Topics: All categories in the pool
1: Low pressure chiller systems use what type of compressor?
- Screw
- Scroll
- Centrifugal
- Reciprocating
2: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 10
- 15
- 25
3: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
4: An example of an "Expendable Refrigerant" is
- liquid oxygen
- liquid nitrogen
- ammonia
- lithium bromide
5: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
6: The actual expansion curve of compressor follows most nearly which one of the following
- Adiabatic
- Isothermal
- Pressure-Temperature
- Volume
7: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
8: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
9: All low-pressure chillers use which type of compressor?
- Rotary
- Scroll
- Centrifugal
- Reciprocating
10: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 58
- 96
- 88
- 38
11: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and copper contacts
12: At higher altitudes, the boiling point of refrigerant is
- the same
- equal to the coefficient of water at 32F
- higher
- lower
13: What type of oil is used in R-410A systems?
- mineral oil
- naphthene
- polyalkylene glycol (PAG)
- polyolester (POE)
14: 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
15: Low-side system leaks in a low-pressure chiller will often result in
- nitrogen leaking out of the system.
- system refrigerant leaking from the system
- water being pulled into the system
- air being pulled into the system
16: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 12,000 BTU
- 24,000 BTU
- 970 BTU
- 144 BTU
17: What is the leaving chilled water set point for water chiller systems?
- 66F
- 55F
- 45F
- 38F
18: A run capacitor is wired in series with the _____ windings.
- start capacitor
- common
- run
- start
19: How are a compressor and condenser fan wired?
- parallel
- parallel-series
- series
- series-parallel
20: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or less
- 3 cubic feet or more
- 15 cubic feet or more
21: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 2.5
- 3.0
- 5.5
22: What is not a requirement of a Class T machine room?
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
23: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- animal, vegetable, and castor
24: The measurement of heat in a particular substance is
- latent heat
- enthalpy
- sensible heat
- specific heat
25: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and unbalanced head and friction head
- GPM and friction head