Capacitor and Inductor

What is capacitance?

• The resistance offered by a capacitor

• The inductance of a coil

• The ability of a capacitor to store charge

• The voltage across a capacitor

The unit of capacitance is:

• Ohm

• Coulomb

• Henry

• Farad

Which of the following materials is commonly used as a dielectric in capacitors?

• Copper

• Silicon

• Iron

• Ceramic

The capacitance of a parallel plate capacitor is directly proportional to:

• The distance between the plates

• The potential difference across the plates

• The area of the plates

• The current through the capacitor

If the separation between the plates of a capacitor is increased, the capacitance will:

• Increase

• Decrease

• Remain the same

• Become infinite

Which type of capacitor is polarized and typically used in DC circuits?

• Ceramic capacitor

• Electrolytic capacitor

• Film capacitor

• Mica capacitor

What is the reactance of a capacitor at DC?

• Zero

• Infinite

• Same as the capacitance value

• Unknown

In an AC circuit, capacitive reactance can be calculated using which formula?

• Xc = 1/(2πfC)

• Xc = 2πfC

• Xc = 1/(2πfL)

• Xc = 2πfL

When a capacitor is fully charged, the electric current in the circuit will be:

• Zero

• Increasing

• Half of the maximum value

• At its maximum value

What happens to the charge on a capacitor if the voltage across it is doubled?

• It is halved

• It is doubled

• It is quadrupled

• It remains the same