Topics: All categories in the pool
1: A start capacitor in series with a start winding will
- increase running efficiency
- decrease the amp draw of the motor
- increase the amp draw of the motor
- increase starting torque
2: NH3 is
- ammonia
- R-718
- R-508A
- lithium bromide
3: An oil pressure safety switch should be set at
- 10 to 15 psi below low side pressure
- 5 to 10 psi below low side pressure
- 10-15 psi above low side pressure
- 5 to 10 psi above low side pressure
4: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
5: A mercury bulb controller is not recommended for
- low voltage use
- line voltage use
- line or low voltage use
- use where vibration is severe
6: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- phosgene gas sening
- CO Sensing
- A group sensing
7: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- diluted solution
- strong solution
- weak solution
8: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
9: How much refrigerant can be stored in a mechanical room outside of the system?
- 330
- 150
- 200
- 100
10: one BTU equals
- 3.41 hp
- 12,000 hp
- 31.4 hp
- Pi
11: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
12: What instrument is used to measure very high resistance?
- tape measure
- voltmeter
- ammeter
- meg ohmmeter
13: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
- Approved by the installing contractor
- Approved by the authorized person
14: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
15: A class B1 refrigerant is considered
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
16: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 90%
- 80%
- 100%
17: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- make sure it's compatible, notify owner, notify A.H.J
- nothing must be done
- you can't change refrigerants
- place sign, check for leaks, insulate
18: 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
19: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Copper
- Magnesium alloy
- Stainless steel
20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 330 lbs.
- 55 lbs
- 550 lbs
21: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 43.3 psig
- 66.1 psig
- 50.2 psig
- 70.8 psig
22: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
23: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- installed through a pipe casing
- moisture barrier
- leak checked
24: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- boost voltage
- pick up voltage
- lift voltage
25: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct