Power Electronics MCQ Questions & Answers

81

Which of the following is correct for inverters?

A) VSI and CSI both require feedback diodes B) Only CSI requires feedback diodes C) GTOs can be used in CSI D) Only VSI requires feedback diodes

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Answer & Solution

Answer: Option D

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82

Which one of the following statements regarding the two transistor model of the p-n-p-n four layer device is correct?

A) It explains only the turn ON portion of the device characteristic B) It explains only the turn OFF portion of the device characteristic C) It explains only the negative region portion of the device characteristic D) It explains all the region of the device characteristics

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Answer & Solution

Answer: Option D

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83

An SCR combines the features of . . . . . . . .

A) A rectifier and resistance B) A rectifier and transistor C) A rectifier and capacitor D) None of the above

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Answer & Solution

Answer: Option B

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84

The duty cycle of a pulse of width 2 microsecond and repetition frequency 4 kHz is

A) 0.5 B) 0.06 C) 0.008 D) 0.8

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Answer & Solution

Answer: Option C

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85

Which semiconductor device behaves like two SCRs?

A) UJT B) Triac C) JFET D) MOSFET

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Answer & Solution

Answer: Option B

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86

The number of terminals present in IGBT is

A) 2 B) 3 C) 4 D) 5

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Answer & Solution

Answer: Option B

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87

From circuit design simplicity and economy point of view, one of the following configurations for a converter is the best. Which is that?

A) Push-pull DC-DC converter using one transformer B) Ringing choke converter C) Push-pull converter using two transformers D) None of these

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Answer & Solution

Answer: Option B

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88

Which of the following device used for high frequency applications?

A) Diac B) Triac C) SCR D) BJT

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Answer & Solution

Answer: Option C

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89

An SCR can be switched from a non-conducting state to a conducting state by applying
1. A voltage with high $$\frac{{{\text{dv}}}}{{{\text{dt}}}}$$
2. Voltage greater than forward break over voltage
3. Negative gate current with positive anode voltage
4. Positive gate current with positive anode voltage
Which of the following is correct?

A) 1, 2 and 3 are correct B) 2, 3 and 4 are correct C) 1, 2 and 4 are correct D) 1 and 4 are correct

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Answer & Solution

Answer: Option C

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90

A TRIAC is similar to

A) two parallel connected thyristors B) two back to back (anti-parallel) connected thyristors C) Thyristors with larger $$\frac{{{\text{dv}}}}{{{\text{dt}}}}$$ rating D) Bipolar Junction Transistor

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Answer & Solution

Answer: Option B

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Power Electronics MCQ Questions & Answers | ECE