EXAMIANS
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.
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Maximum allowable moisture content of power transformer insulating oil is generally taken as
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In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?
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For successful parallel operation of two single phase transformers, the most essential condition is that their
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Which of the following machine will have maximum efficiency?
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A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is
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The noise resulting from vibrations of lamination set by magnetic forces, is termed as
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Transformer action requires a
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Induction motors provided with open slots have
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In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is
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