Electricity Unit 11 review

Which of the following is an advantage of using a digital thermostat over a mechanical thermostat?

• More accurate temperature control

• Easier to read display

• Many have programmable functions

• All of the choices are correct

Which of the following thermostat terminals will be used to control the second stage of cooling in a staged system?

• Y1

• Y2

• W2

• X2

A heating and cooling system that can operate at partial heating or cooling capacity in times of low load and full capacity when needed is known as a (a)   .

• Part-load system

• Dual system

• Staged system

• Hybrid system

A high-pressure switch is usually used to _________________________________?

• Turn the compressor on when the discharge pressure rises to the correct level

• Protect the compressor from damage caused by low suction pressure

• Protect the condenser fan motor from damage caused by excessive discharge temperatures

• Protect the compressor and system from excessively high discharge pressure

A thermostat that can be linked to the internet giving it the ability to communicate with smart phones, tablets, and computers is known as a _______________________.

• Wi-fi thermostat

• Smart thermostat

• Digital thermostat

• Programmable thermostat

An electrical device that opens and closes a set of contacts when a certain pressure is applied to the diaphragm refers to a _______________________.

• Pressure switch

• Thermostat

• Relay

• Circuit breaker

An electrical device that responds to changes in temperature by opening and closing describes a (a)   ?

• Thermostat

• Pressure switch

• Thermistor

• Rheostat

An electro-magnetic coil that produces a magnetic field to pull a steel core into the field to open or close a valve best describes a(n) (a)   .

• Solenoid valve

• Electronic actuator

• Pressure relief valve

• Service valve

Electronic thermostats sense the temperature by using a semiconductor device called a (a)   .

• Thermistor

• Thermocouple

• Transistor

Low-pressure switches are connected to the .​ (a)  

• Discharge side of the refrigeration system

• Liquid-line on the refrigeration system

• Condenser side of the refrigeration system
• Suction side of the refrigeration system