Topics: All categories in the pool
1: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
2: How far from the ground does a relief valve need to be?
- At least 20' above grade
- Not more than 3' above grade
- At least 15' above grade
- At least 25' above grade
3: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
4: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
5: Relief valves are rated in
- gallons of water per hour
- pounds of air per hour
- gallons of water per minute
- pounds of air per minute
6: The color code of a tank of ammonia is
- lavender
- light green
- white
- silver
7: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 55
- 50
- 15
- 75
8: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
9: RPM's of a centrifugal compressor are at approximately?
- 500
- 30,000
- 15,000
- 10,000
10: The measurement of heat in a particular substance is
- specific heat
- sensible heat
- enthalpy
- latent heat
11: Heat transferred by conduction from one body to another is done
- via heat rays
- via radiation
- via liquids
- via solids
12: The leaving chilled water set point for comfort cooling is typically?
- 66
- 45
- 60
- 38
13: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
14: How many forces operate a thermostatic expansion valve?
- 3
- 2
- 1
- 4
15: All electrical work done on refrigeration systems must comply with
- OSHA
- ASHREA-15 Section 9.2.1
- NEC and Massachusetts Modifications
- Department of Energy
16: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 330 lbs
- 55 lbs
- 500 lbs
17: In an A/C unit, dirty filters will cause
- high discharge pressure
- low oil pressure
- low suction pressure
- high suction pressur
18: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 155F
- 158F
- 45F
- 32F
19: "I" represents _______ in the Watt's law formula.
- reactance
- watts
- amperage
- voltage
20: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Manometer
- Anemomter
- Barometer
21: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
22: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
23: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Over feed
- Close
- Stay open
24: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
25: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- upper chamber of the low side
- lower chamber of the low side
- lower chamber of the high side