Topics: All categories in the pool
1: The low pressure oil safety switch
- never trips
- resets itself automatically
- must be reset manually
- resets itself after the time delay has terminated
2: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
3: The proper location for an oil separator is between the
- condenser and receiver
- receiver and metering device
- compressor and condenser
- evaporator and compressor
4: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 40 uf
- 25 uf
- 20 uf
- 15 uf
5: At higher altitudes, boiling temperatures
- increase
- are unaffected
- depends on the refrigerant
- decrease
6: When using nitrogen for brazing, the pressure should be:
- 125 psig
- Slightly below atmospheric
- Very low
- 50-100 psig
7: Which oil is hydoscopic?
- animal
- SW30
- mineral
- polyolester
8: A Low-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
9: Foaming of oil in a compressor is most likely to occur
- when ambient temperature are low
- when the evaporator temperatures are below 32F
- at start-up
- when there is insufficient air across the condenser(i.e., dirty coil)
10: Adjusting the spring pressure on a TXV
- changes subcooling
- adjusts the bulb charge
- changes superheat
- makes no difference
11: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
12: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
13: In an A/C unit, dirty filters will cause
- low oil pressure
- high discharge pressure
- high suction pressur
- low suction pressure
14: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
15: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
16: Ammonia belongs to Group
- B-1
- A-1
- B-2
- A-2
17: If your suction line is warmer than the room temperature, this may indicate
- an over charge
- plugged air filter
- below normal superheat
- a low charge
18: The Department that certifies the transportation of refrigerant is the
- RSES
- DOT
- EPA
- EPO
19: When an inspection is needed, how often must it be done?
- every 24 months
- every 18 months
- every 36 months
- annually
20: Which refrigerant replaced R-12?
- R-22
- R-134A
- R-410A
- R-407A
21: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 55 lbs
- 120 lbs
22: A class B1 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic but non-flammable
- toxic and somewhat flammable
23: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- depends on the type of refrigerant being used
- are obsolete.
- True
- False
24: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- regularly
- quarterly
- bi-annually
25: Pipe identification labels are required when the system contains more than
- 110 lbs
- 55 lbs
- 120 lbs
- 65 lbs