Topics: All categories in the pool
1: 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
2: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat giving by the condenser
- the heat of compression
- the heat lost by the medium being cooled
3: How far from the ground does a relief valve need to be?
- At least 15' above grade
- At least 20' above grade
- At least 25' above grade
- Not more than 3' above grade
4: "E" references ____ in the Ohm's law formula
- voltage
- amperage
- resistance
- capacitance
5: What is NOT a positive displacement compressor.
- Rotary
- Reciprocating
- Scroll
- Centrifugal
6: Brazed joints melt at temperatures above
- 800F
- 500F
- 1,000F
- 1,200F
7: Adjusting the spring pressure on a TXV
- changes subcooling
- changes superheat
- makes no difference
- adjusts the bulb charge
8: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
9: 746 watts is equal to
- 1 hp
- Pi
- 100 hp
- 10 hp
10: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- upper chamber of the low side
11: 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
12: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
13: Usually dry bulb temperature is
- higher than wet bulb temperature
- same as wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
14: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 277v
- 208v
- 240v
- 120v
15: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- boost voltage
- lift voltage
- pick up voltage
- run voltage
16: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and the stop valve
- between the compressor and reciever
17: How many BTU's is produced by one watt of energy
- 3.00
- 2.57
- 1
- 3.41
18: What device measures the specific gravity of a substance?
- Hygrometer
- Hydrometer
- Manometer
- Thermometer
19: A high side float is a
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the crankcase oil level
- float type valve that controls the amount of refrigerant stored in the receiver
20: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-113
- R-12
- R-22
- R-11
22: B3 refrigerants are considered
- non-toxic but flammable
- toxic but non-flammable
- non-toxic but non-flammable
- toxic and highly flammable
23: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 22
- 18
- 50
24: The first step in mechanical refrigeration is
- condensation
- expansion
- compression
- evaporation
25: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
- you can never change refrigerants