Topics: All categories in the pool
1: Give an example of a secondary coolant?
- R-717
- R-12
- R-718
- R-410A
2: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
3: Viscosity is
- the ability of oil to flow
- measure of weight
- a measure of heat content
- the coefficient of external friction
4: When should a relief valve start to function?
- At it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- 10 psi before it's set pressure
5: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 10
- 15
- 25
- III
6: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 66
- 22
7: Color is important in oil because
- can tell us something about the refining of oil
- it makes sight glasses easy to read
- allows you to see into crankcase
- it indicates the viscoisty.
8: Heat transferred by conduction from one body to another is done
- via solids
- via radiation
- via heat rays
- via liquids
9: The instrument used to measure the specific gravity of absorption chiller solutions is the
- hydrometer
- anemometer
- Psychrometer
- refractometer
10: Start to Run windings will have what resistance?
- All will be at equal values
- The least resistance value
- The most resistance value
- Somewhere between the actual start winding and run winding resistance value
11: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
12: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe as you would measure it
13: What pipe can not be used for refrigeration?
- L
- M
- K
- N
14: B3 refrigerants are considered
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic and highly flammable
15: A start capacitor in series with a start winding will
- increase running efficiency
- increase the amp draw of the motor
- decrease the amp draw of the motor
- increase starting torque
16: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
17: While the system is operating, the discharge line should be
- 10-15F warmer than ambient
- room temperature
- too hot to hold by hand
- at the same temperature as the crankcase
18: A moisture indicator must
- be filled with liquid
- be sight side up
- be yellow
- change color when exposed to moisture
19: In an electrical circuit, what is potential measured in?
- Ohms
- Herys
- Volts
- Amps
20: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 32F
- 58F
- 45F
- 55F
21: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 30F to 50F
- -40F to 0F
- 0F-38F
- -100F to -40F
22: The measurement of heat in a particular substance is
- enthalpy
- specific heat
- sensible heat
- latent heat
23: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the aggregate of the high side and low side
- the high side
- 2.5 times the design pressure
24: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat of compression
- the heat giving by the condenser
- the heat lost by the medium being cooled
25: How many square inches per square foot?
- 24
- 144
- 98
- 64