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GATE EE : Electrical Machines Champion Quiz 3
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Question 1
Inter poles in DC Machines reduces:
Question 2
A three-phase, salient pole synchronous motor is connected to an infinite bus. It is operated at no load at normal excitation.
The field excitation of the motor is first reduced to zero and then increased in the reverse direction gradually. Then the armature current
The field excitation of the motor is first reduced to zero and then increased in the reverse direction gradually. Then the armature current
Question 3
A separately excited DC generator has an armature resistance of 0.1Ω and negligible armature inductance. At rated field current and rated rotor speed, its open-circuit voltage is 200 V. When this generator is operated at half the rated speed, with half the rated field current, an unchanged 1000 μF capacitor is suddenly connected across the armature terminals. Assume that the speed remains unchanged during the transient. At what time (in microsecond) after the capacitor is connected will the voltage across it reach 25 V?
Question 4
A 4-point starter is used to start and control the speed of a
Question 5
The dc motor, which can provide zero speed regulation at full load without any controller, is.
Question 6
Short pitch winding:
Question 7
What is the frequency of rotor current of a 50 Hz induction motor operating at 2% slip?
Question 8
What is the shunt resistance component in equivalent circuit obtained by no load test of an induction motor representative of?
Question 9
A 4–pole induction motor, supplied by a slightly unbalanced three–phase 50 Hz source, is rotating at 1440 rpm. The electrical frequency in Hz of the induced negative sequence current in the rotor is
Question 10
Assertion (A): Under V/f control of induction motor, the maximum value of the developed torque remains constant over a wide range of speed in the sub-synchronous region.
Reason (R): The magnetic flux is maintained almost constant at the rated value by keeping the ratio V/f constant over the considered speed range.
Reason (R): The magnetic flux is maintained almost constant at the rated value by keeping the ratio V/f constant over the considered speed range.
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Jun 24ESE & GATE EE
