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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