Related Questions

The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator?
A Hysteresis loss
B Field copper loss
C Armature copper loss
D Eddy current loss
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
At Uttara High school each student studies exactly one foreign languages. Three-fifth of the students take Spanish and one-fourth of the remaining students take take German. If all of the others take French, What percent of the students take French?
A 10
B 30
C 20
D 25
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
The e.m.f. generated by a shunt wound D.C. generator is E. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
A $$\frac{{\text{E}}}{2}$$
B 2E
C Slightly less than E
D E
A separately excited generator as compared to a self-excited generator
A Is amenable to better voltage control
B Is more stable
C Has exciting current independent of load current
D Has all above features
Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator?
A Dummy coils
B Commutator
C Eye bolt
D Equalizer rings
Iron losses in a D.C. machine are independent of variations in
A Speed
B Load
C Voltage
D Speed and voltage
In the D.C. motor the iron losses occur in
A The field
B The armature
C The brushes
D The commutator
During short circuit test iron losses are negligible because
A the current on secondary side is negligible
B the voltage on secondary side does not vary
C the voltage applied on primary side is low
D full-load current is not supplied to the transformer

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