| 1. | Which of the following is not a routine test on transformers ? | |
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Core insulation voltage test
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Impedance test
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Radio interference test
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Polarity test
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Report Question| 2. | Which of the following does not change in an ordinary transformer ? | |
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Frequency
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Voltage
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Current
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Any of the above
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| 3. | The main reason for generation of harmonics in a transformer could be ? | |
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fluctuating load
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poor insulation
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mechanical vibrations
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saturation of core
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| 4. | ln a transformer the tappings are generally provided on ? | |
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primary side
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secondary side
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low voltage side
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high voltage side
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| 5. | A common method of cooling a power transformer is ? | |
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natural air cooling
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air blast cooling
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oil cooling
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any of the above
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| 6. | Efficiency of a power transformer is of the order of ? | |
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100 per cent
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98 per cent
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50 per cent
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25 per cent
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| 7. | A transformer transforms ? | |
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voltage
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current
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power
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frequency
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| 8. | While conducting short-circuit test on a transformer the following side is short-circuited ? | |
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High voltage side
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Low voltage side
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Primary side
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Secondary side
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| 9. | Which of the following acts as a protection against high voltage surges due to lightning and switching ? | |
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Horn gaps
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Thermal overload relays
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Breather
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Conservator
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| 10. | Which of the following transformers is smallest ? | |
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2 kVA, 500 Hz
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2 kVA, 400 Hz
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2 kVA, 200 Hz
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2kVA, 50 Hz
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