Related Questions

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
Power transformers are generally designed to have maximum efficiency around
A no-load
B half-load
C near full-load
D 10% overload
Distribution transformers are generally designed for maximum efficiency around
A 90% load
B Zero load
C 25% load
D 50% load
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
A short-circuiting of the secondaries
B power factor of one of the transformers is leading while that of the other lagging
C transformers having higher copper losses will have negligible core losses
D loading of the transformers not in proportion to their kVA ratings
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -
A 87.8%
B 86.7%
C 88.26%
D 88.9%
The efficiency of two identical transformers under load conditions can be determined by
A short-circuit test
B back-to-back test
C open circuit test
D any of the above
Power transformers have rating
A equal to 50 kVA
B equal to 100 kVA
C above 200 kVA
D none of the above
Generators for peak load plants are usually designed for maximum efficiency at
A 25 to 50 percent full load
B 50 to 75 percent full load
C full load
D 25 percent overload
D.C. generators are normally designed for maximum efficiency around
A Full load
B Rated r.p.m.
C Rated voltage
D All of the above
Efficiency of power transfer when maximum transfer of power c xerosis
A 100%
B 80%
C 75%
D 50%

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