator with changes of generator speed

Senses current output

Maintains a steady generator voltage with changes of generator speed

Regulates the amount of current supplied by the battery to operate the generator

99. 52790 An EMF is induced in a conductor rotating in a magnetic field by:

Capacitive reaction

The reverse current relay

Electro transmission

Electro magnetic induction

100. 52797 Voltage is controlled in a generator by:

A reverse current relay

Moving the brushes

A voltage regulator

It is uncontrollable

101. 52742 An aircraft has a battery with a capacity of 40 amp/hr. Assuming that it will provide its normal capacity and is discharged at the 10 hour rate:

It will pass 40 amps for 10 hrs

It will pass 10 amps for 4 hrs

It will pass 4 amps for 10 hrs

It will pass 40 amps for 1 hr

102. 52744 The method of ascertaining the voltage of a standard aircraft lead-acid battery is by checking:

The voltage on open circuit

The current flow with a rated voltage charge

The voltage off load

The voltage with rated load switched ON

103. 52749 If you connect two identical batteries in series it will:

Double the volts and halve the capacity

Reduce the voltage by 50%

Double the volts and leave the capacity the same

Double the volts and double the amps flowing in a circuit with twice the resistance

104. 52689 A centrifugal breather is used on a gas turbine engine:

To circulate the oil smoothly

To minimise oil loss

To emulsify the oil and air mixture for greater viscosity

To allow oxidisation of the oil

105. 52777 In a compressor:

The air temperature is steady with a pressure rise

The air temperature falls with a pressure rise

The drop in air temperature is inversely proportional to the pressure rise

The air temperature rises with a pressure rise

106. 52769 Under ideal conditions the pressure rise across a centrifugal compressor can be:

1.1 or 1.2 to 1

Not more than 4 to 1

1.5 to 1

30 to 1

107. 52766 To gain a greater pressure ratio than 4:1:

Two centrifugal compressors can be placed in parallel

The compressor diameter must be reduced

The cascade vanes must be convergent

Two centrifugal compressors can be placed in series with each other

108. 52658 A cannular combustion system is:

A set of flame tubes; each of which is mounted in a separate air casing

A set of flame tubes enclosed in a common air casing

One common flame tube enclosed in a common air casing

Superior to the annular system because it only requires one igniter

109. 52660 The air entering the combustion chamber is divided; a small percentage is used in combustion; the rest:

Is syphoned off for airframe anti-icing purposes

Is used only for cooling the gases before they exit the combustion chamber

Is used to reduce the oil temperature and cool the turbine blades

Is used to cool both the gases exiting the chamber and the walls of the air casing

110. 52656 The ratio of air to kerosene to give the greatest heat release during combustion is:

45:1

130:1

12.5 :1

15:1

111. 52657 Of the total airflow entering the combustion chamber the percentage that is mixed with the fuel and burnt is:

10%

40%

20%

60%

112. 52781 A free power turbine:

Has a clutch between the compressor and the power output shaft

Has no mechanical connection with the other turbine or compressor shafts

Has a direct drive with a free wheel unit

Comes free with every 2;000 gallons of AVTUR

113. 52780 Nozzle guide vanes are fitted before the turbine:

To increase the velocity of the airflow

To decrease the velocity of the gas flow therefore increasing its pressure

To increase the velocity of the gas flow therefore reducing its pressure

To increase the temperature of the gas flow

114. 52783 The net operating temperature of a gas turbine engine is limited by:

The materials from which the combustion chamber is constructed

The amount of fuel which can be fed into the combustion chamber

The ability of the compressor to pass sufficient air rearwards

The materials from which the nozzle guide vanes and the turbine blades are constructed

115. 52782 Blade creep is:

Movement of the turbine blades around the turbine disc

Temporary expansion due to temperature change

Temporary elongation due to centrifugal forces

Permanent elongation due to heat and centrifugal force

116. 52664 A nozzle is said to be 'choked' when:

The gas flow through it is subsonic

The gas flow through it reaches its sonic value

The gas temperature rises

The gas flow through it is supersonic

117. 52663 The propelling nozzle is designed to:

Increase the velocity and decrease the pressure of the gas stream

Decrease the velocity and increase the pressure of the gas stream

To increase the velocity and the pressure of the gas stream

To decrease the velocity and the pressure of the gas stream

118. 52665 The exhaust gasses pass to atmosphere via the propelling nozzle which:

Is a convergent duct; thus it increases the gas velocity

Converts kinetic energy into pressure energy

Is a divergent duct; thus it increases the gas velocity

Is a divergent nozzle; thus it increases the gas pressure

119. 52666 The turbine rear support struts:

Add swirl to the gases before they travel down the jet pipe

Prevent the hot gases flowing across the rear face of the rear turbine bearing

Allow entry of the by-pass air into the exhaust system

Straighten out any residual whirl in the gas stream

120. 52661 The velocity of the gases in the exhaust unit is held to:

0.5 Mach to minimise turbulence

0.75 Mach to optimise the pressure distribution

0.85 Mach to maximise thrust

Mach 1 to maximise acceleration

121. 52662 The exhaust cone:

Straightens the gas flow before it goes into the turbine assembly

Prevents the hot gases flowing across the rear turbine face

Increases the velocity of the gases

Decreases the pressure of the gas

122. 52667 An exhaust nozzle is said to be choked when the velocity at the throat is:

Mach.5

Below Mach 1

At Mach 1

Above Mach 1

123. 52670 Before reverse thrust can be selected; the forward thrust lever must be:

Pulled back to idle power

Positioned to reverse minimum power

Put back to the reverser deploy position

Positioned to reverse maximum power

124. 52669 A big fan engine gets reverse thrust by:

Reversing the direction of rotation of the compressor

Deflecting the exhaust gases

Blocking the by-pass air

Reversing the hot stream gases

125. 52672 A Reverse Thrust Warning Light illuminates:

Only when the reverser doors are fully deployed in the reverse thrust position

When the reverser doors are stowed in the forward thrust position

When the reverser doors are not stowed in the forward thrust position

Whenever reverse thrust is selected

126. 52668 Use of reverse thrust below the recommended speed may cause:

Over stressing of the gear oleos

Ingestion of the exhaust gases and foreign objects

More fuel to be provided to the burners

The T.G.T. limit to be exceeded; in which case the reverse thrust lever will return to the forward thrust position

127. 52784 EPR is a:

Ratio between ambient pressure and exhaust pressure

Ratio between ambient pressure and fan pressure

Ratio between intake pressure and compressor delivery pressure

Ratio between exhaust pressure and intake pressure

128. When considering the lCAO International Standard Atmosphere; which of the following statements is correct:

1 -The temperature lapse rate is assumed to be uniform at 2 DegreesC per 1;000 ft [1.98 DegreesC] up to a height of 11;000 ft

2- Sea level temperature is assumed to be 15 DegreesC

3 -Sea level static pressure is assumed to be 1.225 kg/m3 4- Sea level density is assumed to be 1013.25 hPa

1; 2; 3 and 4 Incorrect

No statements are correct Incorrect

1; 3 and 4 Incorrect

2 only Correct

129. 52789 From a standing start with an increase in forward speed jet thrust will:

Increase

Stay the same

Decrease

Decrease then recover but will never achieve its initial setting

130. 52788 As temperature ___ air density _ and the mass of air for given enginespeed _ therefore thrust _. To maintain the compressor speed however _ fuel must be added or the compressor will ___.

Decreases; decreases; increases; increases; less; slowdown

Increases; decreases; decreases; increases; more; slow down

Decreases; increases; increases; increases; more; slow down

Increases; decreases; increases; decreases; less; speed up

131. 52786 With an increase in altitude which of the following statements are correct for a jet aircraft with constant engine speed for a fixed throttle setting?

1.Temperature and pressure reduce with a resulting drop in thrust.

2.Fuel consumption will increase.

3.Fuel consumption will decrease.

4.Specific fuel consumption will increase.

5.Specific fuel consumption will decrease.

6.Specific fuel consumption stays relatively the same

7.Temperature and pressure will reduce; resulting in an increase in thrust

1;3;6

2;4;1

7; 2; 4

1;2;5

132. 52787 The maximum thrust that a jet engine can develop will be:Choose one answer.

Take off thrust

Go around thrust

Max climb thrust

Max Static Thrust

133. 52681 The power supply for the spark in the combustion chamber is:

Low volts high current

Low volt slow current

High volt slow current

High volts high current

134. 52673 The low energy ignition system would be used:

Only for starting the engine on the ground

During take off from wet runways

For re-light at high altitude

During a blow out [motoring over] cycle

135. 52680 The rate of discharge of a High Energy Ignition Unit is:

60 – 100 times per minute

4 discharges per revolution

60 – 100 per second

Governed by the resistance of the igniter plug

136. 52677 A high energy ignition system works on the principle of:

Obtaining power from a step up transformer from the aircraft's A.C. power system

Magneto static induction

Fleming's Right Hand Rule

Obtaining energy from the discharge of a capacitor

137. 52675 Precautionary use of igniters may be necessary during:

Flight through heavy tropical rainstorm

Ground running

Flight through sandy conditions

Flight through very dry air

138. 52674A Re-light is:

The action of re-starting a flamed out engine; usually while airborne

What occurs when the engine drain valve is stuck open

The initiation of the after-burning system

What must be prevented after a 'wet start'

139. 52679 In a High Energy Igniter Unit; the choke:

Protects the unit from excessive voltages

Prolongs the discharge to the plug

Prolongs the life of the igniter

Protects the unit from excessive current

140. 52676 After engine start; the engine igniters are normally deactivated by:

An electric interlock system

A speed switch

The time switch

Centrifugal force

141. 52698 Which of the following statements would be more correct with regard to an APU?

APU's provide emergency hydraulics power for the brakes only

APU's provide electrical; pneumatic and hydraulic power for ground use only

APU's provide electrical; pneumatic and hydraulic power for air use only and can provide anamount of thrust

APU's provide electrical; pneumatic and hydraulic power for ground and air use and can provide an amount of thrust

142. 52699 In the event of a fire in an APU:

Will need to be shut down immediately

Will shut down immediately

Will shut down immediately and if the fire persists the fire bottles will automatically be fired

Will need to be shut down immediately and the fire bottles will be required to be fired immediately

143. 52700 Which of the following would result in a automatic shut down of an APU?

1.overspeed of compressor

2.over-temp of lubrication system

3.turbine over-temp

4.combustion chamber over-temp

5.Compressor outlet pressure exceeded

6.low pressure of lubrication system

1; 2; 3; 6

1; 2; 4; 6

2; 3; 5; 6

2; 3; 4; 6

144. 52701 The power to start an APU comes from:

Ground power unit

Aircraft main DC battery

Aircraft main engine generator

Aircraft main AC battery

145. 52683 Fuel is heated to:

Prevent waxing

Ensure vapour losses are minimised

Make it more viscous

Make it easier to flow under all conditions

146. 52685 Which of the following is a normal stopping device for a gas turbine?

LP shut off valve close

Fuel tank booster pumps select off

HP shut off valve close

Isolate electrics from engine

147. 52686 The fuel flow-meter is situated:

Between LP pump and the FCOC

Between LP pump and HP pump

Just after FCU

Between HP shut off valve and fuel nozzles

148. 52682 Fuel is heated from which of the following?

Air conditioning air

Air from the compressor

Air from the Bootstrap

Air from the turbine

149. 52688 The fuel cooled oil cooler:

Heats the oil and cools the fuel

Heats the fuel only

Cools the oil only

Heats the fuel and cools the oil

150. 52687 Aircraft flying at FL 420. If the booster pumps feeding the engine cease to work:

The engine would close down immediately

151. 52684 In a high by pass engine fuel pumps are driven by:

High pressure turbine

High pressure compressor

Low pressure compressor

Intermediate compressor

152. 52696 The magnetic chip detectors are fitted in:

The pressure line between the pressure pump and the engine

Suction line between the reservoir and the pressure pump

Return line between the engine and the scavenge pump

Return line after the FCOC

153. 52692 The main bearings in an axial flow gas turbine engine are normally pressurised by:

Compressor by-pass air

Air at intake pressure

Air from an intermediate stage of the compressor

Gas from the second stage turbine section

154. 52691 The bearing chambers of a gas turbine engine are vented:

Via the auxiliary gear box drive

Via the centrifugal breather

Via the air seals; into the gas stream

To prevent oil loss

155. 52695 In a Gas Turbine engine oil pressure is measured:

In the engine

In the return line

After the pressure pump

In the FCOC to ensure oil pressure is always above fuel pressure

156. 52727 A fuse is said to have blown when:

An excess current has burst the outer cover and disconnected the circuit from the supply

The circuit is reconnected

157. 52755 Non-spill vents are used on aircraft batteries to:

Prevent spillage of electrolyte during violent manoeuvres

Stop spillage of the water only

Prevent the escape of gases

Prevent spillage during topping-up

158. 52741 An aircraft has three batteries each of 12 volts with 40 amp/hr capacity connected in series. The resultant unit has:

A voltage of 36 and a capacity of 120 amp/hr

A capacity of 120 amp/hr and a voltage of 12

A capacity of 36 amp/hr and 120 watts

A voltage of 36 and a capacity of 40 amp/hr

159. 52738 Two 12V 40 amp/hour batteries connected in series will produce:

12V 80amp/hr

12V 20 amp/hr

24V 80 amp/hr

24V 40 amp/hr

160. 52739 Two 12V 40 amp/hour batteries connected in parallel will produce:

12V 80 amp/hr

24V 80 amp/hr

12V 20 amp/hr

24V 40 amp/hr

161. 52747 A lead acid battery voltage should be checked:

On open circuit

Using a trimmer circuit

With an ammeter

On load

162. 52737 Battery voltage is tested with:

A megometer

A voltmeter on rated load

An ammeter with a rated voltage

A hygrometer

163. 48419 When a generator is on line and its associated ammeter reads 10 amps; this is an indication of:

BTB’s being energized

Battery charge rate

Battery discharge rate

Generator load

164. 52751 The specific gravity of a fully charged alkaline cell is:

0.120-0.130

1.160

1.240- 1.30

1.800

165. 52743 Battery capacity percentage efficiency must always be:

10% above saturation level

Above 70%

Above 80%

Above 90%

166. 52750 The nominal voltage of an alkaline cell is:

2.2 volts

1.8 volts

1.2 volts

0.12 volts

167. 52752 The electrolyte used in the lead acid cell is diluted:

Hydrochloric acid

Sulphuric acid

Boric acid

Potassium hydroxide

168. 52746 The specific gravity of a fully charged lead acid cell is:

1.270

1.090

1.120

0.1270

169. 52753 The electrolyte used in an alkaline battery is a diluted:

A saline solution

Sulphuric acid

Cadmium and distilled water

Potassium hydroxide solution

170. 52756 When the battery master switch is switched off in flight:

The generators are disconnected from the bus bar

The ammeter reads maximum

The battery is isolated from the bus bar

The battery is discharged through the bonding circuit diodes

171. 52745 A battery is checked for serviceability by:

Using an ammeter

Measuring the specific gravity of the electrolyte

A boric acid solution

Using an ohmmeter

172. 52748 In an aircraft having a battery of 24 volts nominal and fully charged the voltmeter would read:

22 volts

24 volts

26 volts

28 volts

173. 52721 If the reset button is pressed in the trip-free circuit breaker; the contacts with the fault cleared will:

Be made and kept made

Only be made if there is a fuse in the circuit

Reset itself only after a delay of 20 seconds

Not be made and the reset will remain inoperative

174. 52735 Fuses:

Protect the load

Protect the cable

Protect the generator

Protect both the circuit cable and load

175. 52723 A non-trip free circuit breaker is:

One which can make a circuit in flight by pushing a button

A wire placed in a conductor which melts under overload

Another type of voltage regulator

An on-off type tumbler switch

176. 52722 A circuit breaker is a device for:

Controlling rotor movement only

Isolating the service on overload

Isolating the battery when using the ground batteries

Earthing the magnetos when switching off

177. 52733 A fuse in an electrical circuit is 'Blown' by:

Cooler air

The breaking of the glass tube

Excess voltage breaking the fuse wire

Excess current rupturing the fuse wire

178. 52731 The size of fuse required for an electrical circuit whose power is 72 watts and whose voltage is 24 volts is:

24 amps

10 amps

5 amps

15 amps

179. 52732 When selecting a fuse for an aircraft circuit the governing factor is:

The voltage of the circuit

Cable cross sectional area

Resistance of the circuit

Power requirements of the circuit

180. 52718 A trip-free circuit breaker that has tripped due to overload:

Can be reset and held in during rectification

Can never be reset

Can be reset after overhaul

Maybe reset manually after fault has been cleared

181. 52724 A non-trip-free circuit breaker that has tripped due to overload:

Can never be reset

Can be reset but must not be held in

Can be reset and held in if necessary

182. 52712 A device consuming 80 watts at 8 amps would have a voltage supply of:

640 volts

12 volts

10 volts

8 volts

183. 52694 In a Gas Turbine engine oil temperature is measured:

As it leaves the fuel cooled oil cooler [FCOC]

Before entering the engine

Immediately after leaving the engine

In the engine

184. 52693 If the engine oil pump ceases to function the engine:

Should be shut down

Should be monitored for a period of time to record oil temperature

185. 52716 Electro-motive force is measured in:

Amps x volts

Watts

Ohms

Volts

186. 52704 The unit measurement of electrical resistance is:

The volt

The watt

The ohm

The ampere

187. 52714 Electrical potential is measured in:

Watts

Bars

Volts

Ohms

188. 52706 The unit used for measuring the E.M.F. of electricity is:

The ohm

The ampere

The volt

The watt

189. 52708 A voltmeter measures:

Electro-motive force

The heat loss in a series circuit

The current flow in a circuit

The resistance provided by the trimming devices

190. 52705 An ammeter measures:

Current

Power dissipation

Differences of electrical potential

Heat energy

191. 52702 The difference in electric potential is measured in:

KVAR's

Watts

Amps

Volts

192. 52707 The unit used for measuring:

Current - is the volt

Resistance - is the ohm

Electric power is the capacitor

E.M.F. ? is the amp

193. 52715 The current flowing in an electrical circuit is measured in:

Volts

Ohms

Inductance

Amps

194. 52713 The symbol for volts is:

E or W

V or E

I or V

R or W

195. 52730 What must be checked before replacing a fuse:

The ohms of the circuit

The amps being used in the circuit

The amps capacity of the consuming device in the circuit

The correct fuse volt or watts rating

196. 52728 In a fused circuit the fuse is:

In parallel with the load

In series with the load

In the conductor between generator and regulator

Only fitted when loads are in series

197. 52736 A current limiter:

Is a fuse with a low melting point

Is a circuit breaker

Is a fuse with a high melting point

Is a fuse enclosed in a quartz or sand

198. 52717 In a circuit fitted with a non trip free circuit breaker if a fault occurs and persists:

If the reset button is depressed and held in; the circuit will be made

The trip button may be pressed to reset; but not permanently

A non trip free circuit breaker can never be by-passed

The reset button may be pressed to make the circuit permanent

199. 52719 Circuit breakers and fuses

Are used in DC circuits only

Are used in AC or DC circuits

Are used in AC circuits only

Are used in low current circuits only

200. 52720 breaker is one which:

Cannot be reset by holding the lever in while the fault persists

Can be reset by holding the lever in while the fault persists

Must be held in during checks to find faults

Can be by passed

General Technical Knowledge

1. 52754 The number of lead acid cells required to make up a Twelve Volt Battery is:

2.

What first name or nickname would you like us to use?

2. 52878 Synchronous motors are usually supplied by:

3. 52881 If one phase of the supply to a three phase motor fails; then:

4. 52879 Reversing two phases to a three phase motor will:

5. 52880 A synchronous motor runs at a speed that depends upon the supply:

6. 52887 A starting circuit for a powerful single phase induction motor might be:

7. 52886 A squirrel cage rotor:

8. 52884 In a synchronous motor; the rotor is:

9. 52882 The basic principle of operation of a 3 phase induction motor is:

10. 52876 Where the aircraft's main electrical supply is A.C; DC requirements are met by:

11. 52877 The purpose of an inverter is:

12. 52871 If the voltage induced in the secondary windings is greater than that in the primary; then the transformer is:

13. 48445 The power output of a transformer is:

14. 52874 With no load across the output terminals of a transformer:

15. 52875 A Bridge Rectifier:

16. 52873 A step-up transformer is one in which the number of turns on the secondary winding is:

17. 52862 In a using non-paralleled constant frequency alternators as the primary power source; if both alternators fail:

18. 52863 In normal operation; the split bus bar AC system takes its DC supply from:

19. 52864 The static inverter in the split bus system supplies:

20. 52861 In a using non-paralleled constant frequency alternators as the primary power source:

21. 52869 To prevent high circulating currents between paralleled alternators; the following conditions should be met:

22. 52868 An earth fault on a bus bar of a parallel generator system:

23. 52865 In the ; the AC bus bars:

24. 52867 In a parallel alternator operation; should one alternator fail; then:

25. 52850 Before two constant frequency AC generators can be connected in parallel:

26. 48444 If an alternator is run at below normal frequency; then:

27. 52837 A fault on one phase of a three phase AC star connected system would:

28. 52836 A diode:

29. 52846 The load meter; upon selection to 'kVAR' would indicate:

30. 52857 Frequency wild AC is produced when:

31. 52858 A constant frequency AC supply in an aircraft with only frequency wild generators is provided by:

32. 48442 An alternator is:

33. 52855 If an alternator output is frequency wild; it would normally be used for:

34. 52852 In a speed parallel operation alternator system:

35. 52856 The generator output voltage is increased by:

36. 52844 The A.P.U. generator can only be used when:

37. 52838 In the event of a mechanical failure occurring in the generator; the C.S.D.U. is protected by:

38. 52849 Malfunction of a C.S.D.U. requires:

39. 52841 When selected to 'kW'; the alternator load meter will indicate the:

40. 52835 A 400 Hz supply has:

41. 52859 An alternator normally used to supply an aircrafts power system would be:

42. 52847 Disconnection of the C.S.D.U. in flight would be advisable if:

43. 48443 The number of separatre stator windings in an AC generator determines:

44. 52839 Paralleled alternators will have:

45. 52845 In the event of a mechanical malfunction of the alternator:

46. 52848 Oil for the operation of a C.S.D.U. is:

47. 48448 To ensure correct load sharing on paralleled alternator:

48. 48451 A three phase AC system can be used to supply:

49. 52854 A frequency wild alternator must be:

50. 52842 An AC generator's I.D.U. oil system:

51. 52860 In a Star wound three phase system:

52. 52851 Warnings of C.S.D.U. oil overheat are given in the cockpit by:

53. 52853 An aircrafts constant frequency supply is maintained at:

54. 48439 The amount of electrical power output for a given generator weight is:

55. 52830 In a ; if the frequency increases:

56. 52829 The voltage output of an AC generator will rise to a maximum value:

57. 52831 Fuses and circuit breakers are fitted

58. 48440 One advantage that AC has over DC is:

59. 48449 For a modern aircraft powered by an AC system; the ground power unit must supply:

60. 52834 The power factor is:

61. 52833 The moving part of an alternator is:

62. 48429 The purpose of electrical bonding on aircraft is:

63. 48430 Electrical components of aircraft systems are screened to:

64. 52817 A generator warning light will be illuminated:

65. 52825 When the battery master switch is switched off in flight:

66. 52820 A generator is brought 'on the line' when it is:

67. 52826 If the ammeter reads plus 5 amp after engine shut down:

68. 52819 If one generator fails you should:

69. 52815 If the generator warning light comes on in flight it indicates that:

70. 52814 In an aircraft electrical system which incorporates a voltmeter; the voltmeter indicates:

71. 52828 During flight a malfunction of the generator cut-out would be indicated by:

72. 52824 Loads on a bus bar are:

73. 52809 In an electrical circuit the reverse current cut-out relay will open:

74. 52812 To prevent circulating currents when more than one generator is being connected to the same bus bar:

75. 52811 A generator cut-out will open when:

76. 52813 A component whose job is similar to a generator cut out is:

77. 52818 If a generator fails in flight:

130. 52788 As temperature ___ air density _ and the mass of air for given enginespeed _ therefore thrust _. To maintain the compressor speed however _ fuel must be added or the compressor will ___.

143. 52700 Which of the following would result in a automatic shut down of an APU?

1.overspeed of compressor

2.over-temp of lubrication system

3.turbine over-temp

4.combustion chamber over-temp

5.Compressor outlet pressure exceeded

6.low pressure of lubrication system