Quiz  /  Alternating Current and Voltage Gate & PSU MCQ Questions With...

  • 1. 
    A vector quantity has

  • Only magnitude
  • Only direction
  • Both (a) and (b)
  • none of these

  • 2. 
    The repetition of a variable quantity, recurring at equal intervals, is known as ___________

  • Waveform
  • Instantaneous value
  • Cycle
  • Period

  • 3. 
    The variation of a quantity such as voltage or current shown on a graph is known as ___________

  • Waveform
  • Peak value
  • Instantaneous value
  • Period

  • 4. 
    In AC generator, maximum emf generated at an angle of

  • 0 and 90
  • 90 and 180
  • 90 and 270
  • 180 and 360

  • 5. 
    The effective voltage value is

  • 25%
  • 50%
  • 71%
  • 90%

  • 6. 
    The number of instantaneous values between zero and the peak value is

  • Zero
  • One
  • Eleven
  • Infinity

  • 7. 
    Alternating voltage (V) is represented by the equation

  • V(t) = Vm eωt
  • V(t) = Vm sin ωt
  • V(t) = Vm cot ωt
  • V(t) = Vm tan ωt

  • 8. 
    The average current/ voltage value will not be zero only if it is

  • step up
  • rectified
  • amplified
  • intensified

  • 9. 
    AC generators works based on

  • Faraday's Law
  • Lenz Law
  • Newton's Law
  • electrostatic law

  • 10. 
    The resistor in an AC will cause

  • no phase difference
  • V lead I
  • I lead V
  • I lags V

  • 11. 
    Voltage leads the current in an AC generators can be referred to

  • resistance
  • capacitance
  • inductance

  • 12. 
    AC generators used to produce alternating current by converting

  • kinetic energy into potential energy
  • potential energy into electrical energy
  • kinetic energy into electrical energy
  • electrical energy into kinetic energy

  • 13. 
    High potential voltage produced by three-phase generators commonly used in

  • filament
  • X-ray tube
  • transformer
  • anode

  • 14. 
    The combination of resistance, capacitance and induntance is referred to

  • impedance
  • reactance
  • angular frequency
  • amplitude

  • 15. 
    The most common waveforms of ac is

  • square wave
  • triangular wave
  • complex wave
  • sine wave

  • 16. 
    What is the duration of one cycle known as _________

  • Waveform
  • Peak value
  • Instantaneous value
  • Period

  • 17. 
    The distance of the waveform travel in one cycle is referred to

  • amplitude
  • wavelength
  • time
  • frequency

  • 18. 
    The maximum instantaneous value measured from zero value is known as?

  • Peak value
  • Peak to peak value
  • Cycle
  • Period

  • 19. 
    The unit of frequency is

  • Cycle
  • Cycle-second
  • Hertz/second
  • hertz
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