# Electronics and Communication Engineering - Power Electronics

### Exercise :: Power Electronics - Section 7

1.

Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode

Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel

 A. Both A and R are correct and R is correct explanation of A B. Both A and R correct but R is not correct explanation of A C. A is correct but R is wrong D. A is wrong but R is correct

Explanation:

No answer description available for this question. Let us discuss.

2.

In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ωt. The peak inverse voltage is

 A. 2 Vm B. Vm C. 0.5 Vm D. 0.25 Vm

Explanation:

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3.

Which statement is correct?

 A. BJT and MOSFET are current controlled devices B. BJT is voltage controlled and MOSFET is current controlled device C. BJT and MOSFET are voltage controlled devices D. BJT is current controlled and MOSFET is voltage controlled device

Explanation:

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4.

In a three phase series inverter, the firing frequency is

 A. three times output frequency B. six times output frequency C. twice the output frequency D. equal to output frequency

Explanation:

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5.

A 3 phase fully controlled converter is a

 A. 3 pulse converter B. 6 pulse converter C. 2 pulse converter D. 12 pulse converter