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Electrical Drives and Controls (EDC) MCQs | Page - 20

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M

Mr. Dubey • 51.43K Points
Coach 

Q. 191) Which of the following is the plugging method of braking?

(A) reversal of field connections
(B) reversal of armature connections
(C) addition of equal and opposite field
(D) removal of field circuit from current machine circuit
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 192) What will happen if DC shunt motor is connected across AC supply?

(A) will run at normal speed
(B) will not run
(C) will run at lower speed
(D) burn due to heat produced in the field winding
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 193) What will happen, with the increase in speed of a DC motor?

(A) back emf increase but line current falls.
(B) back emf falls and line current increase.
(C) both back emf as well as line current increase.
(D) both back emf as well as line current fall.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 194) At a very low speed, increase in field resistance will

(A) decrease the speed of motor
(B) increase the speed of motor
(C) not have signicant effect on speed
(D) no effect
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 195) Small DC motors have best speed control by

(A) armature voltage control
(B) field resistance control
(C) any of the methods
(D) none of the mentioned
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 196) To implement armature voltage control, it must be ensured that

(A) it is used on separately excited machine
(B) it is used on shunt machine
(C) it is used on series machine
(D) any of the mentioned machine
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 197) Run-away for large DC machine is avoided by using

(A) a turn or two of cumulative compounding
(B) compensating winding
(C) stablizer winding
(D) all of the mentioned
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 198) Why does DC motor sometimes run too fast when under-loaded?

(A) due to weak field
(B) due to high line voltage
(C) due to brush-shifted to neutral
(D) all of the mentioned
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 199) DC machines have                  windings and synchronous machines use              windings.

(A) closed,open
(B) open, closed
(C) open, open
(D) closed, closed
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 200) The commutator pitch for a simplex lap winding is equal to

(A) 1 and -1
(B) 1
(C) -1
(D) 2 to -2
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Electrical Drives and Controls (EDC) MCQs Set 1

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Electrical Drives and Controls (EDC) MCQs Set 20

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Electrical Drives and Controls (EDC) MCQs Set 22

Electrical Drives and Controls (EDC) MCQs Set 23

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