Power Systems T...

A single-phase AC supply has RMS voltage of 230 V at 50 Hz and a feeder (source) impedance of 5 Ω inductive reactance after which a single-phase load having Z_L = (20 + j 15) Ω is connected. If it is to be realized as a unity power factor load on the AC supply system using a series compensator consisting of lossless as a unity power factor load on the AC supply system using a series compensator consisting of lossless passive elements. The value of the compensator element is

A shunt capacitor is rated for 200 kV, 100 MVAr at 50 Hz. Its frequency is decreased by 10% and system voltage increased by 5%. Then reactive power generated by shunt capacitor is – (in MVAr)

An alternator is supplying a load of 400 kW at a power factor of 0.5 lagging. If the power factor is raised to unity, how many more kilowatts can alternator supply for the same kVA loading?

A single-phase AC supply has RMS voltage of 230 V at 50 Hz and a feeder (source) impedance of 5 Ω inductive reactance after which a single-phase load having Z_L = (20 + j 15) Ω is connected. If a series compensator is used to raise the load voltage to the input voltage (230 V), the value of the compensator element is

A 3 phase, 6 kW induction motor has a p.f. of 0.6 lagging. A bank of capacitors is delta across the supply terminals and p.f. is raised to 0.9 lagging. Determine the KVAR rating of the capacitors connected in each phase.

A short capacitor used in power system for VAR compensation is operated at 95% of its rated frequency and 90% of its rated voltage. The VAR supplied by shunt capacitor (as compared to its rated capacity) is __

A single-phase AC generator supplies the following loads:

Load 1: Lighting load of 20 kW at unity power factor

Load 2: Induction motor load of 100 kW at pf of 0.707 lagging

Load 3: Synchronous motor load of 50 kW at pf 0.9 leading

In series compensation, if the degree of compensation is 0.5, then the power transfer capability of transmission line with compensation will be __________ times the power transfer capability without compensation.

A synchronous motor improves the power factor of a load of 200 kW from 0.8 lagging to 0.9 lagging. Simultaneously the motor carries a load of 80 kW. The power factor at which the motor operates is ________