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Electrical Engineering Mcqs

DIAC are specifically designed to trigger______________?

  • (A)  TRIAC
  • (B)  SCR
  • (C)  GTO
  • (D)  Only (a) and (b)
Submitted By :Ali Uppal


Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?

  • (A)  Diode and capacitor
  • (B)  Capacitor and SCR
  • (C)  Inductor and capacitor
  • (D)  Capacitor and load
Submitted By :Ali Uppal


For similar carrier and modulating signals, the line current used in CSI is__________?

  • (A)  Identical to line voltage in a VSI
  • (B)  Identical to line current in VSI
  • (C)  Identical to phase voltage in VSI
  • (D)  Identical to phase voltage in CSI
Submitted By :Ali Uppal


The carrier which are commonly used in constant – frequency PWM is______________?

  • (A)  Sawtooth carrier
  • (B)  Inverted sawtooth carrier
  • (C)  Triangle carrier
  • (D)  All of these
Submitted By :Ali Uppal


Submitted By :Ali Uppal


A capacitive load in voltage source inverters generates ________________?

  • (A)  Small current spikes and can be reduced by using an inductive filter
  • (B)  Large current spikes and can be increased by using an inductive filter
  • (C)  Small current spikes and can be increased by using an inductive filter
  • (D)  Large current spikes and can be reduced by using an inductive filter
Submitted By :Ali Uppal


Submitted By :Ali Uppal


The main objective of static power converters is to____________?

  • (A)  Obtain an dc output waveform from a dc power supply
  • (B)  Obtain an ac output waveform from a dc power supply
  • (C)  Obtain an dc output waveform from a dc power supply
  • (D)  Obtain an ac output waveform from a ac power suppl
Submitted By :Ali Uppal


During the commutation period in 3 phase converter, overlap time is_____________?

  • (A)  Dependent on the load current
  • (B)  Dependent on the voltage
  • (C)  Dependent on both the load current and load voltage behind the short circuit current
  • (D)  Independent on both the load current and load voltage
Submitted By :Ali Uppal


The control method used for PWM dc – dc converter is______________?

  • (A)  Voltage mode control
  • (B)  Current mode control
  • (C)  Hysteric control
  • (D)  All of these
Submitted By :Ali Uppal