Topics: All categories in the pool
1: How many gallons of water per pound of ammonia do you need?
- 15
- 5
- 1
- 20
2: 746 watts is equal to
- 1 hp
- 10 hp
- 100 hp
- Pi
3: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
4: 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.
- 15
- 50
- 75
- 55
5: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 3/32"
- 1/8"
- 5/16"
6: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- PVC
- Stainless steel
7: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
8: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
9: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- any refrigerant direcly in contact with the cooling space for process cooling
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
10: What is the leaving chilled water set point for water chiller systems?
- 38F
- 66F
- 55F
- 45F
11: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
12: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
13: What device should be used on low-temperature freezers?
- discharge muffler
- hot-gas by-pass
- high capacity TXV
- oil separator
14: The solution that leaves the concentrator in an absorption chiller is referred to as the
- diluted solution
- absorbed solution
- weak solution
- strong solution
15: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
16: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
- Never can be allowed
- Approved by the authorized person
17: A movie theater would be considered a
- institutional occupancy
- mixed occupancy
- public assembly occupancy
- commercial occupancy
18: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
19: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
20: One atmosphere equals
- 14.7
- 29.4
- 0 psia
- 0 psig
21: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 106 amps
- 1,000 amps
- 1K amps
22: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
23: The Department that certifies the transportation of refrigerant is the
- RSES
- EPO
- EPA
- DOT
24: An oil pressure safety switch should be set at
- 10 to 15 psi below low side pressure
- 5 to 10 psi above low side pressure
- 5 to 10 psi below low side pressure
- 10-15 psi above low side pressure
25: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and the solution will evaporate.
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates