Topics: All categories in the pool
1: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “U” or “UM”
- “UV”
- “UM” and “UV”
- “UL”
2: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
3: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100
- 10,000
- 100,000
4: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
5: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Magnesium
- Zinc
- Nickel
- Copper
6: Name a reason that does not cause reduced condenser air quantity
- Dirty Coil
- Prevailing winds
- Dirty fan blades
- High ambient temperature
7: If your suction line is warmer than the room temperature, this may indicate
- an over charge
- a low charge
- below normal superheat
- plugged air filter
8: What is R-22?
- CCFCM
- HFC
- Chlorofluoromethane
- Chlorodifluoromethane
9: 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
10: A start capacitor in series with a start winding will
- increase the amp draw of the motor
- increase starting torque
- decrease the amp draw of the motor
- increase running efficiency
11: Relief valves are rated in
- pounds of air per minute
- gallons of water per hour
- pounds of air per hour
- gallons of water per minute
12: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
13: Class T machine room
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
14: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Certified
- Insulated and installed in a pipe duct (Encased)
- Classifed
- Leak checked
15: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
16: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- king valves
- ball valves
- gate or globe valves
- companion or block valves
17: The color code of a tank of ammonia is
- lavender
- white
- silver
- light green
18: The leaving chilled water set point for comfort cooling is typically?
- 45
- 38
- 60
- 66
19: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 330 lbs.
- 550 lbs
21: In a system designed for sub-zero ambient temperatures, what must be added?
- Low-ambient kit
- Booster compressor
- Infrared dye for leak identification
- Nitrogen
22: A thermometer inside a duct measures ____ heat.
- sensible
- hidden
- latent
- specific
23: R-22 falls under which safety classification?
- A-2
- B-2
- A-1
- B-1
24: Name three things that must be done when changing refrigeration lubricant?
- Make sure it's compatible, notify owner, notify AHJ
- You can't change lubricants.
- Place sign, check for leaks, insulate
- Nothing must be done
25: Pi equals approximately
- 3.41
- 746
- 3.14
- 12,000