Related Questions

A pilot exciter is provided on generators for which of the following reasons ?
A To excite the poles of main exciter
B To provide requisite starting torque to main exciter
C To provide requisite starting torque to generator
D None of the above
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
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 turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
A Exit nozzle, which is a constant volume process
B Exit nozzle, which is essentially an isentropic process
C Turbine blades, which is a constant volume process
D Turbine blades, which is essentially an isentropic process
Which of the following methods is used for air cooling of turbo-alternators ?
A One sided axial ventilation
B Two sided axial ventilation
C Multiple inlet system
D All of the above
Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto
A 10 MW
B 30 MW
C 60 MW
D 150 MW
The capacity of large turbo-generators varies from
A 20 to 100 MW
B 50 to 300 MW
C 70 to 400 MW
D 100 to 650 MW
In turbo fan engine, the jet velocity as compared to turbojet engine is
A Less
B More
C Same
D May be less or more depending upon speed

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