Topics: All categories in the pool
1: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
2: 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
3: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- lost heat
- specific heat
- sensible heat
- latent heat
4: When the compressor is below the condensor
- traps are needed on the oil return line
- traps are not needed on this type of system
- traps are needed on the discharge line
- traps are needed on the suction line
5: 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
6: Horizontal piping should be run level.
- Yes, if the condenser is located above the evaporator
- False
- No, unless the supervisor on the job says so.
- True
7: How many closing forces operate a thermostatic expansion valve?
- 1
- 4
- 2
- 3
8: An oil pressure safety switch should be set at
- 5 to 10 psi below low side pressure
- 10-15 psi above low side pressure
- 5 to 10 psi above low side pressure
- 10 to 15 psi below low side pressure
9: On a single phase motor, when does the start winding cut out?
- At 50% of its full rated speed
- Start windings do no cut-out of the run cycle
- At 25% of its full rated speed
- At 75% of its full rated speed
10: An accumulator can be located between the
- condenser and evaporator
- first stage and second stage compressors
- compressor and condenser
- evaporator and compressor
11: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
12: Increasing superheat will do what to your system?
- Nothing
- Increase gas flow
- Decrease liquid flow
- Increase liquid flow
13: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- leak checked
- insulated
14: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
15: What instrument is used to measure very high resistance?
- meg ohmmeter
- tape measure
- ammeter
- voltmeter
16: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 2
- 3
- 5
17: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 33
- 18
18: Capacity control on an absorption system is typically accomplished by varying the
- pressure setting on the system's rupture disc
- speed of the chilled water circulatory pump
- speed of the condenser water circulator pump
- rate at which heat is supplied to the generator
19: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- too small evaporator
- starved evaporator
- compressor suction valve stuck open
- overcharged
20: In a horizontal shell & tube condenser, the ammonia is liquefied by
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
- removing the latent heat of vaporization
- water sprayed over condenser
21: Which of the following is not an air velocity meter?
- Anemotherm
- Velometer
- Anemometer
- Hydrometer
22: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- institutional occupancy
23: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
24: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-12
- R-113
- R-502
25: The best way to detect ammonia in brine is
- potassium of line
- nessler regaent
- carbonation of soda
- CO2 gas