Power Electronics MCQs

Option A: low

Option B: High

Option C: moderate

Option D: infinity

Correct Answer: low ✔

Option A: 100 mA

Option B: 500 mA

Option C: 1 A

Option D: 2 A

Correct Answer: 500 mA ✔

Option A: Directly proportional to supply voltage

Option B: Directly proportional to inductance in the circuit

Option C: Inversely proportional to supply voltage

Option D: Both A and B

Correct Answer: Both A and B ✔

Option A: fast acting fuse

Option B: snubber circuit

Option C: metal oxide varistor

Option D: aluminium block

Correct Answer: metal oxide varistor ✔

Option A: 5 KHz

Option B: 10 KHz

Option C: 60 KHz

Option D: 100 KHz

Correct Answer: 100 KHz ✔

Option A: One resistor across the string

Option B: Resistors of the same value across each SCR

Option C: Resistors of different values across each SCR

Option D: One resistor in series with each SCR

Correct Answer: Resistors of the same value across each SCR ✔

Option A: voltage clamping device.

Option B: fuse.

Option C: heat sink.

Option D: snubber circuit.

Correct Answer: voltage clamping device. ✔

Option A: 23 mA.

Option B: 40 mA.

Option C: 10 mA.

Option D: 60 mA.

Correct Answer: 10 mA. ✔

Option A: RL.

Option B: RLC underdamped.

Option C: RLC overdamped.

Option D: RLC critically damped.

Correct Answer: RLC underdamped. ✔

Option A: Suppress dV / dt.

Option B: Increase dV / dt.

Option C: Decrease dV / dt.

Option D: Decrease di / dt.

Correct Answer: Suppress dV / dt. ✔

Option A: 111.9 Ω.

Option B: 11.19 Ω.

Option C: 108 Ω.

Option D: 115 Ω

Correct Answer: 111.9 Ω. ✔

Option A: junction J2 is in reverse bias and J1, J3 is in forward bias.

Option B: junction J3 is in forward bias and J1, J2 is in reverse bias.

Option C: Junction J1, J3 is in reverse bias and J2 is in forward bias.

Option D: Junction J1 and J2 is in forward bias and J3 is in reverse bias.

Correct Answer: junction J2 is in reverse bias and J1, J3 is in forward bias. ✔

Option A: junction J2 is in reverse bias and J1, J3 is in forward bias.

Option B: junction J3 is in forward bias and J1, J2 in reverse bias.

Option C: junction J1, J3 is in reverse bias and J2 is in forward bias.

Option D: junction J1 and J2 is in forward bias and J3 is in reverse bias.

Correct Answer: junction J1, J3 is in reverse bias and J2 is in forward bias. ✔

Option A: 0.01 A.

Option B: 0.002 A.

Option C: 0.009 A.

Option D: 0.004 A.

Correct Answer: 0.004 A. ✔

A.It is related to turn off process of the device.
B. It is related to conduction process of device.
C. It is related to turn on process of the device.
D. Both C and D.

Correct Answer: It is related to turn on process of the device. ✔

Option A: 0.32

Option B: 0.67

Option C: 0.45

Option D: 0.27

Correct Answer: 0.27 ✔

Option A: 30° to 150°.

Option B: 30° to 180°.

Option C: 60° to 120°.

Option D: 60° to 180°.

Correct Answer: 30° to 150°. ✔

Option A: RL.

Option B: RLC underdamped.

Option C: RLC overdamped.

Option D: RLC critically damped

Correct Answer: RLC underdamped. ✔

Option A: it can be turned OFF but not ON with a gate pulse.

Option B: it conducts only during one half cycle of an alternating current wave.

Option C: it can be turned ON but not OFF with a gate pulse.

Option D: it can be turned ON only during one half cycle of an AC.

Correct Answer: it can be turned ON but not OFF with a gate pulse. ✔

Option A: 1.5.

Option B: 0.5.

Option C: 1.0.

Option D: 1.2.

Correct Answer: 0.5. ✔

Option A: 1500 A.

Option B: 6000 A.

Option C: 2121.32 A.

Option D: 4242.64 A.

Correct Answer: 2121.32 A. ✔

Option A: Drain, source, gate

Option B: Two main terminal and a gate terminal

Option C: Cathode, anode, gate

Option D: None of the above

Correct Answer: Two main terminal and a gate terminal ✔

Option A: PNPN device

Option B: A combination of diac and triac

Option C: A set of SCRs

Option D: A set if SCR,diac and triac

Correct Answer: PNPN device ✔

Option A: Diac

Option B: Triac

Option C: SUS

Option D: BCS

Correct Answer: BCS ✔

Option A: Unijunction device

Option B: Device with three junction

Option C: Device with four junction

Option D: None of the above

Correct Answer: Device with three junction ✔

Option A: Diac

Option B: Triac

Option C: Silicon controlled-rectifier SCR

Option D: None of above

Correct Answer: Silicon controlled-rectifier SCR ✔

Option A: 2 terminal switch

Option B: 2 terminal bilateral switch

Option C: 3 terminal bilateral switch

Option D: 3 terminal bidirectional switch

Correct Answer: 3 terminal bidirectional switch ✔