Which component in a thermal relay is responsible for detecting temperature changes?
Bimetallic element
The correct answer is Bimetallic element.
A thermal relay uses a bimetallic element as its temperature sensing component. A bimetallic element is a strip of metal composed of two different metals with different coefficients of thermal expansion. When the temperature changes, one metal expands or contracts more than the other, causing the strip to bend. This bending action is used to activate or deactivate the relay's contacts.
Let's examine why the other options are incorrect:
- Electromagnet: Electromagnets are used in many relays, but not for temperature sensing. They are used to actuate the contacts based on an electrical signal.
- Transformer: Transformers are used for changing voltage levels, not for sensing temperature.
- Resistor: While resistors can change their resistance with temperature (thermistors), a typical thermal relay uses a bimetallic element for its direct mechanical action in response to temperature change.
Therefore, the bimetallic element is the key component responsible for detecting temperature changes within a thermal relay.
Similar Questions
Eddy current proximity sensors can detect _______.
Burglar alarm circuits consist of
What happens to the resistance of an RTD with an increase in temperature?
An industrial engineer wants to optimize a photoelectric switch system for detecting various packages on a conveyor belt, where the packages differ in shape, color, and surface reflectivity. Which of the following changes would most improve the switch's detection reliability for all package types?
What is the main function of the sensors in an IoT system?
Which of the following is NOT a sensor performance characteristic?
Which of the following is a primary criterion when choosing a sensor for monitoring temperature in a manufacturing process?
An LVDT is used for measuring _________.
- Which component of an industrial automation system directly converts physical parameters into electrical signals for processing?
What is the working principle of an LVDT?
Important Questions from Sensors Transducers and Applications
A piezo-resistive pressure sensor gives an output of 6 mV when excited with 5 V. If its sensitivity is 2 mV/V/kPa, the pressure measured is
An LVDT is used to measure displacement. The LVDT feeds a voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement of 0.5 mm, the output of LVDT is 2 mV. The sensitivity of the instrument is
Capacitive transducers are normally used for:
Shaft encoder is used to measure:
A transducer’s function in general is to _______.
