Multiple Choice Questions and Answers on Power Electronics
Multiple Choice Questions and Answers on Power Electronics
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- Question Bank in Electronics & Communication Engineering by Prem R Chadha
- A Handbook on Electronics Engineering – Illustrated Formulae & Key Theory Concepts
Q1. A Triac has three terminals viz ………………
- Drain, source, gate
- Two main terminal and a gate terminal
- Cathode, anode, gate
- None of the above
Answer : 2
Q2. A triac is equivalent to two SCRs …………..
- In parallel
- In series
- In inverse-parallel
- None of the above
Answer : 3
Q3. A triac is a …………. switch
- Bidirectional
- Unidirectional
- Mechanical
- None of the above
Answer : 1
Q4. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ………………. in its first quadrant
- Transistor
- SCR
- UJT
- none of the above
Answer : 2
Q5. A triac can pass a portion of …………… half-cycle through the load
- Only positive
- Only negative
- Both positive and negative
- None of the above
Answer : 3
Q6. A diac has ………….. terminals
- Two
- Three
- Four
- None of the above
Answer : 1
Q7. A triac has …………….. semiconductor layers
- Two
- Three
- Four
- Five
Answer : 3
Q8. A diac has …………… pn junctions
- Four
- Two
- Three
- None of the above
Answer : 2
Q9. The device that does not have the gate terminal is ……………….
- Triac
- FET
- SCR
- Diac
Answer : 4
Q10. A diac has ……………… semiconductor layers
- Three
- Two
- Four
- None of the above
Answer : 1
Q11. A UJT has ……………….
- Two pn junctions
- One pn junction
- Three pn junctions
- None of the above
Answer : 2
Q12. The normal way to turn on a diac is by ………………..
- Gate current
- Gate voltage
- Breakover voltage
- None of the above
Answer : 3
Q13. A diac is …………………. switch
- An c.
- A d.c.
- A mechanical
- None of the above
Answer : 1
Q14. In a UJT, the p-type emitter is ……………. doped
- Lightly
- Heavily
- Moderately
- None of the above
Answer : 2
Q15. Power electronics essentially deals with control of a.c. power at …………
- Frequencies above 20 kHz
- Frequencies above 1000 kHz
- Frequencies less than 10 Hz
- 50 Hz frequency
Answer : 4
Q16. When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ………………..
- High
- Low
- Extremely low
- None of the above
Answer : 1
Q17. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal …………….
- Remains the same
- Is decreased
- Is increased
- None of the above
Answer : 2
Q18. To turn on UJT, the forward bias on the emitter diode should be …………… the peak point voltage
- Less than
- Equal to
- More than
- None of the above
Answer : 3
Q19. A UJT is sometimes called …………. diode
- Low resistance
- High resistance
- Single-base
- Double-base
Answer : 4
Q20. When the temperature increases, the inter-base resistance (RBB) of a UJT ………….
- Increases
- Decreases
- Remains the same
- None of the above
Answer : 1
Q21. This question will be available soon
Q22. When the temperature increases, the intrinsic stand off ratio ……….
- Increases
- Decreases
- Essentially remains the same
- None of the above
Answer : 3
Q23. Between the peak point and the valley point of UJT emitter characteristics we have ………….. region
- Saturation
- Negative resistance
- Cut-off
- None of the above
Answer : 2
Q24. A diac is turned on by …………………
- A breakover voltage
- Gate voltage
- Gate current
- None of the above
Answer : 1
Q25. The device that exhibits negative resistance region is ………………..
- Diac
- Triac
- Transistor
- UJT
Answer : 4
Q26. The UJT may be used as ……………….
- Am amplifier
- A sawtooth generator
- A rectifier
- None of the above
Answer : 2
Q27. A diac is simply ………………
- A single junction device
- A three junction device
- A triac without gate terminal
- None of the above
Answer : 3
Q28. After peak point, the UJT operates in the ……………. region
- Cut-off
- Saturation
- Negative resistance
- None of the above
Answer : 3
Q29. Which of the following is not a characteristic of UJT?
- Intrinsic stand off ratio
- Negative resistance
- Peak-point voltage
- Bilateral conduction
Answer : 4
Q30. The triac is …………….
- Like a bidirectional SCR
- A four-terminal device
- Not a thyristor
- Answers (1) and (2)
Answer : 1
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