Electrical machine design Archives

1. Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling

2 MVA

5 MVA

7.5 MVA

10 MVA

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2. In a Weston frequency meter, the magnetic axes of the two fixed coils are

Parallel

Perpendicular

Inclined at 60Â°

Inclined at 15Â°

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3. The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following?

Corrugations

Fins

Tubes

All of the above

Detailed SolutionThe heat dissipating

capability of transformers of ratings higher than 30 kVA in increased by providing which of the following?

4. Operating torques in analogue instruments are

deflecting and control

deflecting and damping

deflecting, control and damping

vibration and balancing

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5. The flash point of transformer oil should be higher than

40Â°C

60Â°C

80Â°C

104Â°C

Detailed

Solution

6. Commonly used instruments in power system measurement are

induction

moving coil or iron

rectifier

electrostatic

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7. With direct water cooling it is possible to have ratings of about

200 MW

300 MW

400 MW

600 MW

Detailed SolutionWith direct

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water cooling it is possible to have ratings of about

8. An induction wattmeter can be used for

both D.C. and A.C.

and A.C. B.

any of the above

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9. To avoid the effect of stray magnetic field in

magnetic screening

Wagner earthing device

bridges we can use A. magnetic screening B. Wagner earthing device C. wave filters

any of the above

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10. The operating voltage of a meggar is about

6 V

12 V

40 V

100 V

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