1000+ Industrial Drives Objective Questions and Answers Pdf - 1

Question: 1

While selecting motor for an air conditioner which of the following characteristics is of great importance?

(A) arrangement for power transmission

(B) noise

(C) type of enclosure

(D) type of bearings

Ans: B

noise

Question: 2

In which of the following applications variable speed operation is preferred?

(A) refrigerator

(B) water pump

(C) exhaust fan

(D) ceiling fan

Ans: D

ceiling fan

Question: 3

Flame proof motors are used in

(A) explosive atmosphere

(B) moist atmospheres

(C) steel mills

(D) paper mils

Ans: A

explosive atmosphere

Question: 4

In ______ method of starting three phase induction motors the starting voltage is not reduced.

(A) slip ring

(B) start delta

(C) auto-transformer

(D) any of the above

Ans: A

slip ring

Question: 5

_____ is preferred for synthetic fibre mills.

(A) Shunt motor

(B) Series motor

(C) Reluctance motor

(D) Synchronous motor

Ans: C

Reluctance motor

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