Module 3 : Electrical Fundamentals
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This is only a preparation for EASA Module 3 and not an official EASA exam.
- 1.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
- 2.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
- 3.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
- 4.Two isolated charges have dissimilar polarities. The force between them will be:
- A.
A force of attraction
- B.
A force of repulsion
- C.
Zero
- 5.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
- 6.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
- 7.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
- 8.
![The unknown current shown in the figure will be: - ProProfs]( "The unknown current shown in the figure will be:")
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
- 9.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
- 10.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
- 11.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
- 12.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
- 13.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
- 14.
![Identify the components shown. - ProProfs]( "Identify the components shown.")
Identify the components shown.- A.
Generators
- B.
Inductors
- C.
Transformers
- 15.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
- 16.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
- 17.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
- 18.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
- 19.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
- 20.A material in which there are no free charge carriers is known as
- A.
Conductor
- B.
Insulator
- C.
Charges
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