Topics: All categories in the pool
1: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
2: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
3: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
4: Which creates more of a heat load?
- 70% RH
- 50% RH
- 90% RH
- 30% RH
5: How are refrigerant blends classified?
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
- Based on best case Fractionation
6: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Dry bulb temperature
- Wet bulb temperature
- Critical temperature
- Saturated temperature
7: What pipe can not be used for refrigeration?
- N
- K
- M
- L
8: A direct system
- is a self-contained complete factory made and tested system
- is one which encloses a separate body of evaporative refrigerant
- is on where brine is cooled & circulated to the space refrigerated
- is where the refrigerant comes in contact with the space refrigerated
9: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 36
- 18
- 24
10: In an electrical circuit, what is potential measured in?
- Ohms
- Amps
- Herys
- Volts
11: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
12: An example of an "Expendable Refrigerant" is
- liquid nitrogen
- ammonia
- lithium bromide
- liquid oxygen
13: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- commercial occupancy
- business occupancy
- public assembly occupancy.
14: A run capacitor is wired in series with the _____ windings.
- run
- start
- common
- start capacitor
15: Low-side system leaks in a low-pressure chiller will often result in
- air being pulled into the system
- nitrogen leaking out of the system.
- system refrigerant leaking from the system
- water being pulled into the system
16: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
17: Which of the following is not an air velocity meter?
- Anemometer
- Hydrometer
- Anemotherm
- Velometer
18: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Fusible plug
- Glove valve
- Rupture disk
19: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
- Because it's a non-flammable refrigerant
- Because it's cheap
20: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- on the third floor roof and the evaporator is in the basement
- located outside the operates in temperatures below 35F
- in the basement and the evaporator is on the third floor
21: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and unbalanced head and friction head
22: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- centrifugal switch
- printed circuit board (PCB)
- motor starter
- duel-voltage switch
23: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- phosgene gas sening
- CO Sensing
- refrigerant sensing
- A group sensing
24: What is the refrigerant dichlorodifluoromethane?
- R-12
- R-134A
- R-123
- R-22
25: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above