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AE 2019 || Day 11 || Electrical Machines Quiz 3

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Question 1

How can the reactive power delivered by a synchronous generator be controlled?

Question 2

For a two-winding power transformer, with the effects of the no-load current being neglected, the ‘Voltage Regulation’ can be zero at load, when the load power factor is

Question 3

For power transformers of larger ratings, the tappings are located in the middle portion of the winding to

Question 4

The full-load copper loss and iron loss of a transformer are 6400 W and 5000 W, respectively. What are the above copper loss and iron loss, respectively at half-load?

Question 5

Sludge formation in transformer oil is due to which one of the following?

Question 6

Percentage resistance and percentage reactance of a transformer are 1% and 4%, respectively. What is voltage regulation at power factor 0.8 lagging and 0.8 leading?

Question 7

What is the phase displacement between primary and secondary voltages for a star-delta, 3-phase transformer connection shown below?

Question 8

A single-phase, 10 kVA, 2000/200 V, 50 Hz transformer is connected to form an autotransformer as shown in the figure given below. What are the values of V₁ and I₂, respectively?

Question 9

A triangular mmf wave is produced in the air-gap of an electric machine. Such a wave is produced by

Question 10

For a P-pole machine, the relation between electrical and mechanical degrees is

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ESE & GATE EE General

Jun 14ESE & GATE EE