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Which one of the followingstatement.
is not correct for the use of bundled conductors in transmission lines
Reduction in radio interference
Increase in interference with communication lines
Reduction in corona 1088
Control of voltage gradient
For a 500 Hz frequency excitation, a 50 #em long power line will be modelled as
short line
long line
data insufficient for decision
medium line
A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8lag.
A delta connected 3-phase capacitor is used to improve the power factor tounity.
The capacitance perphase of the capacitor in micro-farads is
1.316
3.948
0.439
11.844
A consumerconsume.
600 kWh per day at a load factor of 0.40. If the coneumer increases the load factor of 0.70 without increasing the maximum demand, what is the consumption of energy in kWh
1000 kWh
950 kWh
1100 kWh
1050 kWh
When bundle conductors are used in place of single conductors, the effective inductance and capacitance will respectively
increase and decrease
decrease and remain unaffected
decrease and increase
remain unaffected and increase
What is the utilization factor of a power station which supplies the following loads Load A: Motor load of200 kW between 10 AM to7PM Load B : Lighting load of 100 kW between 7 PM to 11 PM Load C : Pumping load of 110 kW between 3 PM to 10 AM
1.00
2.56
1.60
1.32
The yearly load duration curve of a power plant is a straightline.
The maximum load is 750 MW and the minimum load is 600 Mw. The capacity of the plant is 900 MW. What is the capacity factor and utilization factor
0.56,0.80
0.78, 0.9
0.83,0.75
0.75, 0.83
A medium line with parameters A, B, C, D is extended by connecting a short line of impedance Z in series The overall ABCD parameteres of the series combinatton will be
A, AZ, C + D/Z, D
A + BZ, B, C + DZ, D
AZ, B, C/Z, D
A, AZ + B, C, CZ + D
A 100 km transmiesion line ia deaigned for a nominal voltage of 132 kV and conaiala of one conductor perphase.
The line reactance is 0.726 ohm/km. The static transmission capacity of the line, in Megawatts, would be
132
720
416
240
For equilateral spacing of conductors of an untrasposed 3-phase line, we have
unbalanced receiving end voltage and no communication interference
balanced receiving end voltage and no communication interference
unbalanced receiving end voltage and communication interference.
balanced receiving end voltage and communication interference
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