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Electrical and Electronics Engineering MCQs | Page - 25

Dear candidates you will find MCQ questions of Electrical and Electronics Engineering here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

M

Mr. Dubey • 51.43K Points
Coach

Q. 241) The relative speed between stator flux and rotor is equal to

(A) synchronous speed , ns
(B) rotor speed n
(C) zero
(D) ns - n
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M

Mr. Dubey • 51.43K Points
Coach

Q. 242) Two of the supply terminals to a 3-phase induction motor get interchanged during reconnection after normal maintenance. When switched on to supply, the motor will

(A) rotate in the same direction as before maintenance.
(B) rotate in a direction opposite to that before maintenance.
(C) not start at all.
(D) get heated and damaged.
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M

Mr. Dubey • 51.43K Points
Coach

Q. 243) The direction of rotation of a 3-phase induction motor can be reversed by

(A) interchanging any two leads from supply.
(B) interchanging any two leads from slip-rings.
(C) interchanging all the three leads from the supply
(D) disconnecting any one phase
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M

Mr. Dubey • 51.43K Points
Coach

Q. 244) The speed of rotor of an induction motor is always ………………… synchronous speed.

(A) equal to
(B) more than
(C) less than
(D) half of
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M

Mr. Dubey • 51.43K Points
Coach

Q. 245) Synchronous speed is defined as the speed at which the

(A) stator magnetic field rotates.
(B) rotor rotates on no-load.
(C) rotor rotates on full load.
(D) none of the above.
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M

Mr. Dubey • 51.43K Points
Coach

Q. 246) A 3-phase, 4-pole induction motor has a no-load slip of 2% when connnected to a 25 Hz source, the no-load speed in rpm is

(A) 730
(B) 735
(C) 765
(D) 1430
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M

Mr. Dubey • 51.43K Points
Coach

Q. 247) A 4-pole, 3-phase induction motor is running at 4 percent slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

(A) 16hz
(B) 25hz
(C) 16
(D) 20
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M

Mr. Dubey • 51.43K Points
Coach

Q. 248) The speed of rotating field due to rotor currents relative to rotor surface in an induction motor is

(A) n
(B) s.n
(C) ns
(D) s.ns
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M

Mr. Dubey • 51.43K Points
Coach

Q. 249) The speed of rotating field due to rotor currents relative to stator core in an induction motor is

(A) s
(B) ns
(C) sn
(D) sns
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M

Mr. Dubey • 51.43K Points
Coach

Q. 250) When three phase induction motor is started with star-delta starter, during starting stator is connected

(A) in star
(B) in delta
(C) in star or delta
(D) none of these
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