2A651H Vol. 2

1. A turbine stage consists of a row of

Rotating vanes followed by a row of rotor blades

Rotating buckets followed by a row of rotor blades

Stationary vanes followed by a row of rotor blades

Stationary buckets followed by a row of rotor blades

2. Once the synthetic oil (MIL-L-23699) container is opened, any oil not immediately used should be

Poured in the trashcan

Disposed of as used oil

Placed in an oil can for shop use

Stored in special metal cabinets until it can be used

3. What would you use to check for pressure leaks on an engine/module shipping container?

Engine oil

Dry nitrogen

A leak detector

A soap-water solution

4. If more than one engine is to be removed from the aircraft, what must be maintained?

Aircraft balance

External electrical power

Hydraulic booster pressure

Equal amounts of fuel in each tank

5. In a gas turbine engine, which type of turbine is normally used?

Reaction

Pulsation

Impulse-reaction

Pulsation-reaction

6. Which instrument is used to measure atmospheric pressure?

Barometer

Thermometer

Psychrometer

Potentiometer

7. What must you do to an engine that will be inactive for more than 180 days?

Motor the engine to circulate the oil

Inspect the reservoirs to ensure they are full

Visually inspect the compressor for corrosion

Perform a preservation run and preserve the fuel system

8. Through which section of a jet engine is energy expended into the atmosphere, resulting in thrust?

Turbine

Exhaust

Diffuser

Combustion

9. The compressor bleed air valves are forced open by

Motors

Air pressure

Electrical power

A pressure relief valve

10. What is the total gear reduction ratio of the reduction gearbox (RGB)?

3.125:1

4.333:1

12.85:1

13.54:1

11. What is used to seal a male flared-type tube fitting on an engine being prepared for air shipment?

Caps

Plugs

Plastic wrap

Barrier wrap

12. The total range in US gallons of each oil quantity indicator is 0 to

10

12

15

20

13. The amount of ram air passing through the oil cooler core is regulated by the

Thermostat

Flap actuator

Size of the core

Regulating valve

14. If a fuel nozzle is disassembled, you

Can replace it

Must replace it

Can reassemble and reinstall it

Must reassemble and reinstall it

15. Which compressor section assembly disperses compressor discharge air and directs it to the combustion chambers (liners)?

Diffuser

Compressor rotor

Compressor housing

Compressor air inlet housing

16. The fir tree method of turbine bucket attachment is

Turbine buckets fitted solidly into the rim of the rotor disk

Rivets placed in holes through the base of the turbine bucket

A close-fitting shroud ring around the outer perimeter of the disk

A series of grooves or notches broached in the rim of the turbine rotor disk

17. Newton's Third Law of Motion explains why an operating jet engine produces

Forward thrust

Forward acceleration

Increased acceleration

Decreased acceleration

18. The temperature of compressed air in a jet engine must be raised to

Increase energy

Decrease energy

Increase volume

Decrease volume

19. Which section of a jet engine keeps the compressor rotating?

Turbine

Exhaust

Diffuser

Combustion

20. The stoichiometric ratio or the perfect mixture used for the combustion chamber burning process is an air-to-fuel ratio of

10:1

10:5

15:1

15:5

21. The anti-icing air valve assemblies are mounted on each side of the air inlet housing at the

2 and 7 o'clock positions

3 and 9 o'clock positions

5 and 10 o'clock positions

6 and 12 o'clock positions

22. Which type of valve is normally incorporated in an oil filter assembly?

Check

Relief

Bypass

Pressurizing

23. The torquemeter exciter wheels are in phase when

The shaft power output is transmitted from the power unit

Negative or positive torque is transmitted to the torque indicator

The rectangular teeth on the exciter wheels are aligned at zero torque

There is a change in the torque transmitted to the torque shaft exciter wheel

24. After air is drawn into the guide vanes of a centrifugal compressor, it is subjected to

Radial and Tangential forces

Rotational and Tangential forces

Rotational and Centrifugal forces

Tangential and Centrifugal forces

25. The storage requirements for engines outside in a metal container are to complete the prescribed inspection and represervation periods, and maintain

Ventilatory plugs and caps

Proper nitrogen pressure

Proper engine humidity

Warehouse facilities

26. The amount of twisting deflection is determined by the

Torque Shaft

Reference Shaft

Safety Coupling

Pinion Input Gear

27. Use extreme care when working with labyrinth seals because of their

Soft metal construction, these seals can be damaged easily

Soft metal construction, they are sharp and can cut your hand

Hard metal construction, they are sharp and can cut your hand

Hard metal construction, these seals can damage the bearing races

28. When operating an installed aircraft engine, the aircraft is positioned so the wind is blowing into the

Exhaust or within 30 degrees

Exhaust or within 45 degrees

Intake or within 30 degrees

Intake or within 45 degrees

29. Which component functions as an on-off control for the air supply that is sent to the starter?

Air turbine

Ground start switch

Starter control valve

Secondary fuel pump pressure switch

30. To release the internal air pressure in a shipping container/module, you must remove the

Parting surface nuts

Parting surface bolts

Filler valve on the side of the container

Filler valve on the front end of the container

31. The actual amount of the water vapor in a mixture of air and water is the definition of

Pressure altitude

Relative humidity

Absolute humidity

Atmospheric pressure

32. The entire weight of the T56 turbine section is supported by the

Diffuser inner casing

Diffuser outer casing

Combustion section one-piece outer case

Combustion section one-piece inner casing

33. When is it necessary to exceed 8,000 inch-pounds of torque on all four engines, the aircraft gross weight must be at least

35,000 pounds

65,000 pounds

95,000 pounds

125,000 pounds

34. What is the overall reduction ratio of the reduction gearbox's (RGB) main reduction gear train?

3.125 to 1

4.333 to 1

13.54 to 1

13,820 to 1

35. Which two gears make up the first stage of reduction in the reduction gearbox (RGB)?

Sun and Planetary

Ring and ring coupling

Accessory drive and starter

Pinion input and main drive

36. To determine whether an engine stored in a shipping container is serviceable or repairable you would look at the

Side of the container

Data plates on both halves of the container

Top half on the right panel of the container

Bottom half on the left panel on the container

37. When the engine is operating at a throttle setting of Flight Idle or above, what preset limit of inch-pounds of torque must be exceeded in order for the negative torque signal (NTS) system to actuate the actuator rod?

-1,020 + 400

-1,140 + 500

-1,260 + 600

-1,380 + 700

38. When there is a difference between the actual and the scheduled turbine inlet temperatures, the difference is corrected by

Altering fuel flow

Altering oil pressure

Increasing oil temperature

Increasing fuel temperature

39. The four sections of the T56 engine power unit are the compressor, combustion, turbine, and

Torquemeter

Safety coupling

Reduction gearbox (RGB)

Accessory drive housing assembly

40. The standard atmospheric pressure in pounds per square inch (psi) is equal to

13.5 psi

14.7 psi

29.92 psi

40.55 psi

41. In the power section pressure oil system, which valve located in the main pump is used to bypass the excess oil?

Pressure-regulating

Breather-regulating

Scavenge-regulating

Anti-icing-regulating

42. During reduction gearbox (RGB) removal with the propeller installed, which check must be performed prior to removing the propeller?

Go-no-go

Retaining nut torque

Pinion gear input bushing

Vertical movement and end play

43. Which position is the propeller brake in when the aircraft is on the ground and the engine is stopped?

Locked

Applied

Engaged

Released

44. What is not a component of the oil cooler flap position indicating system?

Bulb

Indicator

Transmitter

Actuator and motor

45. The major sections of a turboprop engine are the power unit, torquemeter assembly, and

Turbine assembly

Compressor assembly

Combustion assembly

Reduction Gearbox (RGB) assembly

46. Which tester is used to accomplish the checkout procedures for the T56 engine ignition system?

Fuel nozzle

Thermocouple

Temperature datum

Electrical components

47. The rate of fuel flow to the engine is measured by the fuel

Control

Flow meter

Flow indicator

Quantity indicator

48. Oil from the interior of the air inlet housing drains into the bottom of the

Main oil pump

Accessory drive housing

External scavenge oil pump

Compressor front bearing cage

49. The time difference between the torque and the reference shaft signals is converted to a direct current (DC) voltage by a

Timing switch

Phase detector

Amplifier rotor

Synchronous motor

50. Which type of oil pump is used on the T56 engine?

Gear

Float

Gerotor

Centrifugal

51. For the safety coupling to disconnect the power unit from the reduction gearbox (RGB), torque must reach between

1,200 and 4,200 inch-pounds

4,200 and 7,200 inch-pounds

-1,200 and -4,200 inch-pounds

-4,200 and -7,200 inch-pounds

52. What instruction provides guidance concerning reflective materials and the use of maintenance stands and lifting devices?

The intermediate maintenance technical order (TO)

Air Force Instruction (AFI) 36-2903

The flight-line job guide (JG)

AFI 91-203

53. During flight range operation, what maintains the T56 engine at a constant engine speed of 13,820 revolutions per minute (RPM)?

Fuel control

Electrical system

Hydraulic control system

Propeller governing system

54. What is not a propeller brake position?

Locked

Applied

Engaged

Released

55. Preservation of a component being shipped is required when it is being returned to depot or if it is to be stored for more than

45 days

30 days

10 days

5 days

56. If the reduction gearbox (RGB) on No.4 engine was replaced

No action required

You must bleed the entire hydraulic system

You must bleed the utility hydraulic system

You must bleed the booster hydraulic system

57. Thermocouple terminal leads connect the thermocouples to the turbine inlet temperature (TIT) indicator and the

Temperature datum (TD) valve

Primary fuel pump

TD amplifier

Fuel control

58. Combustion section design has helped prevent igniter plug fouling by

Gold plating on the plug

Ceramic coating on the plug

Directing air around the plug electrodes

Distributing heat evenly on the plug electrodes

59. When the engine is operating below Flight Idle, the negative torque signal (NTS) system is

Mechanically locked in

Electronically locked in

Mechanically locked out

Electronically locked out

60. Before assembling engine bearings,

Clean and dry them

Separate the halves

Apply a preservative

Perform a spin check

61. When calculating engine performance, do not use the airplane outside air temperature gage because

It's not alcohol thermometer

The reading must be in Fahrenheit

The probe is not close enough to the engine

You may introduce error due to probe exposure

62. You can adjust the temperature datum (TD) valve Null orifice when a fuel control is changed or an engine

Shows low power

Starts hot and fast

Starts hot and slow

Starts cold and fast

63. The power section and reduction gearbox (RGB) oil systems are joined together at the

Fuel heater and strainer

External scavenge oil filter

External scavenge oil pump

Scavenge element of the main pump

64. The purpose of the oil quantity indicating system is to show the

Engine's low oil display

Amount of oil the engine is using

Total amount of engine oil in the tank

Amount of oil pressure in the transmitter

65. The cheapest type of compressor to manufacture is the

Axial-flow, because of its size

Centrifugal, because of its size.

Axial-flow, because of its simplicity

Centrifugal, because of its simplicity

66. The torquemeter components that have matching serial numbers include the torque meter

Shaft and safety coupling

Housing and safety coupling

Shaft and torque meter pickup

Housing and torque meter pickup

67. Which component receives 120% of the engine fuel requirement?

Temperature datum (TD) valve

Fuel control

Fuel nozzle

TD control

68. During operations, of the dual-spool compressor, the revolutions per minute (RPM) of the N2 (aft) compressor rotor is determined by the

Starter

Fuel Control

Low-Pressure Turbine

Changes in altitude and air temperature

69. After removing the turbine rear scavenge pump and before removing the turbine-to-compressor tie bolt from the T56 engine, you must perform a

Nominal settings check

Rear-of-van clearance check

Front-of-vane clearance check

Compressor rear bearing check

70. Which switch energizes the starter control valve to the OPEN position?

Ground start

Speed-sensitive

Fuel enrichment

Secondary fuel pump pressure

71. The torquemeter indicator calibration check on a C-130 aircraft is performed with the engine running at

Idle

Flight idle

Low-speed ground idle

High-speed ground idle

72. At what percent of engine revolutions per minute (RPM) is the ignition system turned off?

16% rpm

30% rpm

65% rpm

94% rpm

73. Which law may you sum up with the words action and reaction?

Bernoulli's Principle

Newton's First Law of Motion

Newton's Second Law of Motion

Newton's Third Law of Motion

74. Which technical order (TO) covers the inspection of an engine after an aircraft accident or if it was dropped during handling?

00-20-4

2J-1-14

2J-1-19

33-1-37-1

75. The ratio of the amount of water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure is the definition of

Pressure altitude

Relative humidity

Absolute humidity

Atmospheric pressure

76. How many and what type of fuel pumps are contained in the fuel pump and filter assembly?

3 gear; 1 boost

2 gear; 2 boost

2 gear; 1 boost

1 gear; 2 boost

77. What are used to retain the turbine buckets in the first-stage wheel of the T56-A-15 engine?

Cotter pins

Curvic splines

Cover plate seals

Anti-rotation pins

78. Which type of horsepower is the power developed within the combustion chambers without reference to friction losses within the engine?

Brake

Indicated

Frictional

Equivalent shaft

79. The reduction gearbox (RGB) oil system pressure is adjusted by turning the screw on the

Scavenge filter

External scavenge

Pressure-adjusting valve

Pressure-regulating valve

80. The stationary (stator) vane blades on the T56 compressor are used to

Increase velocity

Increase pressure

Decrease pressure

Prolong compressor life

81. The manifold pressure switch opens to de-energize the fuel enrichment relay when fuel pressure in pounds per square inch (PSI) in the manifold reaches

30 psi

40 psi

50 psi

60 psi

82. The component that allows 14th stage air to close the bleed air valves is the

Balance line

Bleed air valve

Speed-sensitive valve

Speed-sensitive control

83. Which shaft delivers the speed of the power unit to the accessory housing?

Torque

Reference

Pinion input

Compressor extension

84. The purpose of the guide vane support is to direct airflow

Out of the turbine section

Into the combustion section

Onto the turbine rotor blades

Toward the compressor stator blades

85. The percent of revolutions per minute (RPM) the speed-sensitive control lets electrical current flow to the fuel and ignition system is

16% rpm

30% rpm

65% rpm

94% rpm

86. Bleed air flowing through which component increases airflow through the cooler?

Oil cooler flap

Oil cooler ejector

Augmentation valve

Augmentation manifold

87. How many overheat detectors are in the nacelle overheat system?

3

4

5

6

88. If a stored engine/module is in the shipping container/module, the container will be sealed and pressurized in pounds per square inch, gage (psig) with dry air or nitrogen to

2+1 psig

5+1 psig

7+1 psig

10+1 psig

89. Torque is transferred from the power unit to the safety coupling on the reduction gearbox (RGB) by the

Torque Shaft

Reference Shaft

Torquemeter Housing

Compressor Extension Shaft

90. The measurement used to properly install the turbine-to-compressor tie bolt is the turbine rotor

Total travel

Nominal setting

Axial movement

Front-of-vane clearance

91. "An unbalanced force on a body produces or tends to produce acceleration in the direction of the force and that the acceleration, if any, is directly proportional to the force and inversely proportional to the mass of the body." This statement is?

Bernoulli's Principle

Newton's First Law of Motion

Newton's Second Law of Motion

Newton's Third Law of Motion

92. When the engine is running above 23% revolutions per minute (RPM), the propeller brake is held in the position by the

Release spring

Starter gear and helical splines

Outer member and accessory drive gear

Reduction gearbox (RGB) system oil pressure

93. The purpose of the oil temperature indicating system is to show the temperature of the engine oil

In the scavenge system

After returning through the oil cooler

Before it is sent to the oil pressure system

After returning to the oil quantity tank unit

94. Prior to conducting an engine performance run, what system is calibrated with a minimum performance run using the performance calculator?

Turbine inlet temperature (TIT)

Revolutions per minute (rpm)

Torque meter indicating

Fuel flow

95. Which component sends the fuel to the fuel manifold?

Temperature datum (TD) valve

Main fuel pump

TD amplifier

Fuel control

96. What compares the desired throttle setting from the coordinator with the actual turbine inlet temperature signal from the thermocouples?

Temperature datum (TD) valve

Speed-sensitive control

TD potentiometers

TD amplifier

97. The anti-icing solenoid valve is

Normally open

Energized open

Normally closed

De-energized closed

98. During a turbine overheat condition, which component is a current flow-interrupting device that causes the fire emergency handles to flash?

Keyer unit

Control unit

Phase detector

Fire warning switch

99. In the T56 engine, turbine rotor torque is transferred to the compressor rotor torque by the

Turbine coupling shaft

Torquemeter outer shaft

Compressor extension shaft

Turbine to compressor tie bolt

100. In the fire warning system, which component contains the relay that illuminates the master fire warning light and the fire emergency handle lights?

Keyer unit

Control unit

Phase detector

Fire warning switch