Applications of Capacitors

In a full-wave rectifier circuit, what is the main role of the capacitor?

• To increase current
• To reduce AC voltage
• To smooth the output voltage after rectification
• To change current frequency

When increasing the capacitance of the capacitor in a rectifier circuit, which of the following happens?

• The current becomes more intermittent
• Input voltage decreases
• Output voltage becomes smoother
• Current frequency changes

In an LC resonance circuit, what is the role of the capacitor?

• To generate AC current
• To store electric charge for a long time
• To adjust the frequency
• To vary voltage

A radio adjusts the receiving frequency by changing the value of which component?

• Inductor
• Capacitor
• Current intensity
• Ambient temperature

The key specifications on a chemical capacitor usually include:

• Resistance and maximum current
• Capacitance and maximum voltage
• Power and frequency
• Thermal coefficient and resistance

What does the symbol 'μF' on a capacitor mean?

• Microfarad – unit of capacitance
• Megafarad – unit of current
• Unit of breakdown voltage
• Energy loss coefficient

Electrolytic capacitors have polarity. What might happen if you reverse their polarity in a circuit?

• No effect
• Voltage increases
• The capacitor may be damaged or explode
• It becomes an inductor

Before removing a capacitor from a circuit, what should be done for safety?

• Discharge the capacitor
• Record its value
• Measure resistance
• Replace it with another

A capacitor marked '104' corresponds to what capacitance value?

• 10 μF
• 104 μF
• 100 nF (0.1 μF)
• 4 μF

When choosing a capacitor for a circuit, how should its rated voltage compare to the circuit voltage?

• Equal or lower
• Slightly higher for safety
• Exact match only
• Doesn't matter