Computer Programming MCQs

5739 MCQs  (Page 13 of 574)

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Which of the following does not change in a transformer ?
A. Current
B. Voltage
C. Frequency
D. All of the above
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In a transformer the energy is conveyed from primary to secondary_________?
A. Through cooling coil
B. Through air
C. By the flux
D. None of the above
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A transformer core is laminated to__________?
A. Reduce hysteresis loss
B. Reduce eddy current losses
C. Reduce copper losses
D. Reduce all above losses
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The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?
A. Tightness of clamping
B. Gauge of laminations
C. Size of laminations
D. All of the above
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The no-load current drawn by transformer is usually what per cent of the full-load current ?
A. 0.2 to 0.5 per cent
B. 2 to 5 per cent
C. 12 to 15 per cent
D. 20 to 30 per cent
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No-load on a transformer is carried out to determine______________?
A. Copper loss
B. Magnetising current
C. Magnetising current and loss
D. Efficiency of the transformer
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The dielectric strength of transformer oil is expected to be______________?
A. Lkv
B. 33 kv
C. 100 kv
D. 330 kv
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Sumpner’s test is conducted on transformers to determine_____________?
A. Temperature
B. Stray losses
C. All-day efficiency
D. None of the above
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The permissible flux density in case of cold rolled grain oriented steel is around__________?
A. 1.7 wb/m2
B. 2.7 wb/m2
C. 3.7 wb/m2
D. 4.7 wb/m2
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The efficiency of a transformer will be maximum when_____________?
A. Copper losses = hysteresis losses
B. Hysteresis losses = eddy current losses
C. Eddy current losses = copper losses
D. Copper losses = iron losses
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Word of the Day
10 Jul
Spur
a thing that prompts or encourages someone; an incentive.
اکسانے والی بات، آر،مہمیز

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