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MCQs 1: Which of following devices has highest di/dt and dv/dt capability?

SIT SITH GTO SCR
Answer Explanation

MCQs 2: Which triggering is the most reliable____________?

Forward voltage triggering Gate triggering dV / dt triggering Thermal triggering
Answer Explanation

MCQs 3: Leakage current flows through the thyristor in_________?

forward blocking mode reverse blocking mode both forward and reverse blocking mode forward conduction mode
Answer Explanation

MCQs 4: Which of the following is disadvantage of fast recovery diodes?

Recovery is only 5 µs Recovery is only 50 µs Doping is carried out None of these
Answer Explanation

MCQs 5: When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ___________?

CB Snubber circuit Voltage clamping device Fast acting current limiting device (FACL fuse)
Answer Explanation

MCQs 6: A power semiconductor may undergo damage due to____________?

High di/dt High dv/dt Low di/dt Low dv/dt
Answer Explanation

MCQs 7: CB used for over current protection of thyristor operates when the fault current is__________?

of long period of short duration both (A) and (B) neither (A) nor (B)
Answer Explanation

MCQs 8: If the anode current is 800 A, then the amount of current required to turn off the GTO is about____________?

20 A 200 A 600 A 400 A
Answer Explanation

MCQs 9: What is used to protect the SCR from over current ________________?

CB and fuse Heat sink Snubber circuit Voltage clamping device
Answer Explanation

MCQs 10: Under normal operating condition voltage clamping device offers impedance of_________?

high value low value zero value moderate value
Answer Explanation

MCQs 11: Which semiconductor device acts like a diode and two transistor?

UJT Diac Triac SCR
Answer Explanation

MCQs 12: Under over voltage condition impedance offered by the voltage clamping device is__________?

low High moderate infinity
Answer Explanation

MCQs 13: The latching current of GTO should be of order

100 mA 500 mA 1 A 2 A
Answer Explanation

MCQs 14: The maximum di/dt in a SCR is____________?

Directly proportional to supply voltage Directly proportional to inductance in the circuit Inversely proportional to supply voltage Both A and B
Answer Explanation

MCQs 15: Example of a voltage clamping device______________?

fast acting fuse snubber circuit metal oxide varistor aluminium block
Answer Explanation

MCQs 16: Switching frequency of SITH is____________?

5 KHz 10 KHz 60 KHz 100 KHz
Answer Explanation

MCQs 17: Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?

One resistor across the string Resistors of the same value across each SCR Resistors of different values across each SCR One resistor in series with each SCR
Answer Explanation

MCQs 18: Thyristor can be protected from over voltages by using____________?

voltage clamping device fuse heat sink snubber circuit
Answer Explanation

MCQs 19: Thyristor can be protected from over voltages by using

23 mA 40 mA 10 mA 60 mA
Answer Explanation

MCQs 20: A single phase full bridge inverter can operate in load commutation mode in case load consists of____________?

RL RLC underdamped RLC overdamped RLC critically damped
Answer Explanation

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