EXAMIANS
The flux involved in the emf equation of a transformer has
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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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If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is
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A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because
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Breadth factor is defined as the ratio of
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It is advisable to start a DC series motor with some load to
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Which of the following windings are necessary in case of all dc machines?
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A DC generator can be considered as
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A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be
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To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by
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