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

Question 1

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

Answer 1

True

Question 2

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

Answer 2

contacts

Question 3

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

Answer 3

thermostat

Question 4

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

Question 5

What is the basic function of a thermostat?

Question 6

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

Question 7

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

Question 8

Transformers are 100% efficient.

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

What are the two windings associated with a transformer?

Question 16

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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