GATE EE : Electrical Machines Champion Quiz 1 for ESE & GATE EE Exams

Question 1

The single phase, 50Hz, iron core transformer in the circuit has both the vertical arms of cross sectional area 20 cm² and both the horizontal arms of cross sectional area 10cm². If the two windings shown were wound instead on opposite horizontal arms, the mutual inductance will

Question 2

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

Question 3

In the phasor diagram, what happens to the inductive load?

Question 4

A 1 kVA, 230V/100V, single phase, 50 Hz transformer having negligible winding resistance and leakage inductance is operating under saturation, while 250 V, 50 Hz sinusoidal supply is connected to the high voltage winding. A resistive load is connected to the low voltage winding which draws rated current. Which one of the following quantities will not be sinusoidal?

Question 5

Three single-phase transformers are connected to form a 3-phase transformer bank. The transformers are connected in the following manner:

The transformer connection will be represented by

Question 6

The bridge method in transformer will:

Question 7

In three phase, wye or delta three wire system, under balanced or unbalanced conditions, with any power factor, the two-wattmeter method is a practical and commonly used method of measuring total three phase power.

In 3-phase delta connection with two wattmeter method, the power obtained by two wattmeters is 21 KW & 15 KW. What will be the power factor?

Question 8

In three phase, wye or delta three wire system, under balanced or unbalanced conditions, with any power factor, the two-wattmeter method is a practical and commonly used method of measuring total three phase power.

If the efficiency in the circuit is 80%, then what will be the output power?

Question 9

In transformer parallel operations, which among the following is incorrect?

Question 10

Two transformers when operating in parallel will share the load depending upon which of the following?