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Electrical Ballasts Quiz

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Questions and Answers

Which type of ballast is commonly used in fluorescent lamps to limit the current through the tube?

Resistor

Capacitor

Inductor (correct)

Electronic ballast

What is the purpose of an electrical ballast?

To decrease the amount of current in an electrical circuit (correct)

To regulate the power supply in an electrical circuit

To stabilize the voltage in an electrical circuit

To increase the amount of current in an electrical circuit

Which type of ballast is used in compact fluorescent lamps (CFLs) and high-intensity discharge lamps (HID lamps)?

Resistor

Electronic ballast (correct)

Capacitor

Inductor

Why is an electrical ballast necessary in fluorescent lamps?

To limit the current through the tube (A) Signup and view all the answers

What happens to the terminal voltage of a load when current through the load increases?

It decreases (C) Signup and view all the answers

Which type of lamp uses fluorescence to produce visible light?

Fluorescent lamp (A) Signup and view all the answers

What is the typical luminous efficacy of fluorescent lighting systems?

Around 100 lumens per watt (D) Signup and view all the answers

Why are fluorescent lamp fixtures more costly than incandescent lamps?

They require a ballast to regulate current (C) Signup and view all the answers

What is the luminous efficacy of an incandescent bulb?

Around 20 lumens per watt (C) Signup and view all the answers

What type of light does a fluorescent lamp produce to excite the phosphor coating?

Ultraviolet light (D) Signup and view all the answers