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