Electrical Switches and Throws

What does SPST stand for in electrical switches?

• Triple Pole, Single Throw

• Single Pole, Double Throw

• Single Pole, Single Throw

• Double Pole, Double Throw

Answer explanation

SPST stands for Single Pole, Single Throw, which is the correct choice for electrical switches.

How many poles and throws does a DPST switch have?

• 1 pole and 1 throw

• 4 poles and 2 throws

• 3 poles and 3 throws

• 2 poles and 2 throws

Answer explanation

A DPST switch has 2 poles and 2 throws, allowing for two separate circuits to be controlled by the switch.

What is the function of a SPDT switch?

• It can connect two inputs to one output.

• It has no specific function.

• It can connect one input to multiple outputs.

• It can connect one input to one of two outputs.

Answer explanation

The function of a SPDT switch is to connect one input to one of two outputs.

Explain the working of a DPDT switch.

• A DPDT switch has only two terminals and can control one circuit.

• A DPDT switch has four terminals and can control three separate circuits.

• A DPDT switch has six terminals and can control two separate circuits.

• A DPDT switch has eight terminals and can control four separate circuits.

Answer explanation

A DPDT switch has six terminals, allowing it to control two separate circuits, making the third option the correct choice.

What is the purpose of a three-way switch?

• To control the temperature of a room

• To turn on and off multiple appliances at the same time

• To control a single light or set of lights from two different locations

• To operate a ceiling fan

Answer explanation

The purpose of a three-way switch is to control a single light or set of lights from two different locations.

What type of circuit is commonly used with SPST switches?

• Simple circuit

• Series circuit

• Parallel circuit

• Complex circuit

Answer explanation

SPST switches are commonly used in simple circuits, making the correct answer choice 'Simple circuit'.

Compare and contrast DPST and SPDT switches.

• DPST switches have one circuit and three terminals, while SPDT switches have two separate circuits and four terminals.

• DPST switches have one circuit and two terminals, while SPDT switches have one circuit and three terminals.

• DPST switches have one circuit and four terminals, while SPDT switches have two separate circuits and three terminals.

• DPST switches have two separate circuits and four terminals, while SPDT switches have one circuit and three terminals.

Answer explanation

DPST switches have two separate circuits and four terminals, while SPDT switches have one circuit and three terminals.

How is a DPDT switch different from a three-way switch?

• A DPDT switch and a three-way switch are the same and can be used interchangeably.

• A DPDT switch is used for low voltage applications, while a three-way switch is used for high voltage applications.

• A DPDT switch has six terminals and can control two separate circuits, while a three-way switch has three terminals and is used to control a single fixture from two different locations.

• A DPDT switch has only three terminals and can control a single circuit, while a three-way switch has six terminals and is used to control two separate fixtures.

Answer explanation

A DPDT switch has six terminals and can control two separate circuits, while a three-way switch has three terminals and is used to control a single fixture from two different locations.

What are the applications of SPDT switches?

• Only used in industrial applications

• None of the above

• Limited to residential use only

• All of the above

Answer explanation

The correct answer is 'All of the above' because SPDT switches can be used in industrial, residential, and various other applications.

Discuss the wiring of a three-way switch.

• The wiring of a three-way switch involves connecting the common terminal to the power source, and the traveler terminals to the light fixture and the other three-way switch.

• The wiring of a three-way switch involves connecting the common terminal to the light fixture, and the traveler terminals to the power source and the other three-way switch.

• The wiring of a three-way switch involves connecting the common terminal to the ground, and the traveler terminals to the power source and the light fixture.

• The wiring of a three-way switch involves connecting the common terminal to the light fixture, and the traveler terminals to the ground and the other three-way switch.

Answer explanation

The correct wiring of a three-way switch involves connecting the common terminal to the power source, and the traveler terminals to the light fixture and the other three-way switch.