Topics: All categories in the pool
1: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
2: 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
- public assembly occupancy.
- business occupancy
- commercial occupancy
3: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- RPM and CFM increase
- CFM and HP increase
- CFM and HP decrease
- CFM and RPM decrease
4: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
5: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 40'
- At least 30'
- At least 20'
6: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- upper chamber of the low side
7: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 120v
- 240v
- 208v
- 277v
8: How many flammability classifications are refrigerants in?
- 7
- 2
- 3
- 5
9: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the discharge line
- traps are needed on the suction line
- traps are needed on the oil return line
10: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
11: A Low-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
12: Clearance volume
- affects compressor capacity
- varies depending on compressor speed
- is the same on all compressors
- has no effect on compressor capacity
13: 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
14: NH3 is
- lithium bromide
- R-508A
- ammonia
- R-718
15: 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
16: How many gallons of water do you need per pound of ammonia?
- 1
- 50
- 10
- 100
17: R-12 is
- dichloromethane
- dichlorodifluoromethane
- trichlorofluoromethane
- dichlorofluoromethane
18: one BTU equals
- Pi
- 31.4 hp
- 3.41 hp
- 12,000 hp
19: When using nitrogen for brazing, the pressure should be:
- Very low
- 125 psig
- 50-100 psig
- Slightly below atmospheric
20: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
21: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Welded and seamed.
- Ducted and sealed
- Flanged and gasketed
22: A micron is
- one millonths of a centimeter
- one millonths of a micrometer
- one thousandths of a millimeter
- a larger unit of measurement than Hg
23: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- store liquid refrigerant
- provide space for the accumulation of oil and containminants
- prevent liquid slugs at the compressor
24: Increasing superheat will do what to your system?
- Decrease liquid flow
- Increase liquid flow
- Nothing
- Increase gas flow
25: 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)?
- motor starter
- printed circuit board (PCB)
- duel-voltage switch
- centrifugal switch