Topics: All categories in the pool
1: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- nearly the same
- a ling psychrometer doesn't have two theremometers.
- far apart or greater difference
2: All serviceable components of a refrigeration system shall be provided with
- manufactures instructions on start-up procedures
- safe access
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- service manuals
3: What would be the classification for Stop & Shop grocery store?
- Industrial
- Place of assembly
- Large mercantile
- Instituional
4: How many CFMs are required per square foot of commercial office occupied space
- 20 CFM
- 15 CFM
- .5 CFM
- 5 CFM
5: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or less
- 3 cubic feet or more
- 15 square feet or less
6: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
7: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
8: A class A3 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
9: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- increased capacity
- low suction pressure
- high head pressure
10: The leaving chilled water set point for comfort cooling is typically?
- 60
- 66
- 45
- 38
11: On a TXV, the purpose of an external equalizer is to?
- balance the evaporator load
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- compensate for a pressure drop across the evaporator coil
12: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
13: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
14: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Weight and color
- Flammability and toxicity
- Flammability and temperature range
15: NH3 is
- lithium bromide
- R-508A
- R-718
- ammonia
16: When must refrigeration system covered by the code be inspected?
- Annually
- Annually and when installed
- Upon installation
- Not required
17: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the high side
- upper chamber of the high side
- upper chamber of the low side
- lower chamber of the low side
18: What is the refrigerant chlorodifluoromethane?
- R-22
- R-134a
- R-123
- R-12
19: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- overcharge of oil
- plugged drier
- leaking discharge valves in the compressor
20: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- red
- orange
- blue
21: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it
- the total length of pipe as you would measure it plus 25% for fittigns
22: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 2.0
- 3.0
- 5.5
23: The main purpose of the accumulator is to
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
- prevent liquid slugs at the compressor
- provide space for vapor to accumulate
24: The Department that certifies the transportation of refrigerant is the
- RSES
- EPO
- DOT
- EPA
25: What type of relief valve is used on a CO2 system?
- fusible plug
- glove disc
- gate valve
- rupture disc