Differentially compound D.C. motors can find applications requiring
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No-load speed of which of the following motor will be highest ?
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Which D.C. motor will be preferred for machine tools ?
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Which of the following application requires high starting torque ?
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The direction of rotation of a D.C. series motor can be changed by
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A DC Motor is driving a constant load torque having armature resistance of 0.15 Ω and armature current of 0.25 A having connected to a voltage of 230 V.
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In DC compound Motor the shunt field and series field winding is made up of _________ & ____________ respectively
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Q. A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 Ω and the field winding resistance is 80 Ω. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is
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Q. A 240v dc shunt motor with an armature resistance of 0.5 has a full load current of 40A. Find out the ratio of the stalling torque to the full load torque when a resistance of 1 ohm is connected in series with the armature
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If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is
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A d.c. shunt motor runs at 500 r.p.m. at 220 V. A resistance of 4.5 Ω is added in series with the armature for speed control
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Two series motors are mechanically coupled. One machine is run as a motor and the other as a generator. The iron and friction losses of the machines will be identical when
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