Worksheet

1.

Emf is __________

a.

Electromotive force

b.

Electromagnetic force

c.

Electromechnical force

d.

Electricmechical force

2.

A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is

a.

4.8

b.

6.8

c.

7.8

d.

None

3.

A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is

a.

4.8

b.

6.8

c.

7.8

d.

None

4.

A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is

a.

4.8

b.

6.8

c.

7.8

d.

None

5.

In a salient pole synchronous motor, the developed reluctance torque attains the maximum value when the load angle in electrical degrees is

a.

60

b.

45

c.

90

d.

None