Computer Programming MCQs

5739 MCQs  (Page 546 of 574)

Attempt Computer Programming MCQs Quiz
Power transformers are generally designed to have maximum efficiency around__________?
A. No-load
B. Half-load
C. Near full-load
D. 10% overload
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Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A. Hysteresis losses are reduced
B. Saving in winding material
C. Copper losses are negligible
D. Eddy losses are totally eliminated
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The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be___________?
A. 6400 w
B. 1600 w
C. 800 w
D. 400 w
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The value of flux involved m the e.m.f. equation of a transformer is____________?
A. Average value
B. R.m.s. value
C. Maximum value
D. Instantaneous value
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Silicon steel used in lamination’s mainly reduces___________?
A. Hysteresis loss
B. Eddy current losses
C. Copper losses
D. All of the above
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Helical coils can be used on___________?
A. Low voltage side of high kva transformers
B. High frequency transformers
C. High voltage side of small capacity transformers
D. High voltage side of high kva rating transformers
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Harmonics in transformer result in___________?
A. Increased core losses
B. Increased i2r losses
C. Magnetic interference with communication circuits
D. All of the above
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The core used in high frequency transformer is usually___________?
A. Copper core
B. Cost iron core
C. Air core
D. Mild steel core
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Solid Grounding is used for Voltages?
A. Above 220 kv
B. Above 11kv
C. Below 660 v
D. Below 115 v
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Which one of the following is used to define the structure of the relation, deleting relations and relating schemas?
A. Dml(data manipulation langauge)
B. Ddl(data definition langauge)
C. Query
D. Relational schema
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Word of the Day
11 Jul
Envisage
contemplate or conceive of as a possibility or a desirable future event.
گمان کرنا، تصور کرنا، سوچنا

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