Hvac Practice Test Questions

Front 1

When Inspecting an installation of heating equipment, Make sure there is enough room for the proper functioning and _______ of all the Equipment

a. testing b. maintenance

c. cleaning d. installation

Back 1

b. maintenance

Front 2

Operation and maintenance instructions are usually posted on the _________ upon completion of the installation of heating equipment.

a. equipment b. ceiling

c. wall d. Door

Back 2

c. Wall

Front 3

When checking for boiler installation to pass examination by a code inspector, you should make sure the installation is correctly don in respect to the:

a. ICC Building Code b. National electrical code

c. Asme Code d. All of the above

Back 3

c. ASME Code

Front 4

When checking an installation of heating equipment so it will pass code inspection, it is best to make sure that:

a. the joints are tightly sealed

b. the air is clean

c. the water is clean

d. the mortar is dry

Back 4

a. the joints are tightly sealed

Front 5

The heat content of water is usually measured in:

a. BTU b. degrees

c. Celsius d. Fahrenheit

Back 5

a. BTU

Front 6

The five classes of steam-heating systems are high pressure, medium pressure, low pressure, vapor, and _______ systems.

a. vacuum b. air

c. suction d. blower

Back 6

a. vacuum

Front 7

A steam trap must be properly sized to handle the full load of:

a. steam b. hot water

c. cold water d. condensate

Back 7

d. condensate

Front 8

Water hammering is a phenomenon that occurs when __________ remaining in the pipe flashes into steam.

a. condensate b. cold water

c. hot water d. warm water

Back 8

a. Condensate

Front 9

Whenever a steam system is servicing an area whose out door temperature will drop below __________, the designer must make provisions to prevent freezing.

a. 32 degrees F b. 35 degrees F

c. 40 degrees F c. 10 degrees F

Back 9

b. 35 degrees F

Front 10

Which of the following is NOT a recommendation for minimizing freezing problems in steam systems?

a. installing a strainer before all heating units

b. oversize traps

c. keeping condensate lines as short as possible

d. where possible, not using overhead return

Back 10

b. Oversize Traps

Front 11

Unit heaters can be classified by:

a. type of air mover (either propeller or centrifugal blower)

b. air flow configuration (vertical or horizontal air delivery)

c. heating medium (steam, hot water, gas, oil, or electricity)

d. all of these

Back 11

d. all of these

Front 12

The disadvantage of the centrifugal blower fan unit heater is:

a. it has a generally quieter operation than a propeller type

b. it is less efficient than other types

c. it is ideal for use in spot welding areas

d. it has air discharge nozzles

Back 12

b. it is less efficient than other types

Front 13

Gas heating unit heaters must conform to local codes and requirements for type and volume of gas burned and pressure ______ allowed in the line.

a. drop b. relief

c. build-up d. increase

Back 13

a. drop

Front 14

Electric- heating unit heaters must conform to the local codes and the most often used:

a. National Electrical Code

b. International Code Council

c. National Plumbing Code

d. Electrical Engineers Code

Back 14

a. National Electrical Code

Front 15

An important point to consider with every heating medium is the change in ______ temperature.

a. entering air b. exiting air

c. inside air d. outside air

Back 15

a. entering air

Front 16

Appliances are classified as Category I and Category II. Category I appliances operate with a non-positive vent connection pressure and with a flue gas temperature of at least _____degrees F.

a. 180 b. 140

c. 212 d. 32

Back 16

b. 140

Front 17

Category II appliances operate with a non-positive vent connection pressure and with a flue gas temperature less than _____degrees F

Back 17

b. 140

Front 18

Hydronic piping sizes should be sized for the demand of the system. These systems are installed according to the_____.

a. International Plumbing Code

b. International Code Council

c. International Fuel Code

d. International Mechanical Code

Back 18

a. International Plumbing Code

Front 19

According to code, hydronic pipe should not be made of:

a. CPVC b. Copper

c. brass d. cast iron

Back 19

d. cast iron

Front 20

Hydronic piping should be insulated to the thickness required by the:

a. International Energy Conservation Code

b. International Mechanical Code

c. International Building Code

d. National Building Code

Back 20

a. International Energy Conservation Code

Front 21

Heat Exchangers were introduced in 1930 and since have gained wide acceptance. The heat exchanger is described as a viable means of transferring heat between liquids such as water to water and steam to water. Typical applications include:

a. Cooling tower and water cooling

b. free-cycling cooling

c. high rise pressure interceptor applications

d. all of the above

Back 21

d. all of the above

Front 22

The advantages of plate heat exchangers ofer other types of heat exchangers, such as shell-and-tube exchangers, include:

a. compact heat exchange

b. greater transfer efficiency

c. flexible design

d. all of the above

e. none of these

Back 22

d. all of the above

Front 23

During normal operation, the heat exchanger must also be protected against large solids and ______ surges.

a. electrical b. pressure

c. water d. liquid

Back 23

b. pressure

Front 24

Depending upon the nature of the transfer fluids and the application, performance of the heat exchanger may __________ over time.

a. upgrade b. degrade

c. improve d. explode

Back 24

b. degrade

Front 25

On-site cleaning of heat exchangers for encrusted scales and sedimentation include:

a. hot water

b. nitric, sulfuric, citric, and phosphoric acid

c. complexing agents such as EDTA or NTA

d. all of these

e. none of these

Back 25

d. all of these

Front 26

An alternative to external plate cleaning is on-site cleaning or cleaning in place (CIP). CIP is achieved by:

a. chemical or partial dissolving of the deposit through chelation or chemical dissol