Topics: All categories in the pool
1: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
2: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- public assembly occupancy
- institutional occupancy
- commercial occupancy
- illegal occupancy
3: Refrigerant restricted in 2004 but used for transition for decades:
- R-11
- R-123
- R-134A
- R-22
4: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Low Pressure displacement
- Pressure induced displacement.
- Non-positive displacement
- Positive displacement
5: E = I X R is
- Ohms Law
- Impedance Law
- Amps Law
- Watts Law
6: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
7: A start capacitor is wired in _____ with the start windings.
- series-parallel
- junction
- parallel
- series
8: A restaurant is classified as a
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
9: Crankcase heaters are energized
- to prevent compressor freeze-up
- while the compressor is running
- when the compressor is off
- to allow easy compressor start-up
10: What instrument is used to measure very high resistance?
- voltmeter
- tape measure
- ammeter
- meg ohmmeter
11: A run capacitor is wired in series with the _____ windings.
- start capacitor
- run
- start
- common
12: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it plus 25% for fittigns
13: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Nothing must be done
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
14: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- Copper
- Aluminum
- PVC
15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
16: A Low-Probability System
- is a system highly likely to leak form a failed connection or component of such 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 can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
17: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-2
- B-1
- A-1
18: B3 refrigerants are considered
- toxic but non-flammable
- toxic and highly flammable
- non-toxic but non-flammable
- non-toxic but flammable
19: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 1,000F
- 800F
20: 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
21: 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
- centrifugal switch
- duel-voltage switch
- printed circuit board (PCB)
22: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 13.9 lbs
- 44 lbs
23: What refrigerant is an inorganic compound?
- Ammonia
- R-132A
- R-22
- R-410A
24: The main purpose of the accumulator is to
- prevent liquid slugs at the compressor
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
- provide space for vapor to accumulate
25: Volts x amps equals
- Ohms Law
- Inductance
- Watts
- Impedance