Module 3 : Electrical Fundamentals

20 Questions | Total Attempts: 4665

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Module 3 : Electrical Fundamentals

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


Questions and Answers
  • 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:
    • 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.
    • 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