Questions and answers for exam Preparation

MCQs

Total Questions : 377 | Page 35 of 38 pages

Question 341. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when_______________?

there is no load on|he generator
the generator runs on full load
the generator runs on overload
the generator runs on designed speed

Discuss Question

Answer: Option A. -> there is no load on|he generator
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 342. 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______________?

interpoles
dummy coils
compensating winding
shifting of axis of brushes

Discuss Question

Answer: Option B. -> dummy coils
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 343. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?

will be zero
will be of 5 Hz
will be of 5 xiVHz
will be of v Hz 5

Discuss Question

Answer: Option B. -> will be of 5 Hz
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 344. In D.C. generators on no-load, the air gap flux distribution in space is______________?

sinusoidal
triangular
pulsating
flat topped

Discuss Question

Answer: Option D. -> flat topped
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 345. The purpose of providing dummy coils in a generator is____________?

to reduce eddy current losses
to enhance flux density
to amplify voltage
to provide mechanical balance for the rotor

Discuss Question

Answer: Option D. -> to provide mechanical balance for the rotor
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 346. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly_______________?