250+ TOP MCQs on Other Thyristor Members-2 and Answers

Power Electronics online quiz on “Other Thyristor Members-2”.

1. The SITH (Static Induction Thyristor) is a
A. 4 terminal, self-controlled device
B. 3 terminal, self-controlled device
C. 4 terminal, un-controllable device
D. 3 terminal, un-controllable device
Answer: B
Clarification: It is just like a GTO but it is p-n-n device.

2. The SITH has
A. gate, anode, cathode
B. base, collector, emitter
C. base, anode, cathode
D. gate, emitter, collector
Answer: A
Clarification: The SITH has 3 terminals viz. gate, anode and cathode.

3. The SITH is a
A. p⁺ n⁺ diode with p⁺ electrodes
B. n⁺ p⁺ n^– diode with p⁺ electrodes
C. p⁺ n n⁺ diode with p⁺ electrodes
D. p n⁺ p⁺ n with p⁺ electrodes
Answer: C
Clarification: The Static Induction Thyristor is a p⁺ n⁺ diode with p⁺ electrodes.

4. The SITH is a
A. normally-off device
B. normally-on device
C. uncontrollable device
D. none of the mentioned
Answer: B
Clarification: The SITH unlike other devices is a normally on-device which can be switched off as and when required.

5. The SITH will act as a diode when the
A. anode is forward biased with zero gate-cathode voltage
B. anode is reversed biased with zero gate-cathode voltage
C. anode is forward biased and a positive gate voltage is applied
D. anode is forward biased and a negative gate voltage is applied
Answer: A
Clarification: Load current flows from anode to cathode as the p⁺ junction is forward biased.

6. In SITH, the magnitude of the anode current can be controlled by
A. controlling the anode-cathode voltage
B. controlling the negative gate bias
C. controlling the positive gate bias
D. it cannot be controlled
Answer: B
Clarification: Controlling the negative gate bias controls the main anode current.

7. The SITH
A. has high reverse blocking capabilities as compared to CTs
B. has low reverse blocking capabilities as compared to CTs
C. has no reverse blocking capabilities
D. none of the mentioned
Answer: C
Clarification: It has no reverse blocking capabilities due to emitter-shorting.

8. The TRIAC’s terminals are
A. gate, anode, cathode
B. MT1, MT2, gate
C. gate1, gate2, anode, cathode
D. MT1, MT2, gate1, gate2
Answer: B
Clarification: TRAIC has MT1, MT2 and a gate.

9. The RCT (Reverse Conducting Thyristor) has
A. a diode in series with the SCR
B. a diode in anti-parallel with the SCR
C. two SCR’s in anti-parallel
D. none of the mentioned
Answer: B
Clarification: A diode in anti-parallel with the SCR is called as a RCT.

10. The TRIAC is most sensitive in the _________ quadrants
A. 1st & 3rd with positive gate current
B. 1st with positive gate current & 3rd with negative gate current
C. 3st with positive gate current & 1rd with negative gate current
D. 1st & 3rd with negative gate current
Answer: B
Clarification: It is the most sensitive when all the voltage,current and gate signal have the same polarities.

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