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M

Mr. Dubey • 51.17K Points
Coach

Q. 71) 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
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Mr. Dubey • 51.17K Points
Coach

Q. 72) 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
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Mr. Dubey • 51.17K Points
Coach

Q. 73) 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
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Mr. Dubey • 51.17K Points
Coach

Q. 74) 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
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Mr. Dubey • 51.17K Points
Coach

Q. 75) Permeance is the reciprocal of

(A) flux density
(B) reluctance
(C) ampere-turns
(D) resistance
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Mr. Dubey • 51.17K Points
Coach

Q. 76) 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.
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Mr. Dubey • 51.17K Points
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Q. 77) 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
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Mr. Dubey • 51.17K Points
Coach

Q. 78) In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except

(A) interpoles
(B) dummy coils
(C) compensating winding
(D) shifting of axis of brushes
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Mr. Dubey • 51.17K Points
Coach

Q. 79) In D.C. generators on no-load, the air gap flux distribution in space is

(A) sinusoidal
(B) triangular
(C) pulsating
(D) flat topped
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Mr. Dubey • 51.17K Points
Coach

Q. 80) The purpose of providing dummy coils in a generator is

(A) to reduce eddy current losses
(B) to enhance flux density
(C) to amplify voltage
(D) to provide mechanical balance for the rotor
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