Computer Programming MCQs

5739 MCQs  (Page 20 of 574)

Attempt Computer Programming MCQs Quiz
An open-circuit test on a transformer is conducted primarily to measure______________?
A. Insulation resistance
B. Copper loss
C. Core loss
D. Total loss
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A no-load test is performed on a transformer to determine_______________?
A. core loss
B. copper loss
C. efficiency
D. magnetising current
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The voltage transformation ratio of a transformer is equal to the ratio of_______________?
A. Primary turns to secondary turns
B. Secondary current to primary current
C. Secondary induced e.m.f. to primary induced e.m.f
D. Secondary terminal voltage to primary applied voltage
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Part of the transformer which is most subject to damage from overheating is_____________?
A. Iron core
B. Copper winding
C. Winding insulation
D. Frame or case
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If a transformer is switched on to a voltage more than the rated voltage______________?
A. Its power factor will deteriorate
B. Its power factor will increase
C. Its power factor will remain unaffected
D. Its power factor will be zero
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Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
A. Approximately equal to one
B. Less than one
C. Great than one
D. None of the above
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Minimum voltage regulation occurs when the power factor of the load is_____________?
A. Unity
B. Lagging
C. Leading
D. Zero
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The efficiencies of transformers compared with that of electric motors of the same power are____________?
A. About the same
B. Much smaller
C. Much higher
D. Somewhat smaller
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In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?
A. Less than 15 a
B. More than 15 a
C. 15 a
D. None of the above
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The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
A. Avoids core saturation and high voltage induction
B. Is safe to human beings
C. Protects the primary circuit
D. None of the above
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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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