Topics: All categories in the pool
1: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 110
- 100
- 80
- 90
2: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- determine the capacity of the service panel
- read the voltage with a mulitmeter
- check with the utility company
3: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
4: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 70F
- 58F
- 77F
- 32F
5: A motor starter contains a thermal overload and a
- contactor
- solenoid
- transformer
- 3-way relay
6: 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
7: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 110
- 6.6
- 1,000
8: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- outlet of the liquid line
- inlet of the low temperature evaporator.
9: Ammonia belongs to Group
- B-2
- B-1
- A-2
- A-1
10: Thermodynamics is the branch of science that deals with
- energy due to motion
- state of energy
- heat energy
- molecular therory
11: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- installed through a pipe casing
- leak checked
- moisture barrier
12: How many closing forces operate a thermostatic expansion valve?
- 3
- 4
- 2
- 1
13: 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)
- institutional occupancy
- illegal occupancy
- commercial occupancy
- public assembly occupancy
14: A moisture indicator must
- be filled with liquid
- be yellow
- be sight side up
- change color when exposed to moisture
15: What is used to check very low pressure?
- Manometer
- Hygrometer
- Velometer
- Hydrometer
16: A Lithium-bromide system is an absorption system that
- uses water as a absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
17: RPM's of a centrifugal compressor are at approximately?
- 15,000
- 10,000
- 500
- 30,000
18: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- 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
19: Total heat of a substance is considered
- specific heat
- sensible heat
- empathetical
- enthalpy
20: Which refrigerant class listed below is the most flammable?
- C-3
- B-2
- A-3
- A-1
21: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Barometer
- Manometer
- Anemomter
22: The absorber shell contains the
- condenser, the evaporator, and the generator
- condenser and the generator
- condenser and the absorber
- evaporator and the absorber
23: A start capacitor is wired in _____ with the start windings.
- series
- series-parallel
- parallel
- junction
24: 1 HP = ____ Watts?
- 3.1416
- 11,239
- 3,412
- 746
25: Clearance volume
- has no effect on compressor capacity
- is the same on all compressors
- varies depending on compressor speed
- affects compressor capacity