Topics: All categories in the pool
1: Heat transferred by conduction from one body to another is done
- via radiation
- via liquids
- via heat rays
- via solids
2: How many refrigerant classifications are there for flammability?
- 1
- 7
- 2
- 3
3: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- ball valves
- companion or block valves
- gate or globe valves
- king valves
4: On a TXV, the purpose of an external equalizer is to?
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
5: In an electrical circuit, what is potential measured in?
- Volts
- Herys
- Amps
- Ohms
6: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
7: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- Stainless steel
- PVC
8: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- .5 CFM
- 20 CFM
- 5 CFM
9: Halogenated refrigerants cannot be used with what material?
- Copper
- Magnesium alloy
- Stainless steel
- Aluminum
10: Electricity involves the movement of electrons in atoms
- True
- False
11: A single pole-double throw switch uses how many wires?(excluding the ground)
- 2
- 5
- 4
- 3
12: An accumulator can be located between the
- evaporator and compressor
- condenser and evaporator
- compressor and condenser
- first stage and second stage compressors
13: If two 500 ohm resistors are connected in series, the resistance will be
- 500 ohms
- 1000 ohms
- 200 ohms
- 20 ohms
14: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 43.3 psig
- 70.8 psig
- 66.1 psig
15: A hotel is considered a _______ occupancy.
- institutional
- residential
- commercial
- mercantile
16: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from 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 failed connections will enter the unoccupied space
17: Heat is a form of
- work
- power
- matter
- energy
18: Who is permitted to access a refrigeration machine room?
- Contractors only
- Anyone, it's a completely safe area
- Authorized persons only
- Any employee
19: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
20: The Board of Boilers adopts by reference
- Montreal Protocol Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- MSCA Code
21: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution crystallizes.
- The machine will cool excessively as the solution evaporates
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
22: What would be the classification of a prison?
- Large mercantile
- Industrial
- Place of assembly
- Institutional
23: How many flammability classifications are refrigerants in?
- 7
- 5
- 3
- 2
24: The measurement of heat in a particular substance is
- enthalpy
- sensible heat
- latent heat
- specific heat
25: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 24.0 volts
- 240 volts
- 2,400 volts
- 2.40 volts