Electrical Engineering MCQs

Page No. 288

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this______________?


a series motor


bshunt motor


ccompound motor


d any of the above


View Answer compound motor

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?


a series motor


bshunt motor


ccompound motor


dany of the above


View Answer series motor

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens____________?


athis will make armature to take heavy current, possibly burning it


bthis will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses


cnothing will happen to motor


dmotor will come to stop



Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?


adrum type controller is used


bthree point starter is used


cfour point starter is used


d all above can be used



When the armature of a D.C. motor rotates, e.m.f. induced is___________?


aself-induced e.m.f.


bmutually induced e.m.f.


cback e.m.f


dnone of the above


View Answer back e.m.f

In variable speed motor___________?


aa stronger commutating field is needed at low speed than at high speed


ba weaker commutating field is needed at low speed than at high speed


csame commutating field is needed at low speed than at high speed


dnone of the above is correct



Which method of braking is generally used in elevators ?


aPlugging


bRegenerative braking


cRheostatic braking


dNone of the above


View Answer Plugging

For which types of D.C. motor, dynamic braking is generally used ?


aShunt motors


b Series motors


cCompound motors


dAll of the above


View Answer All of the above

During rheostat braking of D.C. series motors_____________?


amotor is run as a generator


bmotor is reversed in direction


cmotor is run at reduced speed


d None of these



Hopkinson’s test on D.C. machines is conducted at_______________?


ano-load


bpart load


c full-load


doverload


View Answer full-load

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