Topics: All categories in the pool
1: A VRF system is a direct system
- true
- false
2: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
3: An air conditioning system rated for 36,000 BTU's is equivalent to
- three tons of cooling
- two tons of cooling
- 12,000 tons of cooling
- one ton of cooling
4: A movie theater would be considered a
- institutional occupancy
- public assembly occupancy
- mixed occupancy
- commercial occupancy
5: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Positive displacement
- Low Pressure displacement
- Non-positive displacement
- Pressure induced displacement.
6: All electrical work done on refrigeration systems must comply with
- Department of Energy
- ASHREA-15 Section 9.2.1
- OSHA
- NEC and Massachusetts Modifications
7: "I" represents ____ in the Ohm's law formula.
- capacitance
- resistance
- amperage
- voltage.
8: What type of copper is not permitted on refrigeration systems?
- Type N
- Type M
- Type L
- Type K
9: Secondary refrigerants are usually
- Prestone anti-freeze
- alcohol
- water or brine
- expensive
10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 66
- 25
11: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is a self-contained complete factory made and tested system
- is where the refrigerant comes in contact with the space refrigerated
- is on where brine is cooled & circulated to the space refrigerated
12: On a single phase motor, when does the start winding cut out?
- At 75% of its full rated speed
- Start windings do no cut-out of the run cycle
- At 50% of its full rated speed
- At 25% of its full rated speed
13: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
14: The actual expansion curve of compressor follows most nearly which one of the following
- Volume
- Pressure-Temperature
- Isothermal
- Adiabatic
15: Which occupancy can ammonia be used in?
- industrial
- depends on the quantity of freon
- commercial
- redifential
16: How are safety controls wired in a circuit?
- Parallel
- Series
- Either series or parallel
- Series/parallel
17: Which creates more of a heat load?
- 90% RH
- 70% RH
- 30% RH
- 50% RH
18: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- the same
- lower
- higher
19: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 0 psig
- 5 psig
- 10 psig
20: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices
21: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- latent heat
- specific heat
- lost heat
- sensible heat
22: "P" represents ______ in the Watt's law formula
- reactance
- voltage
- watts
- amperage
23: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 9F
- 21F
- 29F
- 11F
24: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 350
- 250
- 400
25: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the high side
- the aggregate of the high side and low side
- 2.5 times the design pressure