Computer Programming MCQs

If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?

A. Series motor
B. Shunt motor
C. Differentially compound motor
D. Cumulative compound motor

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Which D.C. motor will be preferred for machine tools ?

A. Series motor
B. Shunt motor
C. Cumulative compound motor
D. Differential compound motor

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Differentially compound D.C. motors can find applications requiring___________?

A. High starting torque
B. Low starting torque
C. Variable speed
D. Frequent on-off cycles

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Which D.C. motor is preferred for elevators ?

A. Shunt motor
B. Series motor
C. Differential compound motor
D. Cumulative compound motor

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According to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?

A. Current in the conductor aovtaat of conductor
C. Resultant force on conductor
D. None of the above

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If the field of a D.C. shunt motor gets opened while motor is running______________?

A. The speed of motor will be reduced %
B. The armature current will reduce
C. The motor will attain dangerously high speed 1
D. The motor will continue to nuvat constant speed

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Starters are used with D.C. motors because______________?

A. These motors have high starting torque
B. These motors are not self-starting
C. Back e.m.f. of these motors is zero initially
D. To restrict armature current as there is no back e.m.f. while starting

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In D.C. shunt motors as load is reduced__________________?

A. The speed will increase abruptly
B. The speed will increase in proportion to reduction in load
C. The speed will remain almost/constant
D. The speed will reduce

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A D.C. series motor is that which______________?

A. Has its field winding consisting of thick wire and less turns
B. Has a poor torque
C. Can be started easily without load
D. Has almost constant speed

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For starting a D.C. motor a starter is required because___________?

A. It limits the speed of the motor
B. It limits the starting current to a safe value
C. It starts the motor
D. None of the above

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