Electric Machine Design PART 17
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Attempt Free Electric Machine Design PART 17 Here. Read The Important Electrical MCQ From Below.
A. V = Eb + IaRa
B. Eb = V + IaRa
C. V = Eb/IaRa
D. V = Eb + Ia2Ra
E. None of the above
Answer
[2] Both Hopkinson’s test and Field test
B. Need two similar mechanically coupled motors
C. Use negligible power
D. Are regenerative tests
E. None of the above
Answer
[3] which of the following motor has the constant speed?
A. Series motor
B. Shunt motor
C. Cumulatively compound motor
D. All of the above
E. None of the above
Answer
Electric Machine Design PART 17
[4] The usual test to find the efficiency of the traction motor is
B. Retardation test
C. Hopkinson’s test
D. Swinburn’s test
E. None of the above
Answer
[5] A DC series motor is best for driving
A. Lathes
B. Cranes and hoists
C. Shears and punches
D. Machine tools
E. None of the above
Answer
[6] Retardation test on a dc shunt motor is used for finding
B. Copper loss
C. Friction loss
D. Iron loss
E. None of the above
Answer
[7] In a DC series motor increasing the load current will
A. Decrease the speed
B. Increase the speed
C. Better commutation
D. Increase the back emf
E. None of the above
Answer
Electric Machine Design PART 17
[8] One of the main advantage of the swinburn’s test is
A. It is applicable both shunt and compound motors
B. It needs one running test
C. It is very economical and convenient
D. It ignores any charge in iron loss
E. None of the above
Answer
[9] the main disadvantage of hopkinson’s test for finding efficiency of shunt dc motors is that it
A. Requires full load power
B. Ignores any change in iron loss
C. Needs one motor and one generator
D. Requires two identical shunt machines
E. None of the above
Answer
[10] The most economical method of finding no losses of a large dc shunt motor is
A. Hopkinson’s test
B. Swinburn’s test
C. Retardation test
D. Field’s test
E. None of the above
Answer
Electric Machine Design PART 17
