Deck 16: Electronic Controls

Question 1

Heating thermostat contacts close on a temperature rise.

Answer 1

False

Question 2

Sensing bulbs on thermostats are filled with which type of liquid?

A) water
B) volatile
C) nitrogen
D) carbon dioxide

Answer 2

B

Question 3

Which type of sensors do electronic thermostats use?

A) sensing bulb
B) bimetal
C) thermistors
D) all of the above

Answer 3

C

Question 4

Low-voltage thermostats usually control which type of voltage?

A) 24
B) 115
C) 220
D) all of the above
E) both b and c

Question 5

It is possible to have a control relay with a 24-volt coil and 220-volt contacts.

Question 6

Cooling anticipators are wired in series with the thermostat contacts.

Question 7

__________ controls are desirable for efficient system operation.

A) Dual-pressure
B) Electronic
C) High-pressure
D) Low-pressure

Question 8

Heating anticipators are wired in series with the thermostat contacts.

Question 9

A thermostat that can control multiple levels of heating and cooling is called a/an ____ thermostat.

A) isolating
B) zoning
C) setback
D) staging

Question 10

How are control transformers rated?

A) volts
B) volt-amps
C) amps
D) watts

Question 11

Contactors are large relays and are used to control the operation of loads that draw more than ____ amps.

A) 5
B) 10
C) 15
D) 20

Question 12

An overload protector is usually wired in series with the motor's _________ winding.

A) start
B) run
C) common

Question 13

Cooling thermostat contacts close on temperature rise.

Question 15

Limit switches are usually normally open switches.

Question 16

Which voltage do line voltage thermostats usually control?

A) 24
B) 115
C) 220
D) all of the above
E) both b and c

Question 17

Which anticipators are adjustable?

A) heating
B) cooling
C) both
D) neither

Question 18

At the beginning of the heat cycle, the heat exchanger found on heating systems is cool and the fan switch will be in the closed position.

Question 19

Limit switches are usually found on which type of systems?

A) heating
B) cooling
C) both a and b
D) neither a nor b

Question 20

The component of a low-voltage thermostat assembly that the low-voltage wires are connected to is called a __________.

Question 24

List three types of thermostat mechanisms.