D.C. Motors Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on “Study of D.C. Motors Mcqs”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate D.C. Motors Mcqs comprehensively.

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31.
In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?

100%

Around 90%

Anywhere between 75% and 90%

Less than 50%

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32.
The ratio of starting torque to full-load torque is least in case of____________?

Series motors

Shunt motors

Compound motors

None of the above

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33.
In D.C. motor which of the following can sustain the maximum temperature rise?

Slip rings

Commutator

Field winding

Armature winding

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34.
Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?

Lenz’s law

Faraday’s law

Coloumb’s law

Fleming’s left-hand rule

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35.
Which of the following load normally needs starting torque more than the rated torque?

Blowers

Conveyors

Air compressors

Centrifugal pumps

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36.
The starting resistance of a D.C. motor is generally_______________?

Low

Around 500 Q

1000 Q

Infinitely large

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37.
The speed of a D.C. series motor is_____________?

Proportional to the armature current

Proportional to the square of the armature current

Proportional to field current

Inversely proportional to the armature current

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38.
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

100% of the previous value

50% of the previous value

25% of the previous value

10% of the previous value

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39.
The current drawn by the armature of D.C. motor is directly proportional to__________?

The torque required

The speed of the motor

The voltage across the terminals

None of the above

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40.
The power mentioned on the name plate of an electric motor indicates____________?

The power drawn in kW

The power drawn in kVA

The gross power

The output power available at the shaft

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41.
Which D.C. motor has got maximum self loading property?

Series motor

Shunt motor

Cumulatively compounded ‘motor

Differentially compounded motor

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42.
Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?

Series motor

Shunt motor

Cumulatively compounded motor

Differentially compounded motor

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43.
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?

Nothing will happen to the motor

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

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

motor will run at very slow speed

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44.
D.C. series motors are used______________?

Where load is constant

Where load changes frequently

Where constant operating speed is needed

In none of the above situations

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45.
For the same H.P. rating and full load speed, following motor has poor starting torque_____________?

Shunt

Series

Differentially compounded

Cumulativelyc’ompounded

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