During rheostat braking of D.C. series motors_____________?
A. Motor is run as a generator
B. Motor is reversed in direction
C. Motor is run at reduced speed
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Hopkinson’s test on D.C. machines is conducted at_______________?
A. No-load
B. Part load
C. Full-load
D. Overload
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Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ?
A. Swinburne’s test
B. Hopkinson’s test
C. Field test
D. Brake test
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The purpose of retardation test on D.C. shunt machines is to find out____________?
A. Stray losses
B. Eddy current losses
C. Field copper losses
D. Windage losses
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D.C. generators are installed near the load centres to reduce_____________?
A. Iron losses
B. Line losses
C. Sparking
D. Corona losses
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In a D.C. generator, the iron losses mainly take place in___________/
A. Yoke
B. Commutator
C. Armature conductors
D. Armature rotor
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D.C. generators are normally designed for maximum efficiency around_____________?
A. Full-load
B. Rated r.p.m.
C. Rated voltage
D. All of the above
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The condition for maximum efficiency for a D.C. generator is______________?
A. Eddy current losses = stray losses
B. Hysteresis losses = eddy current losses
C. Copper losses = 0
D. Variable losses = constant losses
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The total losses in a well designed D.C. generator of 10 kW will be nearly______________?
A. 100 w
B. 500 w
C. 1000 w
D. 1500 w
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Which of the following losses are significantly reduced by laminating the core of a D.C. generator ?
A. Hysteresis losses
B. Eddy current losses
C. Copper losses
D. Windage losses
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Word of the Day
31 Aug
Hefty
large and heavy.
طاقتور، ہٹا کٹا، زبردست

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