EC ( Control Circuits) Ch12

Question 1

What are the five components that provide input to an electrical control circuit?

Answer 1

• Push Button Switch
• Limit Switch
• Proximity Sensor
• Pressure Switch
• Temperature Sensor (Thermocouple or RTD)

These components detect conditions and send signals to the control system.

Question 2

What is the basic flow of an electrical control circuit?

Answer 2

• Input Devices (Sensors or Switches)
• Logic Components (Relays, Timers, or PLC)
• Output Devices (Actuators, Motors, Lights)

Input devices provide information, logic components process the inputs, and output devices perform an action.

Question 3

What is the role of input devices in an electrical control circuit?

Answer 3

Provide information

Input devices include sensors or switches.

Question 4

What do logic components do in an electrical control circuit?

Answer 4

Process the inputs based on programmed or wired logic

Examples include relays, timers, or PLC.

Question 5

What is the function of output devices in an electrical control circuit?

Answer 5

Perform an action

Output devices can be actuators, motors, or lights.

Question 6

In an example circuit flow, what are the input devices used?

Answer 6

• Start push button (NO)
• Limit switch

The start push button is normally open (NO).

Question 7

In an example circuit flow, what is the logic component?

Answer 7

Control relay coil (CR1)

This component processes the input signals.

Question 8

In an example circuit flow, what is the output device?

Answer 8

Motor contactor (M)

This device performs the action based on the logic component.

Question 9

What does the left-hand vertical column of a ladder logic diagram represent?

Answer 9

Power supply line (L1)

It is the source of voltage from which current flows through the rungs of the circuit.

Question 10

What happens when both the start button and limit switch are closed?

Answer 10

CR1 is energized

This action closes the contact and energizes the motor contactor coil.

Question 11

Fill in the blank: The component that detects the position or movement of a part is called a _______.

Answer 11

Limit Switch

This component is essential for feedback in control systems.

Question 12

True or False: A proximity sensor detects objects through physical contact.

Answer 12

False

A proximity sensor detects objects without physical contact.