Related Questions

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%
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when
A The impedance of one of the networks is half that of the other
B The impedance of one is the complex conjugate of the other
C The impedance of one is equal to that of the other
D None of the above
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A Remain same
B Decrease
C Increase
D None of the above
The maximum efficiency of resistance loaded class A power amplifier is
A 5%
B 50%
C 30%
D 25%
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
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
A 100%
B Around 90%
C Anywhere between 75% and 90%
D Less than 50%
Power transformers are designed to have maximum efficiency at
A nearly full load
B 70% full load
C 50% full load
D no load
The maximum efficiency of transformer coupled class A power amplifier is ___________
A 30%
B 50%
C 80%
D 45%
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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