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Mr. Dubey • 51.43K Points
Coach

Q. 21) When is the skein winding made use of?

(A) when small amount of relatively small size wire is used

(B) when large amount of relatively small size wire is used

(D) when small amount of relatively large size wire is used

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Correct answer:
Option (A) - when small amount of relatively small size wire is used

Explanation:

 skein winding is one of the 3 kinds of single phase windings used. it is used when small amount of relatively small size wire is used.

Mr. Dubey • 51.43K Points
Coach

Q. 22) winding made use of?

(A) maximum horse power single phase induction motor

(B) fractional horse power single phase induction motor

(D) zero horse power single phase induction motor

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Correct answer:
Option (B) - fractional horse power single phase induction motor

Explanation:

 the skein winding is one of the 3 kinds of single phase induction motor. the skein winding is used when fractional horse power single phase induction motor is used.

Mr. Dubey • 51.43K Points
Coach

Q. 23) Which winding is mostly used winding in the single phase induction motor?

(A) circular winding

(B) concentric winding

(D) skein winding

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Correct answer:
Option (B) - concentric winding

Explanation:

 the concentric winding is the most widely used winding. it is also the most flexible winding of the windings used in the single phase induction motor.

Mr. Dubey • 51.43K Points
Coach

Q. 24) What is/are the advantages of the skein winding?

(A) low cost to wind

(B) low cost to insert

(D) low cost to wind, low cost to insert, permits some freedom of choice of distribution

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Correct answer:
Option (D) - low cost to wind, low cost to insert, permits some freedom of choice of distribution

Explanation:

 the skein winding is the low cost to wind and to insert. it also permits some freedom of choice of distribution.

Mr. Dubey • 51.43K Points
Coach

Q. 25) What material is used in the tunnel of the rotor of the single phase induction motor?

(A) aluminium

(B) copper

(D) wood

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Correct answer:
Option (A) - aluminium

Explanation:

 the rotor consists of a block of slotted laminations. the slots form a series of tunnels that are filled with aluminium in its molten state.

Mr. Dubey • 51.43K Points
Coach

Q. 26) A dc machine is run at rated speed in forward direction and then in backward direction. It is observed that, speeds of the rotation are different, then it leads to the conclusion of

(A) incorrect brush placement

(B) incorrect pole and core alignment

(D) all of the mentioned

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Correct answer:
Option (A) - incorrect brush placement

Explanation:

 given at the same speed of operation, if the speeds are different then the brushes are placed in not aligned manner.

Mr. Dubey • 51.43K Points
Coach

Q. 27) For a dc machine, its commutator has a diameter of 50 c rotating at 1000 rpm. For a brush width of 1 cm, the time commutation taken by the machine will be

(A) 0.382 ms

(B) 0.456 ms

(D) 0.312 ms

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Correct answer:
Option (A) - 0.382 ms

Explanation:

 time of commutation = brush width/peripheral velocity

Mr. Dubey • 51.43K Points
Coach

Q. 28) An induction motor can be said analogous to

(A) transformer

(B) synchronous motor

(D) stepper motor

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Correct answer:
Option (A) - transformer

Explanation:

 an induction motor has similar operation as a transformer.

Mr. Dubey • 51.43K Points
Coach

Q. 29) A 3-phase induction motor with its rotor blocked behaves similar to a

(A) transformer under short circuit of secondary terminals

(B) transformer under open circuit of secondary

(D) synchronous motor under open circuit

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Correct answer:
Option (A) - transformer under short circuit of secondary terminals

Explanation:

 it is analogous to transformer under the shorted terminals of the secondary.

Mr. Dubey • 51.43K Points
Coach

Q. 30) No load current in induction motor is 10- 20% of full load current and the no load current of transformer is 2-6%.

(A) true

(B) false

(D) ---

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Correct answer:
Option (A) - true

Explanation:

 the air gap in induction motor is more prominent than transformer and so the flux requirement will also be more.

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Electrical Drives and Controls (EDC) MCQs Set 21

Electrical Drives and Controls (EDC) MCQs Set 22

Electrical Drives and Controls (EDC) MCQs Set 23

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