Power Factor Correction Quiz

What is the purpose of using a bank of capacitors in power factor correction?

• To increase the active power of the installation

• To provide reactive energy compensation

• To reduce the active power of the installation

• To generate additional reactive power

According to the theoretical principles, what does the letter 'C' represent in Fig. L9?

• The active-power elements of the load

• The inductive-reactive elements of the load

• The capacitive-reactive-power elements of the power-factor correction equipment

• The total power consumed by the load

What happens to the reactive current in the system when the power factor correction is fully compensated?

• The reactive current is doubled

• The reactive current is halved

• There is no reactive current flow in the system

• The reactive current remains unchanged

How is the reactive power Qc of a capacitor bank calculated according to Fig. L10?

• Qc = P(tan(φ) + tan(φ'))

• Qc = P(tan(φ) / tan(φ'))

• Qc = P(tan(φ) - tan(φ'))

• Qc = P(φ - φ')

What is the result of the power factor correction in the example provided, where a motor consumes 100 kW at a power factor of 0.75?

• 48 kvar

• 30 kvar

• 75 kvar

• 100 kvar

What type of compensation is provided at low voltage (LV)?

• Fixed-value inductor

• Variable-value capacitor

• Fixed-value capacitor

• Automatic voltage regulator

Compensation of power factor can be carried out by a fixed value of capacitance in which circumstances?

• When the load is highly variable

• In favourable circumstances

• When the load is extremely high

• Only in residential areas

Which of the following is NOT a control method for fixed capacitors?

• Manual: by circuit breaker or load-break switch

• Semi-automatic: by contactor

• Direct connection to an appliance and switched with it

• Remote control via internet

Where are fixed capacitors typically applied?

• At the terminals of capacitive devices

• At the terminals of inductive devices (motors and transformers)

• Only at the busbars of a general power distribution board

• Exclusively at the terminals of a heavily-loaded feeder cable

Automatic capacitor banks are used to maintain the power factor within close limits around a selected level. Where is such equipment commonly applied?

• At the terminals of a lightly-loaded feeder cable

• At the busbars of a general power distribution board

• Only in residential power systems

• At the terminals of capacitive devices