Topics: All categories in the pool
1: Who approves containers for refrigerants?
- D.O.T
- E.P.A
- D.O.D
- D.O.E
2: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
3: "E" references ____ in the Ohm's law formula
- resistance
- capacitance
- amperage
- voltage
4: An electronic bridge circuit is basically a
- Wheatstone
- suspension
- 24 volt control circuit
- high voltage circuit
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: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
7: Class 3 refrigerants are
- highly flammable
- non-toxic
- non-flammable
- toxic
8: A declaration test is needed when the system contains more than
- 120 lbs
- 110 lbs
- 55 lbs
- 65 lbs
9: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 24,000 BTU
- 12,000 BTU
- 970 BTU
- 144 BTU
10: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- Dirty Coil
- Dirty fan blades
- High ambient temperature
11: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
12: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's a non-flammable refrigerant
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
13: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 600
- 500
- 400
14: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 25'
- 15'
15: An oil pressure safety switch should be set at
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10 to 15 psi below low side pressure
- 10-15 psi above low side pressure
16: A class B1 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
17: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
18: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- The rate of conduction
- 1 Therm
- 1 BTU
19: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- on top of the condensor
- between the compressor and reciever
- between the compressor and the stop valve
20: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
21: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UV or UR
- UL and UR
- UM or UL
22: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
23: The density of a gas refers to
- pounds per cubic foot
- pounds per absolute pressure
- pounds per square foot
- cubic feet per pound
24: Halo-carbon refrigerants cannot be used with what material?
- Magnesium alloy
- Copper
- Stainless Steel
- Aluminum
25: The generator shell contains the
- evaporator and the absorber
- condenser and the absorber
- condenser, the evaporator, and the generator
- condenser and the generator