Topics: All categories in the pool
1: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
2: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 110
- 1,000
- 6.6
3: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- 15
- 10
- III
4: 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
5: A hissing noise at the expansion valve is a good indication that
- expansion valve is oversized
- liquid is passing thru it
- gas is passing thru it
- nothing is passing thru
6: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- OSHA
- Department of Energy
- NEC and Massachusetts Modifications
7: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Certified
- Classifed
- Insulated and installed in a pipe duct (Encased)
8: 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
9: What measures gas pressure?
- Manometer
- Barometer
- Hygrometer
- Hydrometer
10: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
- reduce friction loss to the flow of refrigerant
11: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
12: Copper and its alloys shall not be used with ammonia
- True
- False
13: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
14: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 500 lbs
- 660 lbs
- 330 lbs
15: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- quarterly
- regularly
- annually
- bi-annually
16: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
17: The Department that certifies the transportation of refrigerant is the
- DOT
- EPO
- RSES
- EPA
18: 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
19: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
20: What is used to check very low air pressures in air conditioning duct?
- Anemomter
- Manometer
- Barometer
- Vacuum gauge
21: Ammonia can come in contact with _______ ?
- Copper tubing
- Brass
- Copper
- Aluminum
22: Liquid level gauges must be provided with what?
- A relief valve
- A low level mark
- Automatic shut-offs
- A red line
23: How many opening forces operate a thermostatic expansion valve?
- 2
- 4
- 1
- 3
24: The External equalizer of a TXV compensates for
- pressure within the system
- pressure drop across the condenser coil
- pressure drop across the evaporator coil
- pressure within the evaporator
25: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UL and UR
- UM or UL
- UL and UM