Topics: All categories in the pool
1: At higher altitudes, boiling temperatures
- increase
- decrease
- depends on the refrigerant
- are unaffected
2: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Muffler
- Moisture indicator
- Stop valve
3: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 45F
- 58F
- 32F
- 55F
4: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- start the comrpessor
- start the fan and circulating pump
- reset the expansion valve
- reset the safety valve
5: When an electronic bridge is in balance the bridge output will be
- 1 volt
- 15 volts
- 0 volts
- .01 volts
6: Gauge pressure is
- Atmospheric pressure
- Absolute pressrue
- Barometric pressure
- Force of pressure above that of atmosphere
7: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UV or UR
- UM or UL
- UL and UR
8: Humidity can be sensed with
- bimetal
- pressure bellows
- thermometer
- human hair
9: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Non-positive displacement
- Low Pressure displacement
10: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or less
- 3 cubic feet or more
- 15 cubic feet or more
11: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
- At least 25' above grade
12: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
13: 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
- public assembly occupancy
- illegal occupancy
- institutional occupancy
14: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
15: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
16: What instrument is used to measure very high resistance?
- meg ohmmeter
- voltmeter
- ammeter
- tape measure
17: 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”
- “UM” and “UV”
- “UV”
- “UL”
18: Ammonia systems use ____ pressure to adjust oil pressure
- liquid
- stream
- discharge
- air
19: Which occupancy can ammonia be used in?
- commercial
- industrial
- depends on the quantity of freon
- redifential
20: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
21: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 29F
- 9F
- 21F
- 11F
22: What does an anemometer measure?
- velocity
- temperature
- voltage
- amperage
23: The measurement of heat in a particular substance is
- latent heat
- enthalpy
- sensible heat
- specific heat
24: What section of ASHRAE-15 governs pressure vessels?
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- OSHA
25: Viscosity is
- measure of weight
- the ability of oil to flow
- a measure of heat content
- the coefficient of external friction