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Engineering :: Energy Conversion


91.  The power factor of a load of 100 kW is to be raised from 0.5 lagging to 0.9 lagging. The KVA rating of the capacitor will be
A. 12.5 B. 25
C. 75 D. 125
E. 212.5    

92.  The power supplied to domestic consumers is at 220 volts. This represents
A. Peak value of voltage B. Mean value of voltage
C. rms value of voltage D. Any of the above
E. None of the above    

93.  The highest voltage at which the power is transmitted in India is
A. 33 kV B. 66 kV
C. 132 kV D. 220 kV
E. 400 kV    

94.  Which of the following is the advantage of de transmission?
A. Absence of line inductance and capacitance problems B. No skin effects
C. For the same working voltage the potential stress on the insulation is less D. No stability problems
E. All of the above    

95.  If K be the volume of conductor for two wire dc system, then for the same voltage the volume of conductor for 3 wire dc system for supplying the same load will be
A. 0.25 K B. 0.3125 K
C. 1.25 K D. 2 K
E. 5 K    

96.  The voltage of a 2 wire de system is raised from 200 V to 400 V. For the same power transmitted over the same distance and for the same power loss, the saving in conductor copper will be
A. 25% B. 40%
C. 50% D. 60%
E. 75%    

97.  Which type of conductors are used for transmitting bulk of power at high voltage?
A. ACSR B. Copper
C. Cadmium copper D. Galvanised steel
E. Any of the above    

98.  As compared to copper, the conductivity of aluminium is nearly
A. 85% B. 80%
C. 60% D. 40%
E. 20%    

99.  The specific gravity of copper is
A. 16.9 B. 13.9
C. 5.9 D. 8.9
E. 2.9    

100.  The specific gravity of aluminium is
A. 1.71 B. 2.71
C. 3.71 D. 4.71
E. 5.71    




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