Electrical Engineering MCQs

Page No. 297

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?


a almost negligible


b rated full-load current


cless than full-load current


dmore than full-load current



In case of D.C. shunt motors the speed is dependent on back e.m.f. only because____________?


aback e.m.f. is equal to armature drop


barmature drop is negligible


cflux is proportional to armature current


dflux is practically constant in D:C. shunt motors



What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?


aThe motor will stop


bThe motor will continue to run


cThe armature may burn


dThe motor will run noisy


View Answer The armature may burn

A direct on line starter is used: for starting motors___________?


aup to 5 H.P


bup to 10 H.P


c up to 15 H.P


dup to 20 H.P


View Answer up to 5 H.P

In a D.C. shunt motor, speed is______________?


aindependent of armature current


bdirectly proportional to the armature current


cproportional to the square of the current


dinversely proportional to the armature current



The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?


adecreasing the field current


bincreasing the field current


cdecreasing the armature current


d increasing the armature current



When two D.C. series motors are connected in parallel, the resultant speed is____________?


a more than the normal speed


b loss than the normal speed


cnormal speed


dzero


View Answer normal speed

To get the speed of D.C, motor below the normal without wastage of electrical energy is used?


aWard Leonard control


brheostatic control


cany of the above method


dnone of the above method


View Answer Ward Leonard control

If a D.C. motor is connected across the A.C. supply it will_______________?


arun at normal speed


bnot run


crun at lower speed


dburn due to heat produced in the field winding by .eddy currents



The type of D.C. motor used for shears and punches is_____________?


ashunt motor


bseries motor


cdifferential compoutid D.C. motor


dcumulative compound D.C. motor



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