Computer Programming MCQs

5739 MCQs  (Page 17 of 574)

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The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
A. Magnetostrication
B. Boo
C. Hum
D. Zoom
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Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?
A. Bmax
B. Bmax1-6
C. Bmax1-83
D. B max
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The transformer ratings are usually expressed in terms of______________?
A. Volts
B. Amperes
C. Kw
D. Kva
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Material used for construction of transformer core is usually___________________?
A. Wood
B. Copper
C. Aluminium
D. Silicon steel
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The thickness of laminations used in a transformer is usually____________?
A. 0.4 mm to 0.5 mm
B. 4 mm to 5 mm
C. 14 mm to 15 mm
D. 25 mm to 40 mm
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The function of conservator in a transformer is___________________?
A. To project against’internal fault
B. To reduce copper as well as core losses
C. To cool the transformer oil
D. To take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
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In a transformer the resistance between its primary and secondary is____________?
A. Zero
B. 1 ohm
C. 1000 ohms
D. Infinite
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A transformer oil must be free from________________?
A. Sludge
B. Odour
C. Gases
D. Mositure
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A Buchholz relay can be installed on______________?
A. Oil cooled transformers
B. Auto-transformers
C. Air-cooled transformers
D. Welding transformers
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Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
A. 50°c
B. 80°c
C. 100°c
D. 150°c
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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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