# Module 3 : Electrical Fundamentals

174 Questions | Attempts: 9855  Settings  This is only a preparation for EASA Module 3 and not an official EASA exam.

• 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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