Topics: All categories in the pool
1: Pressure is equivalent of
- Force X Area
- Force
- Force / Area
- Area X Force
2: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
3: The absorber shell contains the
- condenser, the evaporator, and the generator
- condenser and the generator
- condenser and the absorber
- evaporator and the absorber
4: A EPR valve is installed on what type of evaporators?
- shell and tube evaporators
- plate evaporators
- low-temperature evaporators
- high-temperature evaporators
5: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 24
- 100
- 50
- 75
6: What is the boiling point of refrigerant governed by?
- P&T relationship
- Compressor RPM's
- Condenser sub-cooling
- Evaporator temperature
7: The oil separator is always inserted in the system
- where it can be easily serviced
- to prevent oil logging
- in a cool spot
- in the discharge line
8: Doors communicating with outside from a mechanical room must be?
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, wooden, fire door
9: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Stainless steel
- Copper
- Magnesium alloy
10: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted and protected from dirt, water, and other elements
- shall be posted on the compressor shell or electrical panel at the unit
- shall be authorized by a notarized insurance company
11: Adjusting the spring pressure on a TXV
- changes subcooling
- changes superheat
- adjusts the bulb charge
- makes no difference
12: What is R-611’s ASHRAE Safety Code?
- C3
- B3
- B2
- A2
13: While the system is operating, the discharge line should be
- too hot to hold by hand
- 10-15F warmer than ambient
- at the same temperature as the crankcase
- room temperature
14: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- splurge
- surge
- merge
- purge
15: How many opening forces operate a thermostatic expansion valve?
- 2
- 1
- 4
- 3
16: What is the state of the refrigerant leaving the evaporator?
- low temperature superheated vapor
- a low temperature subcooled liquid
- a high temperature subcooled liquid
- a high temperature superheated vapor
17: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
18: On a TXV, the purpose of an external equalizer is to?
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
19: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-11
- R-22
- R-134A
20: In an ammonia refrigeration system, a low oil pressure switch trips. What happens?
- Emergency oil pump starts
- Condenser & evaporator CFMs increase
- The switch resets within 10 seconds
- Compressor shuts down
21: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 3.0
- 5.5
- 2.0
22: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
23: A pressure relief should be located at least _______ from windows and doors.
- 15'
- 30'
- 20'
- 25'
24: In a system designed for sub-zero ambient temperatures, what must be added?
- Booster compressor
- Low-ambient kit
- Nitrogen
- Infrared dye for leak identification
25: R-11 belongs to Group
- A-2
- B-1
- A-1
- B-3