Rectifiers And Converters MCQ Questions & Answers

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To produce cathode spot in a mercury arc rectifier

A) anode is heated B) tube is evacuated C) an auxiliary electrode is used D) low mercury vapour pressures are used

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

A synchronous converter can be started

A) by means of a small auxiliary motor B) from A.C. side as induction motor C) from D.C. side as D.C. motor D) any of the above methods

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Answer & Solution

Answer: Option D

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In a single phase rotary converter the number of slip rings will be

A) two B) three C) four D) six

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Answer & Solution

Answer: Option A

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Which of the following rectifiers have been used extensively in supplying direct current for electroplating?

A) Copper oxide rectifiers B) Selenium rectifiers C) Mercury arc rectifiers D) Mechanical rectifiers E) None of the above

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Answer & Solution

Answer: Option B

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In a three-phase mercury arc rectifiers each anode conducts for

A) One-third of a cycle B) One-fourth of a cycle C) One-half a cycle D) Two-third of a cycle

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Answer & Solution

Answer: Option A

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Ageing of a selenium rectifier may change the output voltage by

A) 5 to 10 per cent B) 15 to 20 per cent C) 25 to 30 per cent D) none of the above

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Answer & Solution

Answer: Option A

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In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

A) same B) less C) double D) three times

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Answer & Solution

Answer: Option B

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Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?

A) Mechanical rectifiers B) Copper oxide rectifiers C) Selenium rectifiers D) Electrolytic rectifiers

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Answer & Solution

Answer: Option D

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The efficiency of the copper oxide rectifier seldom exceeds

A) 90 to 95% B) 85 to 90% C) 80 to 85% D) 65 to 75%

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Answer & Solution

Answer: Option D

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A rotary converter combines the function of

A) An induction motor and a D.C. generator B) A synchronous motor and a D.C. generator C) A D.C. series motor and a D.C. generator D) None of the above

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Answer & Solution

Answer: Option B

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Rectifiers And Converters MCQ Questions & Answers | Electrical Engineering