GATE Three Phase For Electrical Engineering

Test Preparation on GATE Three Phase For Electrical Engineering

1.

Which of the following component is usually fabricated out of silicon steel?

1Bearings
2Shaft
3Statorcore
4Statorcore

2.

The frame of an induction motor is usually made of

1silicon steel
2cast iron
3aluminium
4bronze

3.

The shaft of an induction motor is made of

1stiff
2flexible
3hollow
4any of the above

4.

The shaft of an induction motor is made of

1high speed steel
2stainless steel
3carbon steel
4cast iron

5.

In an induction motor, no-load the slip is generally

1less than 1%
2`1.5%
3`2%
4`4%

6.

In medium sized induction motors, the slip is generally around

1`0.04%
2`0.4%
3`4%
4`14%

7.

In squirrel cage induction motors, the rotor slots are usually given slight skew in order to

1reduce windage losses
2reduce eddy currents
3reduce accumulation of dirt and dust
4reduce magnetic hum

8.

In case the air gap in an induction motor is increased

1the magnetising current of the rotor will decrease
2the power factor will decrease
3speed of motor will increase
4the windage losses will increase

9.

Slip rings are usually made of

1copper
2carbon
3phospor bronze
4aluminium

10.

A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be

1200 Hz
250 Hz
32 Hz
40.2 Hz

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