Which of the following losses are significantly reduced by laminating the core of a D.C. generator?
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Electrical Engineering · all questionsD.C. Motors
D.C. Motors
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In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
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The direction of rotation of a D.C. series motor can be changed by
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Which motor has the poorest speed control?
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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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If the supply voltage for a D.C. motor is increased, which of the following will decrease?
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Differentially compound D.C. motors can find applications requiring
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At the instant of starting when a D.C. motor is put on supply, it behaves like
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For the same H.P. rating and full load speed, following motor has poor starting torque
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Which D.C. motor is generally preferred for cranes and hoists?
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The armature torque of the D.C. shunt motor is proportional to
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What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
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If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens
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If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens
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The main disadvantage of the Ward-Leonard control method is
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D.C. series motors are used
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Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
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Three point starter can be used for
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These days D.C. motors are widely used in
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Q100
Open questionIn D.C. shunt motors as load is reduced
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