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ITI
Electrician
Electrician Set-1
DC Motors
10

DC Motors MCQ - Electrician (Set-1) with Answers

10) In a d.c. machine, a dummy coil is used to :

eliminate reactance voltage

eliminate armature reaction

create a mechanical balance in the armature

eliminate vibrations of the machine

Answer is:

create a mechanical balance in the armature

DC Motors MCQ - Electrician (Set-1) with Answers

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Related DC Motors MCQ - Electrician (Set-1) with Answers

11) The rotational speed of a d.c. shunt motor can be increased above its full speed by :

increasing the armature current

decreasing the armature current

increasing the field current

decreasing the field current

Answer is:

decreasing the field current

12) On increasing the load of a d.c. shunt motor, its speed will :

remain constant

increase proportionately

increase slightly

reduce slightly

Answer is:

reduce slightly

13) The armature current drawn by a d.c. motor is proportional to :

the applied e.m.f.

the torque required

the flux required

the speed of the motor

Answer is:

the torque required

14) The power written on the name plate of a d.c. motor is always :

the power drawn in kVa

the power drawn in kW

the output power available at the shaft

the gross power

Answer is:

the output power available at the shaft

DC Motors MCQ - Electrician (Set-1) with Answers

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