M3.14 Cat B

Select the correct phrase:

• In a capacitive circuit the voltage leads the current.

• In an inductive circuit the current lags the voltage.

• In a resistive circuit, the current and voltage are out of phase.

• In a capacitive circuit the current lags the voltage.

Select the correct sentence:

• Active power can only be developed in a pure inductance.

• Reactive power is developed in a capacitor.

• Apparent power increases as the power factor increases.

• Power factor is apparent power divided by active power.

Select the correct combination of quantity (equation) symbol and unit:

• W, Watt

• P, VAr

• X, Ohm

• Q, Watt

In a sinusoidal AC circuit containing an inductance and a resistance in series:

• the sum of the voltages across both components, as measured by a multimeter, adds up to the supply voltage.

• the voltage across both components are out of phase by 90 degrees.

• the current through each component is different.

• the inductance is proportional to the supply frequency.

Complete the sentence:

In a parallel circuit containing a capacitor and resistor connected to a sinusoidal supply:

• the voltage across each component is the same.

• the current in each component is the same.

• the current in the capacitor lags the applied voltage by 90 degrees.

• the total current drawn goes down as the frequency goes up.

Choose the ones with the correct unit

• P [W]

• S [VA]

• S [VAR]

• P [kW]

Calculation involving power must use _______ value of voltage and current

• corresponding

• supply

• root mean square (rms)

• total

Formula for inductive capacitance is...

• It does not exist

The formula to find X_C is

The unit of capacitor is: