Topics: All categories in the pool
1: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would make the condenser more efficient
- it would make the condenser less efficient
- it would cause the condenser to sweat
- it would have no effect on the condenser
2: Pipe identification labels are required when the system contains more than
- 120 lbs
- 65 lbs
- 110 lbs
- 55 lbs
3: "P" represents ______ in the Watt's law formula
- watts
- amperage
- reactance
- voltage
4: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- trichlorotrifluoromethane
- methyl chloride
- ammonia
- R-718
5: A capacitor in series with the start windings will do what?
- Nothing
- Increase starting torque
- Increase run efficiency by 10% of its rating
- Decrease the RLA to within 10% of its rating
6: 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
7: Who is permitted to access a refrigeration machine room?
- Contractors only
- Anyone, it's a completely safe area
- Authorized persons only
- Any employee
8: A restaurant is classified as a
- large mercantile occupancy
- commercial occupancy
- mixed occupancy
- public assembly occupancy
9: 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
10: A class B2 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic and non-flammable
- non-toxic and highly flammable
11: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
12: Megaohm meters can detect a ground in the
- 10,000,000 ohms or higher
- up to 10,000 ohms
- up to 1,000,000 ohms
- up to 1,000 ohms
13: How many groups of refrigerants are there?
- 3
- 1
- 7
- 5
14: What is a high-side float?
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
15: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
16: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the discharge line
- traps are needed on the suction line
- traps are needed on the oil return line
17: Pressure is the equivalent of
- force per unit area
- force
- force times area
- area times force
18: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
19: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- Yes, always
- No, never
20: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- The rate of conduction
- 1 BTU
- 1 Kelvin
- 1 Therm
21: Low ambient controls are used when
- always
- on air conditioning systems only
- when systems run all year round
- economizers are used
22: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 34.15
- 16.64
- 3.415
- 6.830
23: Who approves containers for refrigerants?
- E.P.A
- D.O.D
- D.O.E
- D.O.T
24: Bubbles in the liquid line sight glass could be caused by
- overcharge of oil
- bad low pressure switch
- plugged drier
- leaking discharge valves in the compressor
25: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Oil and water
- Air and dirt
- Water and soap
- Moisture and air