Module 3 : Electrical Fundamentals

174 Questions | By Bongzki_02 | Updated: Mar 22, 2022 | Attempts: 9855

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Module 3 : Electrical Fundamentals - Quiz

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