Topics: All categories in the pool
1: Low ambient controls are used when
- when systems run all year round
- economizers are used
- always
- on air conditioning systems only
2: What type of relief valve is used on a CO2 system?
- glove disc
- gate valve
- fusible plug
- rupture disc
3: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-134A
- R-12
- R-22
4: One atmosphere equals
- 29.4
- 0 psig
- 0 psia
- 14.7
5: How are a compressor and condenser fan wired?
- series-parallel
- parallel-series
- parallel
- series
6: What would be the classification of a church?
- Large mercantile
- Place of assembly
- Industrial
- Institutional
7: A direct system
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
8: The two basic types of evaporators are
- finned and plate
- direct expansion and plate
- flooded and direct expansion
- prime surface and finned
9: Large mercantile occupancy is
- 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.
- 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 or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
10: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
11: On a TXV, the purpose of an external equalizer is to?
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
12: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Glove valve
- Fusible plug
- Rupture disk
13: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
14: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
15: How many square inches per square foot?
- 144
- 64
- 98
- 24
16: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100
17: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
18: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three start windings
- three run windings
- three run windings and 3 start windings
19: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 22
- 18
- 50
20: Gauge pressure is
- Barometric pressure
- Force of pressure above that of atmosphere
- Absolute pressrue
- Atmospheric pressure
21: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 20
- 15
- 50
22: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 400
- 100
- 250
- 350
23: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
24: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
25: What is the minimum height refrigeration piping should be placed against walls?
- Ceiling height
- 6'
- 7.25'
- 72"