In order to improve the power factor for a single phase load P, where PFold= 0.4, PF new 0.90, (Vnew Vold), if the new per phase transmission losses (after improvement) PLosses.new-80 kW, the old losses (before) PLosse-old is: a. 425 kW b. 405 kW c. 310 kW d. 275 kW e. 225 kW

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1. In order to improve the power factor for a single phase load P, where PFold= 0.4, PF new=
0.90, (Vnew Vold), if the new per phase transmission losses (after improvement)
PLosses.new= 80 kW, the old losses (before) PLosse-old is:
b. 405 kW
c. 310 kW d. 275 kW
a. 425 kW
e. 225 kW
2930
2. If the voltage regulation of a transformer VR-5.4 % while the no load output voltage
VEL 11.1 kV, The full load voltage VNL is:
a. 11 kV
b. 11.2 kV c. 11.4 kV d. 11.7 kV e. 11.9 kV
3. To design a 3-phase line has conductors 4 cm in diameter, with the dielectric strength of air is
30 kV (max) per cm, air density factor 8 = 0.90 and irregularity factor mo = 0.925 ,disruptive
critical voltage for the line (Vc L-L) = 252.815 kV, (the distance d) for spaced conductor
aequilaterally is :
a. 200 cm
b. 185 cm
d. 100 cm
c. 125 cm
e. none
4. A 50 Hz, 3-phase line has conductors 3 cm in radius, spaced 2 metres apart in equilateral
with disruptive critical voltage for the line (Vc phase) = 150 kV, air density factor 80-90
at applied voltage V=165 kV per phase, the corna loss in kW/phase/km is :
b. 6.323
a. 5.561
c. 8.225
d. 10.433 e. none
Transcribed Image Text:1. In order to improve the power factor for a single phase load P, where PFold= 0.4, PF new= 0.90, (Vnew Vold), if the new per phase transmission losses (after improvement) PLosses.new= 80 kW, the old losses (before) PLosse-old is: b. 405 kW c. 310 kW d. 275 kW a. 425 kW e. 225 kW 2930 2. If the voltage regulation of a transformer VR-5.4 % while the no load output voltage VEL 11.1 kV, The full load voltage VNL is: a. 11 kV b. 11.2 kV c. 11.4 kV d. 11.7 kV e. 11.9 kV 3. To design a 3-phase line has conductors 4 cm in diameter, with the dielectric strength of air is 30 kV (max) per cm, air density factor 8 = 0.90 and irregularity factor mo = 0.925 ,disruptive critical voltage for the line (Vc L-L) = 252.815 kV, (the distance d) for spaced conductor aequilaterally is : a. 200 cm b. 185 cm d. 100 cm c. 125 cm e. none 4. A 50 Hz, 3-phase line has conductors 3 cm in radius, spaced 2 metres apart in equilateral with disruptive critical voltage for the line (Vc phase) = 150 kV, air density factor 80-90 at applied voltage V=165 kV per phase, the corna loss in kW/phase/km is : b. 6.323 a. 5.561 c. 8.225 d. 10.433 e. none
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