DC MOTORS QUIZ

In a dc motor if the back emf is absent

Motor will run at very high speed

Motor will burn

Motor will not run at all

Motor will run at very slow speed

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The main disadvantage of the Ward-Leonard control method is

High maintenance cost

Low efficiency at high loads

All of these

High initial cost

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Differentially compound D.C. motors can find applications requiring

Variable speed

Frequent on-off cycles

Low starting torque

High starting torque

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No load speed of which of the following motor will be highest?

Differentially compounded motor

Series motor

Cummulative compounded motor

Shunt motor

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A compensating winding is an auxiliary winding embedded in slots in

Partly in pole faces, partly in armature

The armature

None of the listed here

The pole faces of main poles

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In D.C. shunt motors as load is reduced

The speed will increase in proportion to reduction in load

The speed will remain almost/constant

The speed will increase abruptly

The speed will reduce

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The compensating winding is connected in

Parallel with armature

Series with armature

Series-parallel with armature

None of the listed here

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If conditions for maximum power for a dc motor are established, the efficiency of the motor will be

Less than 50%

80 to 90 %

100 %

60 to 70 %

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Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

Under compounded

Cumulatively compounded

Differentially compounded

Level compounded

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A dc series motor is most suitable for

Lathes

Pump

Cranes

Punch presses

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