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Tricky Power Systems
A power system network is connected as shown in the figure below.
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 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 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 ___________
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 ______________
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 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
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 ___________
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 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
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 ___________
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