Computer Programming MCQs

5739 MCQs  (Page 544 of 574)

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The size of a transformer core will depend on__________?
A. Frequency
B. Area of the core
C. Flux density of the core material
D. A. and b. both
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Short circuit test on transformers is conducted to determine____________?
A. Hysteresis losses
B. Copper losses
C. Core losses
D. Eddy current losses
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For the parallel operation of single phase transformers it is necessary that they should have___________?
A. Same efficiency
B. Same polarity
C. Same kva rating
D. Same number of turns on the secondary side.
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The transformer oil should have _______ volatility and _______ viscosity?
A. Low,low
B. High,high
C. Low,high
D. High,low
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The transformer lamination’s are insulated from each other by____________?
A. Mica strip
B. Thin coat of varnish
C. Paper
D. Any of the above
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Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type
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During open circuit test of a transformer:
A. Primary is supplied rated voltage
B. Primary is supplied full-load current
C. Primary is supplied current at reduced voltage
D. Primary is supplied rated kva
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Open circuit test on transformers is conducted to determine____________?
A. Hysteresis losses
B. Copper losses
C. Core losses
D. Eddy current losses
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If the supply frequency to the transformer is increased,”the iron loss will__________?
A. Not change
B. Decrease
C. Increase
D. Any of the above
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Negative voltage regulation is indicative that the load is___________?
A. Capacitive only
B. Inductive only
C. Inductive or resistive
D. None of the above
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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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