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Electrical Engineering Mcqs

Very large values of modulation index (greater than 3.24) lead to___________?

  • (A)  Square AC output voltage
  • (B)  Sine AC output voltage
  • (C)  Triangular AC output voltage
  • (D)  Trapezoidal AC output voltage
Submitted By :Ali Uppal


Any electrical signal present in a circuit other than the desired signal is known as______________?

  • (A)  Noise
  • (B)  Distortion
  • (C)  Interference
  • (D)  All of these
Submitted By :Ali Uppal


The advantage of using free – wheeling diode in half controlled bridge converter is that

  • (A)  There is always a path for the dc current independent of the ac line
  • (B)  There is always a path for the ac current independent of the ac line
  • (C)  There is always a path for the dc current dependent of the ac line
  • (D)  There is always a path for the ac current independent of the ac line
Submitted By :Ali Uppal


To detect an over – current fault condition, the most reliable method is to connect a_____________?

  • (A)  Current sensor across IGBT
  • (B)  Voltage sensor across IGBT
  • (C)  Current sensor in series with IGBT
  • (D)  Voltage sensor in series with IGBT
Submitted By :Ali Uppal


Harmonics in 3 phase inverters can be reduced by using___________?

  • (A)  Passive filter
  • (B)  Active filter
  • (C)  Both passive and active filters
  • (D)  None of these
Submitted By :Ali Uppal


The on – state voltage drop of IGBT consists of__________?

  • (A)  Drop across the collector junction
  • (B)  Drop across the drift region
  • (C)  Drop across MOSFET portion
  • (D)  All of these
Submitted By :Ali Uppal


The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?

  • (A)  Continuous signal
  • (B)  Large isolating pulse transformer
  • (C)  A train of pulses
  • (D)  None of these
Submitted By :Ali Uppal


The maximum firing angle in the half wave controlled regulator is_____________?

  • (A)  180 degree
  • (B)  190 degree
  • (C)  200 degree
  • (D)  210 degree
Submitted By :Ali Uppal


With increase in firing angle,

  • (A)  Both harmonic distortion and quality of input current increases
  • (B)  Harmonic distortion increases and quality of input current decreases
  • (C)  Harmonic distortion decreases and quality of input current increases
  • (D)  Both harmonic distortion and quality of input current decreases
Submitted By :Ali Uppal


Submitted By :Ali Uppal