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GATE EE 2018 EXAM:Electrical Machines Quiz 2

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Question 1

The primary mmf is least affected by the secondary terminal conditions in a

Question 2

A Single Phase Transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is

Question 3

In the figure given below all phasors are with reference to the potential at point “O”. The locus of voltage phasor V_YX as R is varied from zero to infinity is shown by

Question 4

For a single phase capacitor start induction motor which of the following statements is valid?

Question 5

It is desired to measure parameters of 230 V/115 V, 2kVA, single-phase transformer. The following wattmeters are available in a laboratory:
W₁: 250V, 10A, Low Power Factor
W₂: 250V, 5A, Low Power Factor
W₃; 150V, 10A, High Power Factor
W₄: 150V, 5A, High Power Factor
The wattmeter’s used in open circuit test and short circuit test of the transformer will respectively be

Question 6

Two single-phase transformers T₁ and T₂ each rated at 500 kVA are operated in parallel. Percentage impedances of T₁ and T₂ are (1 + j6) and (0.8 + j4.8), respectively. To share a load of 1000 kVA at 0.8 lagging power factor, the contribution of T₂ (in kVA) is ________.

Question 7

A single phase 10 kVA 50 Hz transformer with 1 kV primary winding draws 0.5 A and 55 W at rated voltage and frequency on no load. Second transformer has a core with all its linear dimensions

times the corresponding dimensions of the first transformer. The core material and lamination thickness are the same in both transformers. The primary windings of both the transformers have the same number of turns. If a rated voltage of 2 kV at 50 Hz is applied to the primary of the second transformer then the no load current and power respectively are

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ESE & GATE EE Electrical Machines

Jun 21ESE & GATE EE