Electrical Engineering Mcqs

If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?

• (A)  Motoring mode operation
• (B)  Braking mode operation
• (C)  Regenerative mode operation
• (D)  None of these

Answer

Submitted By :Ali Uppal

Regulator sampling PWM is usually used in___________?

• (A)  High power inverters
• (B)  Rectifiers
• (C)  Low power inverters
• (D)  Only

Answer

Submitted By :Ali Uppal

In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?

• (A)  Multiple of two
• (B)  Odd multiple of three
• (C)  Odd multiple of five
• (D)  Odd multiple of seven

Answer

Submitted By :Ali Uppal

In square wave operation mode of 3 phase VSI, the VSI

• (A)  Can control the load voltage
• (B)  Cannot control the load voltage
• (C)  Cannot control the load voltage except by means of dc link voltage
• (D)  Cannot control the load voltage except by means of dc link current

Answer

Submitted By :Ali Uppal

For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?

• (A)  Three inductances
• (B)  Three capacitances
• (C)  Three resistance
• (D)  Three transistors

Answer

Submitted By :Ali Uppal

If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered_____________?

• (A)  120 degree after the zero crossing of the corresponding line voltages
• (B)  60 degree after the zero crossing of the corresponding line voltages
• (C)  120 degree before the zero crossing of the corresponding line voltages
• (D)  60 degree before the zero crossing of the corresponding line voltages

Answer

Submitted By :Ali Uppal

The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?

• (A)  Susceptibility
• (B)  Emission
• (C)  Interference
• (D)  Electromagnetic compatibility

Answer

Submitted By :Ali Uppal

The opposite of susceptibility is___________?

• (A)  Immunity
• (B)  Emission
• (C)  Interference
• (D)  Electromagnetic compatibility

Answer

Submitted By :Ali Uppal

Electric pressure is also called________?

• (A)  resistance
• (B)  power
• (C)  voltage
• (D)  energy

Answer

Submitted By :Ali Uppal

The size of poxvirus is_______________?

• (A)  20 nm
• (B)  200 nm
• (C)  250 nm
• (D)  300 nm

Answer

Submitted By :Ali Uppal