Topics: All categories in the pool
1: The location of a thermal bulb of a TXV affects
- subcooling
- the amount of liquid returning to the compressor
- the amount of liquid refrigerant in the evaporator
- the amount of liquid in the condenser.
2: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- lower
- there is no Group B1 refrigerants
- the same
3: Humidity can be sensed with
- thermometer
- human hair
- pressure bellows
- bimetal
4: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- Stainless steel
- PVC
5: A hotel is considered a _______ occupancy.
- residential
- commercial
- institutional
- mercantile
6: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
7: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
8: Megaohm meters can detect a ground in the
- up to 10,000 ohms
- up to 1,000,000 ohms
- up to 1,000 ohms
- 10,000,000 ohms or higher
9: 746 watts is equal to
- 10 hp
- 1 hp
- Pi
- 100 hp
10: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
11: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- institutional occupancy
- public assembly occupancy
- commercial occupancy
- mixed occupancy
12: What is the voltage of each leg of a 480 Volt three-phase motor?
- 277v
- 120v
- 240v
- 208v
13: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
14: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
15: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EEV
- EPR valve
- CPR valve
- Solenoid valve
16: On a centrifugal compressor, stationary diffuser vanes are needed to
- increase the clearance space
- convert velocity energy to pressure
- prevent high pressure on the packing
- stop gas flow
17: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 90%
- 80%
- 100%
- 75%
18: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Increasae
- Decrease
- Nothing
19: 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
- illegal occupancy
- institutional occupancy
- public assembly occupancy
20: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- III
- 15
- 10
21: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
22: Volts x amps equals
- Ohms Law
- Impedance
- Watts
- Inductance
23: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
24: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 60
- 720,000
- 12,000
25: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above