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DC Motors

DC Motors
The speed of a series motor at no load is

2000 rpm
4000 rpm
Infinity
1000 rpm

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DC Motors
Which of the following application requires high starting torque?

Centrifugal pump
Locomotive
Lathe machine
Air blower

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DC Motors
Motor starter are essential for

Preventing fuse blowing
Avoiding excessive starting current
Starting the motor
Accelerating the motor

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DC Motors
D.C. series motors are used

Where load is constant
None of these
Where load changes frequently
Where constant operating speed is needed

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DC Motors
Which motor has the poorest speed control?

Shunt motor
Series motor
Cummulative compounded motor
Differentially compounded motor

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DC Motors
When the armature of a D.C. motor rotates, e.m.f. induced is

Self-induced e.m.f.
Mutually induced e.m.f.
Back e.m.f.
None of these

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