Topics: All categories in the pool
1: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-11
- R-113
2: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
3: A hotel is considered a _______ occupancy.
- commercial
- mercantile
- institutional
- residential
4: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
5: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-22
- R-134A
- R-11
6: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- the same
- lower
- there is no Group B1 refrigerants
7: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- business occupancy
- public assembly occupancy.
- commercial occupancy
8: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
9: Which refrigerant replaced R-12?
- R-410A
- R-407A
- R-22
- R-134A
10: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
- between the compressor and the stop valve
11: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- every 18 months
- annually
12: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
13: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
14: Ohm's Law indicates Amps X Resistance = ___________.
- Impedance
- Current
- Ohms
- Volts
15: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and unbalanced head and friction head
- GPM and friction head
16: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- capacity control
- refrigerant control
17: High pressure controls should be set no higher than
- 80% of set point
- 90% of set point
- 25% of set point
- 10% of set point
18: Name three things that must be done when changing refrigeration lubricant?
- Place sign, check for leaks, insulate
- You can't change lubricants.
- Make sure it's compatible, notify owner, notify AHJ
- Nothing must be done
19: Low ambient controls are used when
- when systems run all year round
- always
- economizers are used
- on air conditioning systems only
20: On a single phase motor, when does the start winding cut out?
- At 25% of its full rated speed
- At 50% of its full rated speed
- Start windings do no cut-out of the run cycle
- At 75% of its full rated speed
21: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
22: A micron is
- one thousandths of a millimeter
- one millonths of a centimeter
- a larger unit of measurement than Hg
- one millonths of a micrometer
23: The best way to detect ammonia in brine is
- carbonation of soda
- potassium of line
- CO2 gas
- nessler regaent
24: Pipe identification labels are required when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
25: The location of a thermal bulb of a TXV affects
- the amount of liquid refrigerant in the evaporator
- the amount of liquid returning to the compressor
- subcooling
- the amount of liquid in the condenser.