Thermostats

Multiple Choice

Why is it important for appliances to have a thermostat?

• To regulate temperature and improve safety

• To increase the size of the appliance

• To make appliances more expensive

• To reduce the lifespan of the appliance

Multiple Choice

Which of the following is NOT a type of thermostat listed in the presentation?

• Rod and tube thermostats

• Liquid expansion thermostats

• Digital thermostats

• Vapour pressure thermostats

Open Ended

Explain the difference between snap acting and modulating thermostat functions.

Fill in the Blank

Fill in the blank: In a rod and tube thermostat, the outer tube and inner rod are fixed at one ___.

Multiple Select

Which components are present in the graduating rod and tube thermostat diagram?

• Bypass

• Valve

• Return spring

• Mercury switch

Multiple Choice

What is the main function of the spring steel disc in the snap action thermostat (cold position)?

• To regulate gas flow

• To act as a temperature sensor

• To provide pressure points for switching

• To expand with heat

Open Ended

Explain how the expansion of liquids is used to control gas flow in a bellows system.

Multiple Choice

Which component in a liquid expansion thermostat is responsible for opening and closing the valve as the temperature changes?

• Bellows

• Phial

• Capillary tube

• Bypass

Multiple Choice

When the temperature increases in a vapour pressure thermostat, what happens to the gas pressure in the sensing bulb?

• It increases

• It decreases

• It stays the same

• It fluctuates randomly

Multiple Select

Select all the components that are present in both the liquid expansion thermostat and the vapour pressure thermostat diagrams.

• Bellows

• Valve

• Sensing bulb

• Bypass

Fill in the Blank

Bimetal thermostats use two different ___ bonded together to respond to temperature changes.

Open Ended

Describe the function of the bimetal spiral in a bi-metal thermostat and how it contributes to temperature regulation.

Multiple Choice

Which of the following best describes the function of a thermistor in a heating system?

• It acts as a switch to turn the burner on and off.

• It measures temperature by changing its resistance.

• It directly controls the flow of gas to the burner.

• It expands and contracts to regulate temperature.

Open Ended

Explain the differences between at least two types of thermostats listed in the summary, and discuss how their mechanisms regulate temperature.

Multiple Choice

Which of the following is NOT a function of a thermostat?

• To regulate the temperature by controlling the flow of gas to the burner

• To add to the convenience, utility, and safety of the appliance

• To increase the speed of the burner regardless of temperature

• To improve the economy of the appliance