Related Questions

In a separately excited generator supplying rated load the armature reaction:
A Is always present
B Is always absent
C May be sometimes present
D None of the above
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
A more
B less
C equal
D twice
Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?
A 1 hour
B 2 hours
C 6 hours
D 8 hours
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to
A reverse the field connections
B increase the field resistance
C increase the speed of primemover
D check armature insulation resistance
The series field of a short-shunt D.C. generator is excited by
A external current
B armature current
C shunt current
D load current
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
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
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
An alternator coupled to a _____ runs at slow speed, as compared to as compared to others.
A diesel engine
B hydraulic turbine
C steam turbine
D gas turbine
Rima was excited to begin her new job and we were impressed by her _____.
A aptitude
B melancholy
C experience
D eagerness

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