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Power Systems
Tricky Power Systems
Quiz 1
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Q.1
A power system network is connected as shown in the figure below.
a) 14.4
b) 22.1
c) 16.2
d) 18.2
Q.2
A single phase distributor of 1 km long has resistance and reactance per conductor of 0.and 0.Ω respectively. If the far end voltage Vb=and current is atat 0.8 lag. At the midpoint a current ofis tapped at a pf of 0.6 pf with ref to voltage Vm at mid point. The voltage magnitude at M is __________
a) 218V
b) 200V
c) 232V
d) 220V
Q.3
A single phase motor is connected to 400V, 50Hz supply. The motor draws a current of 31.at a power factor 0.7 lag. The capacitance required in parallel with motor to raise the power factor of 0.9 lag (in micro farads) is ___________
a) 94.62
b) 282.81
c) 108.24
d) 46.87
Q.4
A single phase motor is connected to 400V, 50Hz supply. The motor draws a current of 31.at a power factor 0.7 lag. The additional reactive power (in VAR) to be supplied by the capacitor bank will be ___________
a) 4756
b) 4873
c) 4299
d) 9055.3
Q.5
AkV TL has following line constants A=0.85ʟ5o, B=200ʟ75o. The active power received if the voltage to be maintained is 275kV will be ______________
a) 117.63
b) 220
c) 120
d) 115.25
Q.6
AkV TL has following line constants A=0.85ʟ5o, B=200ʟ75o. The active power angle such that the voltage to be maintained at the other end will bekV ______________
a) 22
b) 16
c) 18
d) 24
Q.7
A power system has a maximum load ofMW. Annual load factor is 50%. The reserve capacity of plant is _____ if the plant capacity factor is 40%.
a) 3.75 MW
b) 4.75 MW
c) 18.75 MW
d) 5.75 MW
Q.8
AMVA synchronous generator operates on full load at a frequency ofHz. The load is suddenly reduced toMW. Due to time lag in governor system, the steam valve begins to close after 0.4s. The change in the frequency (H=5 kW-s/KVA) is ___________
a) 1
b) 0.5
c) -1.5
d) 0.8
Q.9
AHz four pole turbo-generator ratedMVA,kV has an inertia constant of 8 MJ/MVA. If the mechanical input is suddenly raised toMW for an electrical load of 50MW, then the rotor acceleration is __________
a) 337.5
b) 3.375
c) 457.5
d) 4.57
Q.10
A single phase TL has copper conductor of 0.cm2 cross section through whichkW at UPF atV is to be maintained. If the efficiency of transmission line is 90%, then the minimum length of TL is _________(in km and take specific resistance to be 1.μΩ/cm).
a) 13.6 km
b) 14 km
c) 136 km
d) 16.4 km
Q.11
An isolated generator connected to a turbine with its continuous maximum power ofMW,Hz. Generator connected with two loads of 8 MW, each operate atHz.. Generator hasdroop characteristic. If an additional load of 6 MW is added then frequency will be ___________
a) 50.25
b) 40.75
c) 49.75
d) 48.75
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