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

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b rated full-load current

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cless than full-load current

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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

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barmature drop is negligible

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cflux is proportional to armature current

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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

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bThe motor will continue to run

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cThe armature may burn

✓


dThe motor will run noisy

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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

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c up to 15 H.P

✖


dup to 20 H.P

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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

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dinversely proportional to the armature current

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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

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cdecreasing the armature current

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d increasing the armature current

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


a more than the normal speed

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b loss than the normal speed

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cnormal speed

✓


dzero

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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

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cany of the above method

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dnone of the above method

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View Answer Ward Leonard control

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


arun at normal speed

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bnot run

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crun at lower speed

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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

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bseries motor

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cdifferential compoutid D.C. motor

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dcumulative compound D.C. motor

✓



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