Power Factor Corrections

A load of 10,000 kVA, 80% lagging is connected to a 13,200 V line. How much capacitive reactive power is needed to correct the power factor to 97% lagging?

Which of the following is used in power factor correction?

A 1-phase, 220-V 50-A induction motor draws 10 kW of power. A 1-phase, 8-kVA synchronous motor is placed parallel with it in order to adjust the power factor to unity. What must be the power factor of the synchronous motor?

A capacitor is placed in parallel with two inductive loads, one of 20 A at 30° lagging and another one of 40 A at 60° lagging. What must be the current in the capacitor so that the total current from the source shall be at unity power factor?

A 50 hp, 440 v, 60 HZ, 3-phase motor operates at full-load with an efficiency of 89% and power factor of 0.85 lagging. Determine the capacitance in μf per phase of wye-connected capacitor bank to be connected across the motor terminals to improve the power factor to 0.95 lagging.

A factory works at 400 kW, 0.7 pf lagging. A 200 hp synchronous motor is connected to the plant to correct the pf to 75% lagging. What should be the pf of the synchronous motor?

A 10 HP, 230 v, 60 Hz three-phase motor has an efficiency of 90% and pf of 0.85 lagging. What is the capacitance per phase in microfarads to be connected in parallel with the motor correct the power factor to unity?

A 2.3 kV three-phase system supplies a 120 kW, 0.6 p.f. lagging balanced load. Determine the capacitance in each phase of a wye-connected capacitor bank to adjust the power factor to 0.90 lagging.

A single – phase load on 220 v takes 5 kW at 0.6 lagging power factor. Find the kVAR size of capacitor, which may be connected in parallel with this motor to bring the resultant power factor to unity.

A 400-volt, 50Hz star connected induction motor takes a line current of 50 amperes at a p.f of 0.8 lagging. Three mesh connected capacitors are connected to raise the p.f to 0.9. Find the value of each capacitor in microfarads.

It is desired to correct the 2,400 – KVA 0.65 Lagging power factor load in a plant unity by the installation of a synchronous condenser. Calculate the KVA rating of the latter.

Two single-phase transformer are each rated 75 KVA are connected in V or open delta to serve a 3-phase load of 120 KW at 0.80 power factor lagging. Determine the size in KVAR of the capacitor needed to prevent overloading of the transformers.

A 50-MVA, 11-kV, 3-phase alternator supplies full load at a lagging power factor of 0.7. What would be the percentage increase in earning capacity if the power factor is increased to 0.95?

The capacitors of power factor correction are rated in terms of

The power factor of a 20 MW, 13.2 kV, 3Φ motor is corrected to 0.9 by a 230 μF capacitor (per phase, wye). What is its initial power factor?

In an ac circuit, a low value of KVAR compared with KW indicates

A 12 KVA load A operating at 0.70 p.f. lagging and a 10 KVA load B operating at 0.80 p.f. lagging are connected in parallel and supplied by a 440 v, 60 Hz generator. Determine the system power factor.

A 400-volt, 50 Hz star connected induction motor takes a line current of 50 amperes at a p.f. of 0.8 lagging. Three mesh (delta) connected capacitors are connected to raise the p.f. to 0.9. Find the value of each capacitor in microfarads.

Two single-phase transformers each rated 75 kVA are connected in V or open delta to serve a three-phase load of 120 kW at 0.80 power factor lagging. To prevent overloading of the transformers, determine the size of the capacitor in kVAR.

Other than using capacitors, power factor improvement can also be achieve using which of the following machines?