Topics: All categories in the pool
1: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
2: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
3: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
- Self-closing doors
4: What section of ASHRAE-15 governs pressure vessels?
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
5: A tachometer is an instrument used to measure
- speed
- air velocity
- static pressure
- RPM
6: Electricity involves the movement of electrons in atoms
- True
- False
7: A EPR valve is installed on what type of evaporators?
- plate evaporators
- low-temperature evaporators
- high-temperature evaporators
- shell and tube evaporators
8: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class B machinery room
- Class M machinery room
- Class A machinery room
9: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- first disconnect in
- breaker panel in
10: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
11: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- There isn't enough information to answer.
- 24 amps
- 10 amps
12: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 4%
- 1%
- 25%
- 2%
13: Halo-carbon refrigerants cannot be used with what material?
- Magnesium alloy
- Copper
- Stainless Steel
- Aluminum
14: Which of the following is an example of an azeotropic refrigerant?
- R-410A
- R-404A
- R-500
- R-134A
15: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 257 psig, 77 psig
- 226 psig, 68 psig
- 455 psig, 185 psig
- 350 psig, 120 psig
16: A class B2 refrigerant is considered
- non-toxic and highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
17: What section governs pressure vessels?
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- OSHA
18: How are safety controls wired in a circuit?
- Parallel
- Either series or parallel
- Series
- Series/parallel
19: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 50
- 55
- 15
20: Which creates more of a heat load?
- 70% RH
- 30% RH
- 90% RH
- 50% RH
21: The leaving chilled water set point for comfort cooling is typically?
- 45
- 60
- 38
- 66
22: The location of a thermal bulb of a TXV affects
- subcooling
- the amount of liquid returning to the compressor
- the amount of liquid in the condenser.
- the amount of liquid refrigerant in the evaporator
23: A restaurant is classified as a
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
- public assembly occupancy
24: If your suction line is warmer than the room temperature, this may indicate
- an over charge
- plugged air filter
- below normal superheat
- a low charge
25: Low pressure systems have what kind of compressor?
- Rotary
- Scroll
- Centrifugal
- Reciprocating