Q23. The contract load of a dairy plant at 11 kV, 60 Hz is 800 kW, but the peak demand of plant recorded in last three years has not exceeded 600 kW at average power factor of 78%. As per local electricity regulating authorities' norms consumer must maintain a power factor of 93% to avoid non-compliance power factor penalty. What will be capacitance (in micro farad) of a capacitor bank required to install to meet the requirement? (a) 8.56 (b) 7.13 (c) 5.35 (d) None of the option

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Subject Power System Quality

Q23. The contract load of a dairy plant at 11 kV, 60 Hz is 800 kW, but the peak demand of plant recorded
in last three years has not exceeded 600 kW at average power factor of 78%. As per local electricity
regulating authorities' norms consumer must maintain a power factor of 93% to avoid non-compliance
power factor penalty. What will be capacitance (in micro farad) of a capacitor bank required to install to
meet the requirement?
(a) 8.56
(b) 7.13
(c) 5.35
(d) None of the option
Q24. A low pass passive filter has connected to 12 V, 1-kHz input signal. The filter is consists of 1.5 k2
resistor and 0.15 µF capacitor. What will be the amplitude (in volts) of the output signal of filter?
(а) 6.92
(b) 8.48
(c) 6.22
(d) None of the option
Q25. A smelting unit consists of arc fumace is supplied by distribution system and has analyzed for the
harmonics. It is observed that in equipment 1.5 Q resistive element is the path for a fundamental current
of 1.5 Amp containing additional 3rd, 5th and 7h harmonics level whose amplitude are inversely
proportional to their harmonic orders. What will be the % increase in losses of equipment due to
harmonics?
(a) 39.93
(Ъ) 31.76
(c) 37.44
(d) None of the option
Transcribed Image Text:Q23. The contract load of a dairy plant at 11 kV, 60 Hz is 800 kW, but the peak demand of plant recorded in last three years has not exceeded 600 kW at average power factor of 78%. As per local electricity regulating authorities' norms consumer must maintain a power factor of 93% to avoid non-compliance power factor penalty. What will be capacitance (in micro farad) of a capacitor bank required to install to meet the requirement? (a) 8.56 (b) 7.13 (c) 5.35 (d) None of the option Q24. A low pass passive filter has connected to 12 V, 1-kHz input signal. The filter is consists of 1.5 k2 resistor and 0.15 µF capacitor. What will be the amplitude (in volts) of the output signal of filter? (а) 6.92 (b) 8.48 (c) 6.22 (d) None of the option Q25. A smelting unit consists of arc fumace is supplied by distribution system and has analyzed for the harmonics. It is observed that in equipment 1.5 Q resistive element is the path for a fundamental current of 1.5 Amp containing additional 3rd, 5th and 7h harmonics level whose amplitude are inversely proportional to their harmonic orders. What will be the % increase in losses of equipment due to harmonics? (a) 39.93 (Ъ) 31.76 (c) 37.44 (d) None of the option
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