174 Questions
| Attempts: 9855

This is only a preparation for EASA Module 3 and not an official EASA exam.

Questions and Answers

- 1.A material in which there are no free charge carriers is known as
- A.
Conductor

- B.
Insulator

- C.
Charges

- 2.Conventional flow is:
- A.
Always from negative to positive

- B.
In the same direction as electron movement

- C.
In the opposite direction to electron movement

- 3.The power factor in an AC circuit is the same as:
- A.
The sine of the phase angle

- B.
The cosine of the phase angle

- C.
The tangent of a phase angle

- 4.A passenger cabin has 110 passenger reading lamps each rated at 10W 28V. What is the maximum load current imposed by these lamps?
- A.
25.5 A

- B.
39.3 A

- C.
308 A

- 5.Two isolated charges have dissimilar polarities. The force between them will be:
- A.
A force of attraction

- B.
A force of repulsion

- C.
Zero

- 6.The relationship between voltage (V), current (I) and resistance (R) for a resistor is:
- A.
V = IR

- B.
V = R/I

- C.
V = IR * R

- 7.A potential difference of 7.5 V appears across a 15-ohm resistor. Which of the following is the current through the resistor?
- A.
0.25 A

- B.
0.5 A

- C.
2 A

- 8.Which one of the following gives the symbol and abbreviated unit for electrical charge?
- A.
Symbol, Q ; unit, C

- B.
Symbol, C ; unit, V

- C.
Symbol, C ; unit, F

- 9.The unknown current shown in the figure will be:
- A.
11 A flowing towards the junction

- B.
17 A flowing away from the junction

- C.
41 A flowing away from the junction

- 10.An aircraft supply has an RMS value of 115 V. Which one of the following gives the approximate peak value of the supply voltage?
- A.
67.5 V

- B.
115 V

- C.
163 V

- 11.An AC waveform has a period of 4 ms. Which one of the following gives its frequency?
- A.
25 Hz

- B.
250 Hz

- C.
4 kHz

- 12.Which one of the following gives the angle between the successive phases of a three-phase supply?
- A.
60 degrees

- B.
90 degrees

- C.
120 degrees

- 13.The peak value of current supplied to an aircraft TRU is 28 A. Which one of the following gives the approximate value of RMS current supplied?
- A.
10 A

- B.
14 A

- C.
20 A

- 14.A transformer has 2400 primary turns and 600 secondary turns. If the primary is supplied from a 220 VAC supply, which one of the following gives the resultant secondary voltage?
- A.
55 V

- B.
110 V

- C.
880 V

- 15.Identify the components shown.
- A.
Generators

- B.
Inductors

- C.
Transformers

- 16.Decreasing the current in the field coil of a DC generator will:
- A.
Decrease the output voltage

- B.
Increase the output voltage

- C.
Increase the output frequency

- 17.The rotor of an induction motor consists of:
- A.
A laminated iron core inside a 'squirrel cage' made from copper or aluminum

- B.
A series of coil windings on a laminated iron core with connections via slip rings

- C.
A single copper loop which rotates inside the field created by a permanent magnet

- 18.The slip speed of an AC induction motor is the difference between:
- A.
The synchronous speed and the rotor speed

- B.
The frequency of the supply and the rotor speed

- C.
The maximum speed and the minimum speed

- 19.When compared with three-phase induction motors, a single phase induction motors:
- A.
Are not 'inherently' self-starting

- B.
Have more complicated stator windings

- C.
Are significantly more efficient

- 20.A three-phase induction motor has three pairs of poles and is operated from a 60Hz. Which one of the following gives the motor's synchronous speed?
- A.
1200 rpm

- B.
1800 rpm

- C.
3600 rpm

- 21.In a star-connected three-phase system, the line voltage is found to be 200V. Which one of the following gives the approximate value of phase voltage?
- A.
67 V

- B.
115 V

- C.
346 V

- 22.A single-phase AC generator has twelve poles and it runs at 600 rpm. Which of the following gives the output frequency of the generator?
- A.
50 Hz

- B.
60 Hz

- C.
120 Hz

- 23.The slip rings in an AC generator provide a means of:
- A.
Connecting an external circuit to a rotating armature winding

- B.
Supporting a rotating armature without the need for bearings

- C.
Periodically reversing the current produced by an armature winding

- 24.The commutator in a DC generator is used to:
- A.
Provide a means of connecting an external field current supply

- B.
Periodically reverse the connections to the rotating coil winding

- C.
Disconnect the coil winding when the induced current reaches a maximum value

- 25.The brushes fitted to a DC motor/generator should have:
- A.
Low coefficient of friction and low contact resistance

- B.
High coefficient of friction and low contact resistance

- C.
Low coefficient of friction and high contact resistance

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