HVAC pre-test
A manage may be which of the following:
Electrical
Mechanical
Electrical and Mechanical
All of the above - ANS-All of the above
A contemporary magnetic relay opens and closes its contacts primarily based at the -
ANS-Current in the run winding
A direct growth type evaporator is also called a - ANS-dry-kind evaporator
A helicopter is lifting an 800 lb unit at a price of 200 ft/in keeping with min. How many
horsepower of work power is the helicopter using within the process - ANS-four.848 hp
A liquid fabric exerts a pressure or force - ANS-outward and downward
A micron gauge is used to degree - ANS-Absolute stress beneath 1 mm Hg
A motor's velocity is decided by using - ANS-Number of motor poles
A normally operating water cooled condenser is operating with a ten degree differential among
water in and water out. If the amount of 85 diploma water going thru the condenser is
decreased, which of the following is a likely temp of the water leaving the condenser?
Seventy five F
zero F
ninety five F
one hundred and five F - ANS-a hundred and five diploma F
A stable material exerts a strain or force - ANS-downward only
A split-phase has a _____ winding and a ______ winding - ANS-Start and Run winding
A split-phase motor can use a ____ to energize and de-energize the begin winding:
Potential Relay
Current Relay
Centrifugal Switch
All of the above - ANS-All of the above
A ton of refrigeration is identical to - ANS-288,000 btu/24-hr
, A regular evaporator working temperature inside the AC gadget is - ANS-40 diploma F
A traditional superheat fro an evaporator operating beneath regular conditions could be ______
- ANS-8-12 diploma F
A vapor material exerts a strain or pressure _______ - ANS-In all instructions
An instance of a power consuming tool could be a ____ whilst an instance of a non-energy
eating device would be a _____ - ANS-Light bulb, single pole single throw switch
At a steady pressure the extent of a gas varies as to absolutely the temperature and at a steady
quantity the stress of the gas varies without delay with the absolute temperature. This is called
_______ law - ANS-Charles Law
At what location or places in a refrigeration gadget does the saturation stress correspond to the
saturation temperature - ANS-Evaporator and Condenser
By layout, which of the subsequent air ducts will allow 250 cfm to glide with a velocity of 500
ft/min?
9"x8"
sixteen"x9"
10"x9"
None of those - ANS-9"x8"
Centrifugal chillers variety in length from __________ tons - ANS-a hundred to ten,000 lots
Comfort can be described as the mild balance among - ANS-Air cleanliness, air movement,
temperature, and humidity
High temperature refrigeration is that produced by way of - ANS-an air-conditioning system
How many BTU's are required to change 1 lb of ice at 20 ranges to steam at 220 ranges -
ANS-1304 btu/h
How many BTU's are required to trade 5 lbs of ice at 20F to steam at 220f - ANS-6,520 btu/h
How many watts of electrical strength are same to one horsepower - ANS-746
If a excessive temp evap is forming ice, which of the following is a possible hassle - ANS-Evap
fan no longer running
A manage may be which of the following:
Electrical
Mechanical
Electrical and Mechanical
All of the above - ANS-All of the above
A contemporary magnetic relay opens and closes its contacts primarily based at the -
ANS-Current in the run winding
A direct growth type evaporator is also called a - ANS-dry-kind evaporator
A helicopter is lifting an 800 lb unit at a price of 200 ft/in keeping with min. How many
horsepower of work power is the helicopter using within the process - ANS-four.848 hp
A liquid fabric exerts a pressure or force - ANS-outward and downward
A micron gauge is used to degree - ANS-Absolute stress beneath 1 mm Hg
A motor's velocity is decided by using - ANS-Number of motor poles
A normally operating water cooled condenser is operating with a ten degree differential among
water in and water out. If the amount of 85 diploma water going thru the condenser is
decreased, which of the following is a likely temp of the water leaving the condenser?
Seventy five F
zero F
ninety five F
one hundred and five F - ANS-a hundred and five diploma F
A stable material exerts a strain or force - ANS-downward only
A split-phase has a _____ winding and a ______ winding - ANS-Start and Run winding
A split-phase motor can use a ____ to energize and de-energize the begin winding:
Potential Relay
Current Relay
Centrifugal Switch
All of the above - ANS-All of the above
A ton of refrigeration is identical to - ANS-288,000 btu/24-hr
, A regular evaporator working temperature inside the AC gadget is - ANS-40 diploma F
A traditional superheat fro an evaporator operating beneath regular conditions could be ______
- ANS-8-12 diploma F
A vapor material exerts a strain or pressure _______ - ANS-In all instructions
An instance of a power consuming tool could be a ____ whilst an instance of a non-energy
eating device would be a _____ - ANS-Light bulb, single pole single throw switch
At a steady pressure the extent of a gas varies as to absolutely the temperature and at a steady
quantity the stress of the gas varies without delay with the absolute temperature. This is called
_______ law - ANS-Charles Law
At what location or places in a refrigeration gadget does the saturation stress correspond to the
saturation temperature - ANS-Evaporator and Condenser
By layout, which of the subsequent air ducts will allow 250 cfm to glide with a velocity of 500
ft/min?
9"x8"
sixteen"x9"
10"x9"
None of those - ANS-9"x8"
Centrifugal chillers variety in length from __________ tons - ANS-a hundred to ten,000 lots
Comfort can be described as the mild balance among - ANS-Air cleanliness, air movement,
temperature, and humidity
High temperature refrigeration is that produced by way of - ANS-an air-conditioning system
How many BTU's are required to change 1 lb of ice at 20 ranges to steam at 220 ranges -
ANS-1304 btu/h
How many BTU's are required to trade 5 lbs of ice at 20F to steam at 220f - ANS-6,520 btu/h
How many watts of electrical strength are same to one horsepower - ANS-746
If a excessive temp evap is forming ice, which of the following is a possible hassle - ANS-Evap
fan no longer running
