Topics: All categories in the pool
1: Ammonia vaporization takes place at what temperature?
- -110F
- -28F
- -460F
- -32F
2: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X power factor
- Watts = volts X amps
- Watts X amps.
3: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
4: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 15
- 75
- 55
- 50
5: Three-phase motors have what type of windings?
- three run windings
- three run windings and 3 start windings
- one start winding and one run winding.
- three start windings
6: Pressure is equivalent of
- Force / Area
- Area X Force
- Force X Area
- Force
7: Ammonia is under what safety classification?
- B3
- A3
- B2
- B1
8: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
9: Ohm's Law indicates Amps X Resistance = ___________.
- Ohms
- Volts
- Current
- Impedance
10: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
11: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
12: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
13: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a fusible plug
- a pressure relief device
14: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “U” or “UM”
- “UL”
- “UM” and “UV”
- “UV”
15: What refrigerant doesn't have to be classifted?
- R-717
- R-711
- R-134a
- R-718
16: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- CO Sensing
- phosgene gas sening
- A group sensing
17: Pipe identification labels are required when the system contains more than
- 110 lbs
- 120 lbs
- 65 lbs
- 55 lbs
18: Where would the EPR valve be located on a multiple evaporator system?
- inlet of the low temperature evaporator.
- outlet of the liquid line
- outlet of high temperature evaporator
- outlet of low temperature evaporator
19: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Saturated temperature
- Wet bulb temperature
- Dry bulb temperature
- Critical temperature
20: 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
21: What pipe can not be used for refrigeration?
- L
- M
- N
- K
22: 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)
- commercial occupancy
- illegal occupancy
- public assembly occupancy
- institutional occupancy
23: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Specific heat
- Sensible heat
- Latent heat
- Enthalpy
24: Which of the following is an example of an azeotropic refrigerant?
- R-134A
- R-404A
- R-410A
- R-500
25: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- There isn't enough information to answer.
- 2.5
- 1250
- 2