Topics: All categories in the pool
1: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
2: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- commercial occupancy
- public assembly occupancy
- institutional occupancy
- illegal occupancy
3: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
4: Suction valve unloaders afford an effective means of
- capacity control
- evaporator control
- refrigerant control
- superheat control
5: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
6: one BTU equals
- 3.41 hp
- 12,000 hp
- Pi
- 31.4 hp
7: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
8: On a pumpdown system, the liquid-line solenoid is controlled by the
- low pressure switch
- thermostat
- defrost timer
- low-ambient controller
9: A movie theater would be considered a
- public assembly occupancy
- mixed occupancy
- institutional occupancy
- commercial occupancy
10: Which oil is hydoscopic?
- mineral
- animal
- SW30
- polyolester
11: Ammonia systems use ____ pressure to adjust oil pressure
- liquid
- air
- discharge
- stream
12: Gauge pressure is
- force of pressure above that of atmospheric
- atmospheric pressure
- absolute pressure
- what a gauge reads when checking pressures on a chilled water system.
13: Control systems can be classified by
- tonnage of system
- safety
- economy of operation
- source of power
14: When energized, a normally open relay will be
- noisy
- depends on the type and class of the relay
- closed
- open
15: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
16: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 66.1 psig
- 70.8 psig
- 43.3 psig
17: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
18: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- hold up to 110% of the pumpdown charge
- release the charge when the pressure exceeds 310 psig or higher
- Pumpdown procedures are not allowed with systems containing liquid recievers
- receive the pumpdown charge
19: How many groups of refrigerants are there?
- 1
- 5
- 3
- 7
20: The best way to detect ammonia in brine is
- CO2 gas
- potassium of line
- carbonation of soda
- nessler regaent
21: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- there is no Group B1 refrigerants
- the same
- higher
22: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
23: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
24: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- too small evaporator
- compressor suction valve stuck open
- starved evaporator
- overcharged
25: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices