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BARC 2018 EE: Electrical Machines Nuclear Quiz 4
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Question 1
A 40 KW DC shunt motor is loaded to draw rated armature current at any given speed. Calculate output power delivered by motor when motor is driven (i) at twice the rated speed by field control method and (ii) at 1/4 the rated speed by armature control.
Question 2
Two transformers are to be operated in parallel such that they share load in proportion to their kVA ratings. The rating of the first transformer is 1000 kVA ratings. The rating of the first transformer is 1000 kVA and its pu leakage impedance is 0.08 pu. If the rating of second transformer is 350 kVA, its pu leakage impedance is
Question 3
An auto-transformer is supplied with a load of 8 kW and 115 Volt at an unity power factor. If the secondary voltage is 345 volt, calculate the power transferred to the inductive load?
Question 4
The below figure shows the blocked rotor test performed on a 3-phase induction motor.
The readings of the meters are obtained as:
Determine the reading of the voltmeter, if the short-circuit power factor is 0.84.
The readings of the meters are obtained as:
Determine the reading of the voltmeter, if the short-circuit power factor is 0.84.
Question 5
Below figure shows the torque-slip characteristics of a 3-phase induction motor. It displays the motor operating in 3 modes: motoring, generating and braking.
Determine the slip of the rotor in the generating mode.
Determine the slip of the rotor in the generating mode.
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Jul 2ESE & GATE EE
