[D2L] 104B Controls Components

Question 1

What is a pressure controller?

Answer 1

Converts a pressure signal to electronic

Question 2

What is a flow (sail) switch used to control?

1) air
2) water
3) fluid flow
4) all of the above

Answer 2

All of the above

Question 3

What type of control system are relays and contactors considered?

Answer 3

electromechanical

Question 4

Relays are used when the electrical loads are rated 15 amps and over

Answer 4

False,

Relays are rated 15 amps and under
Contactors are rated 15 amps and over

Question 5

On a call for cooling R to Y closes in the thermostat which also sends power to G

Answer 5

True

Question 6

Enthalpy controllers measure the actual heat content of the air

Answer 6

True

Question 7

Relays are serviceable

Answer 7

False, you would rather replace it

Question 8

Contactors are used to switch high current and high voltage

Answer 8

True

Question 9

What type is a timer?

1) electromechanical
2) electronic
3) thermostat
4) both A & B

Answer 9

A & B

Question 10

What device is used to protect end use devices only?

Answer 10

Overload device

Question 11

What is the difference between a line duty and pilot duty overload device?

Answer 11

Pilot duty interrupts the control current and line duty interrupts the line current

Question 12

A fuse is an example of what kind of device?

Answer 12

overcurrent protection