Topics: All categories in the pool
1: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 20
- 15
- 50
2: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X amps.
- Watts = volts X amps
- Watts X power factor
3: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 99%
- 75%
- 90%
4: Color is important in oil because
- can tell us something about the refining of oil
- it makes sight glasses easy to read
- it indicates the viscoisty.
- allows you to see into crankcase
5: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
6: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 550 lbs
- 330 lbs.
- 55 lbs
7: Which occupancy can ammonia be used in?
- depends on the quantity of freon
- industrial
- commercial
- redifential
8: "I" represents ____ in the Ohm's law formula.
- amperage
- voltage.
- resistance
- capacitance
9: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- tower fans
- evaporation of the water droplets
- sensible heat
10: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 44 lbs
- 13.9 lbs
- 22 lbs
- 6.6 lbs
11: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 5/16"
- 3/32"
- 1/8"
12: Lithium-bromide, Li-Br, is best characterized as a
- sand
- soil
- sugar
- salt
13: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Over feed
- Close
- Stay open
14: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
15: Viscosity is
- measure of weight
- the ability of oil to flow
- a measure of heat content
- the coefficient of external friction
16: The solution that leaves the concentrator in an absorption chiller is referred to as the
- weak solution
- diluted solution
- absorbed solution
- strong solution
17: A single pole-double throw switch used how many wires excluding the ground wire?
- five
- four
- three
- two
18: On a single phase motor, when does the start winding cut out?
- At 50% of its full rated speed
- At 75% of its full rated speed
- At 25% of its full rated speed
- Start windings do no cut-out of the run cycle
19: Which of the following is NOT a positive displacement compressor?
- screw
- centrifugal
- reciprocating
- scroll
20: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- mixed occupancy
- institutional occupancy
- commercial occupancy
21: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
22: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
23: A start capacitor is wired in _____ with the start windings.
- series-parallel
- parallel
- series
- junction
24: The low pressure oil safety switch
- resets itself after the time delay has terminated
- must be reset manually
- never trips
- resets itself automatically
25: The two basic types of evaporators are
- flooded and direct expansion
- prime surface and finned
- finned and plate
- direct expansion and plate