Electrical Engineering Objective Questions { DC Motors }

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337. 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 of the armature

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338. D.C. series generator is used

A. to supply traction load

B. to supply inductrial load at constant voltage

C. as a booster to maintain constant voltage at the load end of the feeder

D. for none of the above purpose

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339. 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

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340. 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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341. D.C. generator generally preferred for charging automobiles batteries is

A. series generator

B. shunt generator

C. long shunt compound generator

D. any of the above

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342. 1n 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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343. Permeance is the reciprocal of

A. flux density

C. ampere-turns

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