RME Review - Capacitor

The starting capacitor of a single-phase motor is generally a/an _______________ capacitor

• electrolytic

• paper

• ceramic

• metal

A capacitor has a capacitance of 5 F connected to a 6 Volts supply voltage. Find the value of the charge stored in the capacitor?

• 30 Coulombs

• 30 Ampere

• 30 Volts

• 30 ohms

A 4 F capacitor carries a charge of 2.5 C. What is the potential difference across the plates of the capacitor?

• 0.5 Volts

• 0.625 Volts

• 1.25 Volts

• 2.25 Volts

How does a capacitor store energy?

• In the form of a magnetic field

• In the form of an electric field between two plates

• In the form of heat

• By converting AC to DC

What is the primary function of a capacitor in single phase motor?

• for starting

• for converting AC to DC

• for improving efficiency

• for changing the speed

What type of capacitor is commonly used in electronic circuits due to its small size and stability?

• ceramic

• electrolytic

• metal

• supercapacitor

Why do electrolytic capacitors have polarity?

• They are designed for AC circuits only

• Their dielectric material is sensitive to reverse voltage

• They are used only in transformers

• They store energy magnetically

What is the role of a capacitor in a rectifier circuit?

• To convert AC to DC

• To filter and smooth DC output

• To increase resistance

• To amplify the signal

What happens if two capacitors are connected in series?

• The total capacitance decreases

• The total capacitance increases

• The voltage across each capacitor becomes zero

• The capacitors act as resistors

What happens if two capacitors are connected in parallel?

• The total capacitance increases

• The total capacitance decreases

• The voltage across each capacitor increases

• The capacitors short-circuit each other