Topics: All categories in the pool
1: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- CFC-11
- HCFC-123
- Lithium bromide
2: The proper location for an oil separator is between the
- compressor and condenser
- evaporator and compressor
- condenser and receiver
- receiver and metering device
3: Volts x amps equals
- Impedance
- Ohms Law
- Watts
- Inductance
4: What is potential measured in?
- Amps
- Volts
- Henrys
- Ohms
5: Setting a pressure relief device shall not exceed ___ of the design pressure
- 100%
- 80%
- 75%
- 90%
6: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
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: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- lower chamber of the low side
- lower chamber of the high side
- upper chamber of the high side
9: Electricity involves the movement of electrons in atoms
- True
- False
10: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
11: Usually dry bulb temperature is
- higher than wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
- same as wet bulb temperature
12: A class A3 refrigerant is considered
- non-toxic but highly flammable
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
13: A start capacitor is wired in _____ with the start windings.
- series-parallel
- junction
- series
- parallel
14: Which winding have the most turns?
- Start
- run
- they have equal amount of turns
- depends on the motor phase
15: Secondary refrigerants are usually
- alcohol
- water or brine
- expensive
- Prestone anti-freeze
16: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
17: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
- no flames shall be permitted
18: A Lithium-bromide system is an absorption system that
- uses water as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
19: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 21F
- 9F
- 29F
- 11F
20: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and temperature range
- Flammability and toxicity
- Weight and color
21: On a large centrifugal system, what meters the flow to the evaporator?
- High side float
- Cap tube.
- TXV
- Low side float
22: The best way to detect ammonia in brine is
- carbonation of soda
- CO2 gas
- potassium of line
- nessler regaent
23: The color code of a tank of ammonia is
- white
- light green
- silver
- lavender
24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- 9,776 watts
- 977.6 watts
- .9776 watts
25: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 20
- 50
- 15
- 75