HVAC contractor exam 8
A 100,000 BTU/h, Category IV has furnace the usage of one hundred% outdoor air furnished by
mechanical method requires what number of cubic ft of combustion air? - ANS-35
A 2,000-rectangular foot dry cleansing area utilising a Type II dry cleaning system requires a
MINIMUN exhaust air of - ANS-2,000 cfm
A boiler furnishing warm water Ar pressures now not exceeding 160-kilos per square inch and at
temperature no longer exceeding 250 ranges F, is described as: - ANS-Hot water heating boiler
A patron is requesting you to install a high warmness steel chimney of 18 inches in diameter.
For this activity you may want to apply sheet metal of_________ GA deep, AT LEAST. - ANS-12
GA
A contractor is covering on a gasoline piping in a wall. This pipe is NOT black or galvanized
steel. It is installed from edge of a stud and isn't the use of a protect. What ought to be the best
MINIMUN distance among the scholar the pipe? - ANS-1-half inches
A hydronic machine requires severa valves to function well. Additionally, an average hydronic
gadget consists of a selection of_________ valves to make sure that water flows in the proper
path through the gadget - ANS-Flow-control
A platform to provider system in an attic must extend___________. - ANS-In the the front of the
device
A residential rest room desires to be furnished with an intermittent exhaust. THE LEAST"cfm"
Allowed for this unique place is_________. - ANS-50 cfm
A technician is running on an outside wall doing some notching. This wall is of nominal 2"x6"
timber stud. This means this wall ought to be notched every _________ - ANS-1-three/eight
inches
About________ inches are the MINIMUN separation when working with a pressure tap of of an
three-inch fuel line and the MP gasoline regulator. - ANS-30 inches
According the International Mechanciak Code, all refrigerating piping, fittings, suction line, and
so on., during everyday operation, will attain a floor temperature underneath the dewpoint of the
encircling air, and are located in spaces or regions in which it could motive a protection danger.
Therefore insulation is used to____________. - ANS-Prevent condensation in these areas and
areas
According to Modern Refrigeration and Air Conditioning 2014 textbook policies and calculations,
what will be the duct friction lack of a gadget with the designed specification of:
, -0.80 IWC external static strain
-0.25 stress drop off the filter out
-zero.30 static strain drop of the evaporator coil
-zero.10 static strain drop of the deliver registers and return grilles - ANS-0.15
According to the IMC, on down-go with the flow HVAC Systems and all different coils that do not
have a secondary drain for provisions to install a secondary or auxiliary drain pan, a water-stage
monitoring device shall be installed_______. This tool shall shut off the gadget served in the
event that the primary drain becomes confined. - ANS-Inside number one drain pan
Air-transferring systems providing air ________ Per minute to enclosed spaces within buildings
will be geared up with an automated close off - ANS-Over 2,000 CFM
Air-transferring systems presenting air in excess of________ cubic toes in step with minute to
surround spaces inside homes will be geared up with an automatic shutoff. - ANS-2000 CFM
All of the following is needed and covered in the maintenance of air-conditioning and
refrigeration, except? - ANS-Installation or replacement of entire structures
An appliance is located in a constrained space with all air taken from the out of doors by to
vertical ducts. Each commencing for combustion will be at least one rectangular inch in keeping
with - ANS-four,000 BTU/H
An HVAC technician must NOT use_______ to pressurize appliances (n a refrigeration system)
To test for leaks, because whilst blended with compressor oil, an explosion may occur -
ANS-Oxygen
An R-19 insulated wall desires about ___________ of mineral wool. - ANS-6 inches
And approved guide shut off valve installed___________ all of the little device is on the primary
burner of a fuel-fired boiler - ANS-Upstream
Apply the "cfm" formula to clear up the subsequent: A duct measures forty inches through 22
inches and the air pace is 1,500 fpm - ANS-9,167 cfm
Avoid touch with contaminated lubricant from a airtight device this is grimy and scents terrible
due to the fact it may be - ANS-Acidic
Based at the calculation of Ohm's Law and the standards of electrical circuits, what would be
the voltage capability given a circuit that has a resistive load of eleven Ohms, and draws 22
amperes of current? - ANS-242
Choose the perfect description for scroll compressors: - ANS-There is less vibration than from a
reciprocating compressor
A 100,000 BTU/h, Category IV has furnace the usage of one hundred% outdoor air furnished by
mechanical method requires what number of cubic ft of combustion air? - ANS-35
A 2,000-rectangular foot dry cleansing area utilising a Type II dry cleaning system requires a
MINIMUN exhaust air of - ANS-2,000 cfm
A boiler furnishing warm water Ar pressures now not exceeding 160-kilos per square inch and at
temperature no longer exceeding 250 ranges F, is described as: - ANS-Hot water heating boiler
A patron is requesting you to install a high warmness steel chimney of 18 inches in diameter.
For this activity you may want to apply sheet metal of_________ GA deep, AT LEAST. - ANS-12
GA
A contractor is covering on a gasoline piping in a wall. This pipe is NOT black or galvanized
steel. It is installed from edge of a stud and isn't the use of a protect. What ought to be the best
MINIMUN distance among the scholar the pipe? - ANS-1-half inches
A hydronic machine requires severa valves to function well. Additionally, an average hydronic
gadget consists of a selection of_________ valves to make sure that water flows in the proper
path through the gadget - ANS-Flow-control
A platform to provider system in an attic must extend___________. - ANS-In the the front of the
device
A residential rest room desires to be furnished with an intermittent exhaust. THE LEAST"cfm"
Allowed for this unique place is_________. - ANS-50 cfm
A technician is running on an outside wall doing some notching. This wall is of nominal 2"x6"
timber stud. This means this wall ought to be notched every _________ - ANS-1-three/eight
inches
About________ inches are the MINIMUN separation when working with a pressure tap of of an
three-inch fuel line and the MP gasoline regulator. - ANS-30 inches
According the International Mechanciak Code, all refrigerating piping, fittings, suction line, and
so on., during everyday operation, will attain a floor temperature underneath the dewpoint of the
encircling air, and are located in spaces or regions in which it could motive a protection danger.
Therefore insulation is used to____________. - ANS-Prevent condensation in these areas and
areas
According to Modern Refrigeration and Air Conditioning 2014 textbook policies and calculations,
what will be the duct friction lack of a gadget with the designed specification of:
, -0.80 IWC external static strain
-0.25 stress drop off the filter out
-zero.30 static strain drop of the evaporator coil
-zero.10 static strain drop of the deliver registers and return grilles - ANS-0.15
According to the IMC, on down-go with the flow HVAC Systems and all different coils that do not
have a secondary drain for provisions to install a secondary or auxiliary drain pan, a water-stage
monitoring device shall be installed_______. This tool shall shut off the gadget served in the
event that the primary drain becomes confined. - ANS-Inside number one drain pan
Air-transferring systems providing air ________ Per minute to enclosed spaces within buildings
will be geared up with an automated close off - ANS-Over 2,000 CFM
Air-transferring systems presenting air in excess of________ cubic toes in step with minute to
surround spaces inside homes will be geared up with an automatic shutoff. - ANS-2000 CFM
All of the following is needed and covered in the maintenance of air-conditioning and
refrigeration, except? - ANS-Installation or replacement of entire structures
An appliance is located in a constrained space with all air taken from the out of doors by to
vertical ducts. Each commencing for combustion will be at least one rectangular inch in keeping
with - ANS-four,000 BTU/H
An HVAC technician must NOT use_______ to pressurize appliances (n a refrigeration system)
To test for leaks, because whilst blended with compressor oil, an explosion may occur -
ANS-Oxygen
An R-19 insulated wall desires about ___________ of mineral wool. - ANS-6 inches
And approved guide shut off valve installed___________ all of the little device is on the primary
burner of a fuel-fired boiler - ANS-Upstream
Apply the "cfm" formula to clear up the subsequent: A duct measures forty inches through 22
inches and the air pace is 1,500 fpm - ANS-9,167 cfm
Avoid touch with contaminated lubricant from a airtight device this is grimy and scents terrible
due to the fact it may be - ANS-Acidic
Based at the calculation of Ohm's Law and the standards of electrical circuits, what would be
the voltage capability given a circuit that has a resistive load of eleven Ohms, and draws 22
amperes of current? - ANS-242
Choose the perfect description for scroll compressors: - ANS-There is less vibration than from a
reciprocating compressor
