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GATE 2019: Electrical Machines Quiz 5
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Question 1
Find the current ratings for the primary and secondary windings for an ideal transformer is rated at 2400/120 V, 9.6 KVA and has 50 turns on the secondary size?
Question 2
The readings of the instruments in an open-circuit test of a transformer are given below:
Ammeter = 6.8 A
Voltmeter = 155 V
Wattmeter = 342 W
Determine the no-load power factor.
Ammeter = 6.8 A
Voltmeter = 155 V
Wattmeter = 342 W
Determine the no-load power factor.
Question 3
A transformer fed from an alternator at 230V, 50Hz has eddy current loss 100 W and hysteresis loss of 200 W. if the speed of the prime mover driving the alternator drops to 90% of the previous speed, then eddy current and hysteresis losses of the transformer would respectively be –
Question 4
A 11/6.6/0.5kV, star/star/delta, three winding transformer has a magnetizing current of 3A. At rated voltages, the secondary supplies a balanced load of 300 kVA at 0.8 pf lag and tertiary supplies a balanced load of 150 kW at 0.9 pf lead. The magnitude of primary phase current (in Amp) will be
Question 5
A 400/200 volts transformer has pu impedance of 0.05. The HV side voltage required to circulate full load current during short circuit test is
Question 6
A 6.6/0.4 kV, 100kVA distribution transformer has 1.2% resistance and 5% reactance. The voltage to be applied to primary to maintain secondary terminal voltage of 0.4kV at full load, 0.8pf leading is
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Jun 12ESE & GATE EE
