[D2L Practice] 104A-2

Question 1

What type of loop control is turning on a light in bedroom?

Answer 1

open loop (manual)

Question 2

Open loop controls are automatic

Answer 2

False, open loop is always manual

Question 3

What is a heat exchanger an example of?

1) controller
2) controlled device
3) control agent
4) process plant

Answer 3

process plant

Question 4

Closed loop controls are automatic

T or F

Answer 4

True

Question 5

A motion sensor controlling a light in a room is an example of closed loop

Answer 5

True

Question 6

What is the thermostat in a closed system?

Answer 6

controller

Question 7

What is the actuator in a closed loop furnace system?

Answer 7

gas valve solenoid

Question 8

What is the control agent in a residential furnace?

Answer 8

natural gas

Question 9

What tells a residential furnace to shut off?

Answer 9

thermostat

Question 10

If the thermostat is calling for cooling and you read 24v between R and Y which component is running?

Answer 10

Nothing, the switch is open

Question 11

If 0v is measured between R and Y what components should be running?

1) Indoor blower
2) air conditioning
3) heating
4) A & B

Answer 11

A & B

Indoor blower
air conditioning

Question 12

Furnace will be heating if 24v is measured across R and W

Answer 12

False, the switch is open

Question 13

Pneumatic controls use clean dry compressed air to operate

T or F

Answer 13

True

Question 14

What kind of control(s) do most RTU (roof top unit) use?

1) Electronic
2) Electromechanical
3) Both

Answer 14

Both electronic & electromechanical