HVAC serving Test 1 (week 1)

How do you calculate net oil pressure? 

• Oil pump outlet pressure - Suction pressure

• Liquid line- suction pressure

What is the easiest way to check and see if there is control voltage present at the thermostat? 

• Check the voltage supplied to the transformer primary 

• Check the voltage at the transformer secondary

• Turn the fan switch to the on position. 

What is a low pressure switch in the high side of a refrigeration system called? 

• valve

• Loss of charge switch

• hard lockout switch

List the six components that make up low voltage thermostats. 

• Electrical Contacts

• Heat Anticipator

• Cold Anticipator

• Thermostat Cover

• Thermostat Assembly

What are the three types of automatic controls?

• -Thermostat

  -Fan limit switch

  -High/low pressure controls

• Electrical

  Mechanical

  Electro-Mechanical

What devices are normally used when measuring or controlling the pressure of refrigerants, air, gas and water?

• Pressure-sensing

• Pressure Control

• fan limit switch

• Fan motor

What is the function of a water pressure regulatior?

• It is used for regulating system pressure and regulating heat pressure control in water cooled refrigeration sytems.

• a device within your furnace that detects when the internal temperature is too high and turns the unit off as a safety measure.

• a component in the condensing unit of an HVAC system, which is located outdoors. It has a significant effect on the comfort level in your home

The recommended repair for a defective relay is to __________.

• replace it

• repair it yourself

• send it to a repair shop

• bypass it

When rebuilding a contactor or starter, which of the following components can be changed?

• The contacts and springs only

• The contacts, coil, and springs

• The coil and contacts only

• The contacts and coil only

The two types of relays are ______.

• thermal and magnetic

• motor starting and solder pot

• pilot duty and solder pot

• pilot duty and motor starting