HVAC Contractor Test 5
Heat exists down to absolute zero which is measured at a temperature of? -
--460 degrees F
- Appliance vent connectors and joints may be securely joined with? - -
Sheet metal screws
- At what degress fahrenheit below the desired evaporator outside surface
temperatures should the cut out pressure of a pressure motor control be set?
- -10 degrees
- Commercial air-cooled outdoor condenser units REQUIRE approximately
how many CFM of condenser air circulation per horesepower? - -1,000 CFM
- Copper or brass pipe joints of iron pipe size shall be of approved threaded,
flanged, or brazed types. The tubing joints and connections shall be
approved flared, lapped, swaged, or brazed joints, but shall NOT be of
________ type? - -Compression
- Mechanical room ventilation shall be designed to maintain what condition
within the room? - -Negative pressure
- Where infrared heaters are installed, the minimun CFM of ventilation air
per 1,000 Btu/h input shall be? - -4
- Rafrigeration machinery rooms shall be provided with a continuous source
of outside air for ventilation and removal of rejected heat. The exhaust
system shall continuously maintain the refrigeration machinery room at
______ water guage negative relative to adjacent spaces? - -0.05 inche
- Vertical refrigerant lines in commerical refrigeration should be sized to
maintain a velocity of? - -1,000 to 1,500 ft/min
- How long MUST employee injury and incident reports forms be retained? -
-Five years
- What determines the temperature at which a refrigerant wil vaporized? - -
Pressure
- It is the responsibilities of the contracting company that the following
information: "Regulated by the Texas Department of Licensing and
Regulation, P.O. Box 12157, Austin, Texas, 1-888-803-9202, 512-463-6599,
, www.license.state.tx.us" must be listed on which of the following? - -
Proposals and invoices
- According to the Texas Air Conditioning and Refrigeration Administrative
Rules, which of the following can be performed by a non licensed person? - -
Install, repair, or remove a vent hood (remove mold from a duct)
- What divides the point between high and low pressure refrigerants? - -
Evaporator inlet
- No portion of a venting system shall extend into or pass through any
________? - -Circulating air duct or furnace plenums
- A listed appliance's clearance from combustable material is less than the
code required clearance. If the appliance is installed to its listed clearnace,
the installation will be? - -Approved
- If an HVAC system frequently turns off and on without running the
complete programmed cycle, the technician locate thermostat for inspection.
A thermostat that is exposed to vibration may cause the system to _______? -
-Short cycle
- Slowing the velocity of water through an evaporator will have what effect
on the heat transfer? - -Decrease
- The total heat load consists of the amount of heat to be removed from a
cabinet during certain period, and is the sum of various heat loads per what
unit of time? - -24 hours
- Type IV and V systems in a dry cleaning plant shall be provided with an
automatically activated exhaust ventilation system capable oi maintaining a
MINIMUN of how many feet per minute of air velocity through the loading
door when the door is opened? - -100 fpm
- The amount of heat conducted through a structure for a given unit of time
is referred to as the ? - -U valve
- According to the International Mechanical Code, within how many working
business days after emergency equipment or appliance replacements/repairs
must a permit application be submitted? - -1
- In a medium temperature application, the major resistance to heat transfer
in the evaporator is the film of refrigerant oil. How may this be reduced? - -
Adjusting the super-heat
Heat exists down to absolute zero which is measured at a temperature of? -
--460 degrees F
- Appliance vent connectors and joints may be securely joined with? - -
Sheet metal screws
- At what degress fahrenheit below the desired evaporator outside surface
temperatures should the cut out pressure of a pressure motor control be set?
- -10 degrees
- Commercial air-cooled outdoor condenser units REQUIRE approximately
how many CFM of condenser air circulation per horesepower? - -1,000 CFM
- Copper or brass pipe joints of iron pipe size shall be of approved threaded,
flanged, or brazed types. The tubing joints and connections shall be
approved flared, lapped, swaged, or brazed joints, but shall NOT be of
________ type? - -Compression
- Mechanical room ventilation shall be designed to maintain what condition
within the room? - -Negative pressure
- Where infrared heaters are installed, the minimun CFM of ventilation air
per 1,000 Btu/h input shall be? - -4
- Rafrigeration machinery rooms shall be provided with a continuous source
of outside air for ventilation and removal of rejected heat. The exhaust
system shall continuously maintain the refrigeration machinery room at
______ water guage negative relative to adjacent spaces? - -0.05 inche
- Vertical refrigerant lines in commerical refrigeration should be sized to
maintain a velocity of? - -1,000 to 1,500 ft/min
- How long MUST employee injury and incident reports forms be retained? -
-Five years
- What determines the temperature at which a refrigerant wil vaporized? - -
Pressure
- It is the responsibilities of the contracting company that the following
information: "Regulated by the Texas Department of Licensing and
Regulation, P.O. Box 12157, Austin, Texas, 1-888-803-9202, 512-463-6599,
, www.license.state.tx.us" must be listed on which of the following? - -
Proposals and invoices
- According to the Texas Air Conditioning and Refrigeration Administrative
Rules, which of the following can be performed by a non licensed person? - -
Install, repair, or remove a vent hood (remove mold from a duct)
- What divides the point between high and low pressure refrigerants? - -
Evaporator inlet
- No portion of a venting system shall extend into or pass through any
________? - -Circulating air duct or furnace plenums
- A listed appliance's clearance from combustable material is less than the
code required clearance. If the appliance is installed to its listed clearnace,
the installation will be? - -Approved
- If an HVAC system frequently turns off and on without running the
complete programmed cycle, the technician locate thermostat for inspection.
A thermostat that is exposed to vibration may cause the system to _______? -
-Short cycle
- Slowing the velocity of water through an evaporator will have what effect
on the heat transfer? - -Decrease
- The total heat load consists of the amount of heat to be removed from a
cabinet during certain period, and is the sum of various heat loads per what
unit of time? - -24 hours
- Type IV and V systems in a dry cleaning plant shall be provided with an
automatically activated exhaust ventilation system capable oi maintaining a
MINIMUN of how many feet per minute of air velocity through the loading
door when the door is opened? - -100 fpm
- The amount of heat conducted through a structure for a given unit of time
is referred to as the ? - -U valve
- According to the International Mechanical Code, within how many working
business days after emergency equipment or appliance replacements/repairs
must a permit application be submitted? - -1
- In a medium temperature application, the major resistance to heat transfer
in the evaporator is the film of refrigerant oil. How may this be reduced? - -
Adjusting the super-heat
