The direction of rotation of a D.C. series motor can be changed by?

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The direction of rotation of a D.C. series motor can be changed by?

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asked Mar 20, 2018 by anonymous

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The speed of a D.C. motor can be controlled by varying

The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
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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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The speed of a D.C. shunt motor can be increased by?

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As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent...

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The armature voltage control of D.C. motor provides?

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The armature torque of the D.C. shunt motor is proportional to?

Last Answer : The armature torque of the D.C. shunt motor is proportional to armature current.

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asked Mar 20, 2018 by anonymous

As the load is increased the speed of D.C. shunt motor will?

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In a differentially compounded D.C. motor, if shunt field suddenly opens?

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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?

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Sparking, is discouraged in a D.C. motor because?

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Which D.C. motor is generally preferred for cranes and hoists ?

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The condition for maximum power in case of D.C. motor is?

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

Last Answer : Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.

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

Last Answer : If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses.

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

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asked Mar 20, 2018 by anonymous

anonymous · Answer 1 · 2018-03-20T19:57:09+0000

The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

The direction of rotation of a D.C. series motor can be changed by?

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