Question 1

Some commercial and industrial high-voltage equipment uses transformers that drop the line voltage to 240 or 120 volts.

Accepted Answer

Transformers are used in commercial and industrial settings to step down high-voltage line power to more usable levels such as 240 or 120 volts for equipment and appliances.

Question 2

In a remote bulb thermostat, the pressure exerted by the diaphragm on the mechanical linkage will open and close a set of ____________________.

Accepted Answer

contacts

Question 3

The temperature in any structure, regardless of its age, location, or design, can be maintained at comfortable levels with a(n) ____________________.

Accepted Answer

thermostat

Question 4

In a remote bulb thermostat, as the temperature of the ____________________ changes, as will the pressure exerted on the diaphragm.

Accepted Answer

The answer of In a remote bulb thermostat, as the...

Question 5

What is the basic function of a thermostat?

Accepted Answer

The answer of What is the basic function of a...

Question 6

The line voltage thermostat is usually simpler than its low voltage counterparts because it has less functions to perform.

Accepted Answer

Line voltage thermostats are generally simpler because they directly control the power to the heating system, whereas low voltage thermostats often have more features and can control more complex systems.

Question 7

The ____________________ thermostat is commonly used to control the temperature of any medium, whether liquid or vapor, in many applications.

Accepted Answer

The answer of The ____________________ thermostat is commonly used to...

Question 8

Transformers are 100% efficient.

Accepted Answer

Transformers are not 100% efficient; they experience losses primarily due to ohmic heating in the coils and magnetic losses in the core.

Question 9

Transformers are rated by their primary voltage, secondary voltage, and volt-amperes (VA).

Accepted Answer

Transformers are rated by their primary voltage (input voltage), secondary voltage (output voltage), and volt-amperes (VA), which represents the transformer's apparent power capacity.

Question 10

The ____________________ element of a thermostat is the part that moves when a change in temperature is sensed.

Accepted Answer

The answer of The ____________________ element of a thermostat is...

Question 11

The ____________________ thermostat is used on control systems with a 24-volt supply.

Accepted Answer

The answer of The ____________________ thermostat is used on control...

Question 12

The bimetal thermostat derives its name from the fact that it uses three similar metals.

Accepted Answer

A bimetal thermostat uses two different metals bonded together, not three, which expand at different rates to operate a switch.

Question 13

What is the difference between a step-down transformer and a step-up transformer?

Accepted Answer

The answer of What is the difference between a step-down...

Question 14

What are the two ways bimetal thermostats have of making a good connection when the thermostat closes?

Accepted Answer

The answer of What are the two ways bimetal thermostats...

Question 15

What are the two windings associated with a transformer?

Accepted Answer

The answer of What are the two windings associated with...

Question 16

The transformer in a heating or cooling system provides the low-voltage power source for the control circuit.

Accepted Answer

The transformer in a heating or cooling system steps down the high voltage to a lower voltage (typically 24V) to safely power the control circuit, including thermostats and relays.

Question 17

A heating thermostat closes on a(n) ____________________ in temperature.

Accepted Answer

The answer of A heating thermostat closes on a(n) ____________________...

Question 18

The transformer for a residential unit is used to convert line voltage to 24 volts.

Accepted Answer

Residential transformers typically convert the higher line voltage (often around 120V or 240V depending on the country) to a lower voltage, such as 24V, for use in low-voltage applications like thermostats and doorbell systems.

Question 19

Most residential and small commercial installations use a 12-volt control system.

Accepted Answer

Most residential and small commercial installations typically use a 24-volt control system for HVAC and other control applications.

Question 20

____________________ are stationary inductive devices that transfer electric energy from one circuit to another by induction.

Accepted Answer

The answer of ____________________ are stationary inductive devices that transfer...

Quiz 11: Thermostats, Pressure Switches, and Other Electric Control Devices