In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?
A. 5 percent
B. 10 percent
C. 15 percent
D. 30 percent
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Power transformers have rating_______________?
A. Equal to 50 kva
B. Equal to 100 kva
C. Above 200 kva
D. None of the above
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____________are always double layer type?
A. Closed windings
B. Open windings
C. Either of the above
D. None of the above
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The winding where dummy coils are used is sometimes called______________?
A. Duplex winding
B. Triplex winding
C. Forced winding
D. None of the above
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When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?
A. Short pitch
B. Full pitch
C. Either of the above
D. None of the above
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The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?
A. Front pitch
B. Winding pitch
C. Commutator pitch
D. Back pitch
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Dummy coil should not be used in_________________?
A. Small machines
B. Large machines
C. Either a. or b.
D. None of the above
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Power transformers should be designed to have maximum efficiency________________?
A. At one-fourth load
B. At one-half load
C. At or near full load
D. Any of the above
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Yokes with rectangular cross-section are used for_______________?
A. Small capacity transformers
B. Medium capacity transformers
C. Large capacity transformers
D. Any of the above
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Which of the following methods is most accurate ?
A. Equivalent current method
B. Equivalent power method
C. Equivalent torque method
D. Method of average losses
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Word of the Day
16 Sep
Incarcerate
imprison or confine.
قید کرنا، اسیری

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