Topics: All categories in the pool
1: What is an egress?
- An entrance or exit
- An escape route
- A code violation
- A valve put on the low side of the system to prevent frosting
2: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
3: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
- Yes, always
4: The best way to detect ammonia in brine is
- CO2 gas
- carbonation of soda
- potassium of line
- nessler regaent
5: What does an anemometer measure?
- velocity
- voltage
- amperage
- temperature
6: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, paper method, and frost line.
- sight glass, weight, pressure, and dipstick
- sight glass, weight, pressure, and frost line
7: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
8: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
9: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
10: Direct systems using Group II refrigerants
- shall be installed in Class T machinery rooms
- shall be installed per instruction of the AHJ
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
11: In an A/C unit, dirty filters will cause
- high discharge pressure
- low suction pressure
- high suction pressur
- low oil pressure
12: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Contractors only
- Anyone, it's a completely safe area
- Any employee
13: The solution that leaves the concentrator in an absorption chiller is referred to as the
- strong solution
- diluted solution
- weak solution
- absorbed solution
14: 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
15: Excessive head pressure is often caused by
- leaking reed valve on the discharge side
- thermostat set too high
- insufficient refrigerant
- air cooled condenser is plugged
16: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
17: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- System operating pressure will drop
- The Li-Br solution will become more diluted
- Rust can form
- The Li-Br solution will become more concentrated
18: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 125 psig
- 255 psig
- 365 psig
- 327 psig
19: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 18"
- 36"
- 24"
20: A relief valve shall be located at least ___ above grade.
- 10'
- 36'
- 15'
- 25'
21: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
22: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 1,000F
- 800F
23: What refrigerant doesn't have to be classified?
- R-422A
- R-134A
- R-717
- R-718
24: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- run as designed with low ambient controls
- doesn't change
- decreases
- increases
25: Cooling tower lowers condenser water temp by
- condensation
- running fans at 100%
- running water thru a secondary heat exchanger
- evaporative cooling