DC Motors Quiz Set 1 in English

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Created by Surendra

DC Motors Quiz in English Set 1

All Important Question Answers for Electrician Related Exams

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Three point starter can be used for

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A three point starter is considered suitable for

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Sparking is discouraged in a D.C. motor because

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Which of the following method of speed control of D.C. machine will offer minimum efficiency ?

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In a D.C. shunt motor speed is

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In D.C. machines fractional pitch winding is used

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can be obtained by

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Starters are used with D.C. motors because

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When two D.C. series motors are connected in parallel the resultant speed is

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If a D.C. motor is connected across the A.C. supply it will

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

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The ratio of starting torque to full-load torque is least in case of

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A direct on line starter is used: for starting motors

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Speed control by Ward Leonard method gives uniform speed variation

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Which of the following motor is preferred for operation in highly explosive atmosphere ?

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Sparking at the commutator of a D.C. motor may result in

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What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

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In case the back e.m.f. and the speed of a D.C. motor are doubled the torque developed by the motor will

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If the speed of a D.C. shunt motor is increased the back e.m.f. of the motor will

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A D.C. series motor is that which

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Which of the following motors one will choose to drive the rotary compressor ?

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In which of the following applications D.C. series motor is invariably tried?

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These days D.C. motors are widely used in

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In case of D.C. shunt motors the speed is dependent on back e.m.f. only because

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Usually wide and sensitive speed control is desired in case of

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