The e.m.f. generated in a D.C. generator is directly proportional to____________?

A. Flux/pole
B. Speed of armature
C. Number of poles
D. All of the above

In D.C. generators the polarity of the interpoles_____________?

A. Is the same as that of the main pole ahead
B. Is the same as that of the immediately preceding pole
C. Is opposite to that of the main pole ahead
D. Is neutral as these poles do not play part in generating e.m.f.

Permeance is the reciprocal of______________?

A. Flux density
B. Reluctance
C. Ampere-turns
D. Resistance

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?

A. R.p.m. is more than 300
B. R.p.m. is less than 300
C. Number of poles is 4
D. Number of poles is 2

D.C. generator generally preferred for charging automobile batteries is______________?

A. Series generator
B. Shunt generator
C. Long shunt compound generator
D. Any of’the above

Interpole flux should be sufficient to_____________?

A. Neutralise the commutating self induced e.m.f.
B. Neutralise the armature reaction flux
C. Neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
D. Perform none of the above functions

Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?

A. Series generator
B. Shunt generator
C. Compound generator
D. Self-excited generator

D.C. series generator is used_________________?

A. To supply traction load
B. To supply industrial load at constant voltage
C. Voltage at the toad end of the feeder
D. For none of the above purpose

For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?

A. Voltage of the incoming generator should be same as that of bus bar
B. Polarity of incoming generator should be same as that of bus bar
C. All the series fields should be run in parallel by means of equilizer connection
D. Series fields of all generators should be either on positive side or negative side of the armature

Open circuited armature coil of a D.C. machine is________________?

A. Identified by the scarring of the commutator segment to which open circuited coil is connected
B. Indicated by a spark completely around the commutator
C. Both a. and (b)
D. None of the above