Topics: All categories in the pool
1: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
2: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will foam
- oil will thicken
- oil level will rise
3: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
4: When an inspection is needed, how often must it be done?
- annually
- every 18 months
- every 24 months
- every 36 months
5: The reversing valve is commonly used
- on multiple compressor systems
- on commercial system that involve two different temperatures
- when the code requires a check valve
- on all heat pumps
6: The proper location for an oil separator is between the
- receiver and metering device
- evaporator and compressor
- condenser and receiver
- compressor and condenser
7: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 2.5
- There isn't enough information to answer.
- 1250
- 2
8: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 22
- 66
9: How many gallons of water do you need per pound of ammonia?
- 100
- 1
- 10
- 50
10: 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.
- 90
- 100
- 80
- 110
11: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
12: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- Any fluid that exceeds 150 psig and has design temperature of over 366F
13: Relief valves are rated in
- gallons of water per hour
- pounds of air per minute
- gallons of water per minute
- pounds of air per hour
14: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct
15: Fractionation occurs when
- the pressures increase as the heat load increases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- when a fraction of refrigerant is added as the full charge
- the pressures decreases as the heat load decreases
16: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
17: Viscosity is
- the coefficient of external friction
- a measure of heat content
- the ability of oil to flow
- measure of weight
18: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 15 uf
- 25 uf
- 20 uf
- 40 uf
19: The measurement of heat in a particular substance is
- sensible heat
- enthalpy
- latent heat
- specific heat
20: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIA
- PSIG
- temperature minus pounds of air per second divided by release rate squared
21: Adjusting the spring pressure on a TXV
- makes no difference
- changes subcooling
- adjusts the bulb charge
- changes superheat
22: Where would the EPR valve be located on a multiple evaporator system?
- outlet of the liquid line
- inlet of the low temperature evaporator.
- outlet of low temperature evaporator
- outlet of high temperature evaporator
23: If the power element on an expansion valve should lose its charge, the valve would
- Close
- Under feed
- Over feed
- Stay open
24: "E" represents _____ in the Watt's law formula.
- amperage
- voltage
- watts
- reactance
25: Booster compressors connect to the ____ side of the compressor
- liquid
- oil side
- vapor
- low side