QuestionJuly 24, 2025

Which of the following is a control device? Thermostat Relay Contactor Sequencer

Which of the following is a control device? Thermostat Relay Contactor Sequencer
Which of the following is a control device?
Thermostat
Relay
Contactor
Sequencer

Solution
4.3(279 votes)

Answer

Thermostat, Relay, Contactor, Sequencer (All are control devices) Explanation 1. Identify Control Devices A control device is used to manage the operation of a system or process. All listed options are control devices, but they serve different purposes. 2. Define Each Device - **Thermostat**: Regulates temperature by switching heating/cooling systems on/off. - **Relay**: Electrically operated switch used for controlling circuits. - **Contactor**: Similar to a relay but designed to handle higher power loads. - **Sequencer**: Controls the order in which operations occur, often in HVAC systems.

Explanation

1. Identify Control Devices<br /> A control device is used to manage the operation of a system or process. All listed options are control devices, but they serve different purposes.<br /><br />2. Define Each Device<br /> - **Thermostat**: Regulates temperature by switching heating/cooling systems on/off.<br /> - **Relay**: Electrically operated switch used for controlling circuits.<br /> - **Contactor**: Similar to a relay but designed to handle higher power loads.<br /> - **Sequencer**: Controls the order in which operations occur, often in HVAC systems.
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