Related Questions

Losses which occur in rotating electric machines and do not occur in trans formers are
A friction and windage losses
B magnetic losses
C hysteresis and eddy current losses
D copper losses
Of the 120 households in an area, 55 have cars, 35 have motor bikes, and 20 have both cars and motor bikes. How many of the households in the area have neither cares nor motor bikes?
A 110
B 90
C 50
D 30
A motor pool has 300 vehicles of which 30% are trucks. 20% of all the vehicles in the motor pool are diesel, including 15 trucks. What percent of the motor pool is composed of vehicles that are neither trucks nor diesel?
A 165%
B 90%
C 65%
D 10%
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
A Frame
B Shaft
C Commutator
D Stator
One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven
A Runs as a generator
B Does not run as a generator
C Also runs as a motor comes to stop after sometime
D None of these
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be
A Level compounded
B Under compounded
C Cumulatively compounded
D Differentially compounded
A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above
Iron losses in a D.C. machine are independent of variations in
A Speed
B Load
C Voltage
D Speed and voltage
In a D.C. generator all of the following could be the effects of iron losses except
A Loss of efficiency
B Excessive heating of core
C Increase in terminal voltage
D Rise in temperature of ventilating air
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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