Thermostat Reading Answers

Jul 16, 2025

Thermostat Reading Answers is an academic reading answers topic. Thermostat Reading Answers has a total of 7 IELTS questions in total. In the question set, you have to state whether the statement is yes, no or not given according to the passage.

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Topic:

THERMOSTAT

A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near desired set point.

Thermostats are used in any device or system that heats or cools to a set point temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment, including ovens and refrigerators and medical and scientific incubators. In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States.

A thermostat operates as a "closed-loop" control device, as it seeks to reduce the error between the desired and measured temperatures. Sometimes a thermostat combines both the sensing and control action elements of a controlled system, such as in a motorised thermostat. Thermostats use different types of sensors to measure the temperature. In one form, the mechanical thermostat, a bimetallic strip in the form of a coil directly operates electrical contacts that control the heating or cooling source. Electronic thermostats, instead, use a thermistor or other semiconductor sensor that requires amplification and processing to control the heating or cooling equipment.

A thermostat is an example of a "bang-bang controller" as the heating or cooling equipment output is not proportional to the difference between actual temperature and the temperature set point. Instead, the heating or cooling equipment runs at full capacity until the set temperature is reached, then shuts off. Increasing the difference between the thermostat setting and the desired temperature, therefore, does not change the time to achieve the desired temperature. The rate at which the target system temperature can change is determined both by the capacity of the heating or cooling equipment to respectively add or remove heat to or from a target system and the capacity of the target system to store heat.

To prevent excessively rapid cycling of the equipment when the temperature is near the set point, a thermostat can include some hysteresis. Instead of changing from "on" to "off" and vice versa instantly at the set temperature, a thermostat with hysteresis will not switch until the temperature has changed a little past the set temperature point. For example, a refrigerator set to 20 °C might not start the cooling compressor until its food compartment's temperature reaches 30 °C, and will keep it running until the temperature has been lowered to 1 °C.

This reduces the risk of equipment wear and tear from repeated switching, although it introduces a target system temperature Oscillation of a certain magnitude. To improve the comfort of the occupants of heated or air-conditioned spaces, bimetal sensor thermostats can include an "anticipator" system to slightly warm the temperature sensor while the heating equipment is operating, or to slightly warm the sensor when the cooling system is not operating. When correctly adjusted, this reduces any excessive hysteresis in the system and reduces the magnitude of temperature variations. Electronic thermostats have an electronic equivalent.

Question 20–26

Do the following statements agree with the information given in the Reading Passage?

YES - If the statement agrees with the claims of the writer.

NO - If the statement contradicts the claims of the writer.

NOT GIVEN - If it is impossible to say what the writer thinks about this.

20. A thermostat works well in gadgets that are used for refrigeration than the devices used for heating.

Answer: NOT GIVEN

Explanation: No information is given about a thermostat working well in gadgets that are used for refrigeration, whereas the devices used for heating are given in the text.

21. A thermostat is used to keep the device's temperature sustained and close to an anticipated mark.

Answer: YES

Supporting statement: Thermostats are used in any device or system that heats or cools to a set point temperature,

Keywords: Thermostats, temperature

Keyword Location: Para 1, Line 1

Explanation: Any device or system which heats and cools a place or thing to a set temperature has a thermostat.

22. Thermostats are manually operated.

Answer: NO

Supporting statement: A thermostat operates as a "closed-loop" control device,

Keywords: closed-loop, control

Keyword Location: Para 2, Line 1

Explanation: According to the text, thermostats are not operated manually but by a closed-loop control device.

23. A heating or cooling apparatus is ceased by a thermostat when they get to a determined temperature.

Answer: YES

Supporting statement: Instead, the heating or cooling equipment runs at full capacity until the set temperature is reached, then shuts off.

Keywords: equipment, capacity

Keyword Location: Para 3, Line 3

Explanation: According to the text, until the desired temperature is reached, the heating or cooling device operates at maximum capacity before shutting off.

24. The rate in change of temperature in a target system depends on the quality and storage capacity of thermostat.

Answer: NO

Supporting statement: The rate at which the target system temperature can change is determined both by the capacity of the heating or cooling equipment

Keywords: target system, heating or cooling

Keyword Location: Para 3, Lines 6-7

Explanation: According to the text, the rate at which the target system temperature can change depends on the ability of heating or cooling equipment to add or remove heat from a target system, respectively, as well as the target system's capacity to store heat.

25. Until the temperature has adjusted slightly lower than the determined temperature point, a thermostat with hysteresis will not switch.

Answer: NO

Supporting statement: a thermostat with hysteresis will not switch until the temperature has changed a little past the set temperature point

Keywords: hysteresis, switch

Keyword Location: Para 4, Line 3

Explanation: According to the text, a thermostat with hysteresis will not switch until the temperature has gone up a little above the set temperature.

26. An equipment will wear out more rapidly if the switching rate of thermostat is too frequent

Answer: YES

Supporting statement: This reduces the risk of equipment wear and tear from repeated switching,

Keywords: wear and tear, switching

Keyword Location: Para 5, Line 1

Explanation: According to the text, the equipment might sustain some wear and tear due to repeated switching.

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