Texas HVAC Practice Test (Free)

Question 1

In a standard gas furnace, what is the primary role of the heat exchanger?

Accepted Answer

To transfer heat from combustion gases to the circulating air without mixing the two airstreams

Answer

To ignite the burner assembly

Answer

To filter dust out of the return air

Answer

To regulate blower motor speed

Question 2

Under EPA refrigerant regulations, what is the primary purpose of a recovery machine when servicing an air conditioning system?

Accepted Answer

To remove refrigerant from a system and store it so it is not released into the atmosphere

Answer

To clean condenser coils using compressed air

Answer

To add extra refrigerant charge to boost cooling capacity

Answer

To measure the ambient humidity in the equipment room

Question 3

In Texas, under EPA Section 608, which certification type is required to service small appliances containing refrigerant, such as household refrigerators?

Accepted Answer

Type I

Answer

Type II

Answer

Type III

Answer

Universal only

Question 4

Which EPA Section 608 certification is required to service or dispose of high-pressure appliances, such as split residential air conditioning systems?

Accepted Answer

Type II

Answer

Type III

Answer

No certification is required

Answer

Type I

Question 5

A technician measures high superheat at the evaporator outlet of an air conditioning system. What does this most commonly indicate?

Accepted Answer

The system may be undercharged or has restricted refrigerant flow to the evaporator

Answer

The condenser fan motor has failed

Answer

The thermostat is miscalibrated

Answer

The system is overcharged with refrigerant

Question 6

Which condition would most likely cause abnormally high subcooling readings at the condenser outlet?

Accepted Answer

An overcharged system or a restriction after the point of measurement

Answer

An undercharged system

Answer

A dirty evaporator coil only

Answer

Low outdoor ambient temperature only

Question 7

In Texas, what is the purpose of a limit switch on a gas furnace?

Accepted Answer

To shut down the burners if the heat exchanger overheats

Answer

To start the compressor

Answer

To measure outdoor humidity

Answer

To control the thermostat display

Question 8

Why is proper venting critical on a gas-fired furnace?

Accepted Answer

It safely removes combustion byproducts, including carbon monoxide, to the outdoors

Answer

It increases the efficiency of the blower motor

Answer

It reduces the cost of the gas valve

Answer

It improves the appearance of the installation

Question 9

In Texas, in the basic refrigeration cycle, what is the primary function of the compressor?

Accepted Answer

To raise the pressure and temperature of the refrigerant vapor so it can release heat at the condenser

Answer

To lower the pressure and temperature of the refrigerant vapor

Answer

To meter the exact amount of liquid refrigerant entering the evaporator

Answer

To filter moisture and debris out of the refrigerant

Question 10

In Texas, where does the refrigerant absorb heat from the conditioned space in a typical air conditioning system?

Accepted Answer

In the evaporator coil

Answer

In the liquid line

Answer

In the condenser coil

Answer

In the compressor

Texas HVAC Practice Test

Question 1

In a standard gas furnace, what is the primary role of the heat exchanger?

Question 2

Under EPA refrigerant regulations, what is the primary purpose of a recovery machine when servicing an air conditioning system?

Question 3

In Texas, under EPA Section 608, which certification type is required to service small appliances containing refrigerant, such as household refrigerators?

Question 4

Which EPA Section 608 certification is required to service or dispose of high-pressure appliances, such as split residential air conditioning systems?

Question 5

A technician measures high superheat at the evaporator outlet of an air conditioning system. What does this most commonly indicate?

Question 6

Which condition would most likely cause abnormally high subcooling readings at the condenser outlet?

Question 7

In Texas, what is the purpose of a limit switch on a gas furnace?

Question 8

Why is proper venting critical on a gas-fired furnace?

Question 9

In Texas, in the basic refrigeration cycle, what is the primary function of the compressor?

Question 10

In Texas, where does the refrigerant absorb heat from the conditioned space in a typical air conditioning system?

Question 11

A gas furnace repeatedly trips its high-limit switch shortly after startup. What is the most likely underlying cause?

Question 12

What is the main purpose of an expansion device, such as a thermostatic expansion valve (TXV), in a refrigeration circuit?