Topics: All categories in the pool
1: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
2: Two systems using separate refrigerants that are superimposed upon one another is called
- booster
- cascade
- indirect
- single stage
3: A halide torch is most useful with a freon compression system
- to release a sticking valve
- to sweat flanges on the refrigeration piping
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
4: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
5: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- a ling psychrometer doesn't have two theremometers.
- 2F difference
- nearly the same
6: How many gallons of water per pound of ammonia do you need?
- 5
- 15
- 1
- 20
7: Which creates more of a heat load?
- 30% RH
- 70% RH
- 50% RH
- 90% RH
8: What would be the classification of a church?
- Industrial
- Large mercantile
- Place of assembly
- Institutional
9: Before replacing a seized compressor, the _______ should be determinded.
- designed head pressure
- type of refrigerant
- current draw
- cause of seizure
10: What is an egress?
- An escape route
- A code violation
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
11: What is used to check very low air pressures in air conditioning duct?
- Manometer
- Barometer
- Anemomter
- Vacuum gauge
12: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
13: A hissing noise at the expansion valve is a good indication that
- nothing is passing thru
- expansion valve is oversized
- gas is passing thru it
- liquid is passing thru it
14: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Simple
- Low pressure
- Cascade
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.
- 455 psig, 185 psig
- 257 psig, 77 psig
- 350 psig, 120 psig
- 226 psig, 68 psig
16: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
17: Which of the following is an example of an azeotropic refrigerant?
- R-500
- R-404A
- R-410A
- R-134A
18: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
19: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 500 lbs
- 660 lbs
- 330 lbs
21: "I" represents ____ in the Ohm's law formula.
- voltage.
- resistance
- capacitance
- amperage
22: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
- a fusible plug
- either a fusible plug or a pressure relief device
23: A chiller entering and leaving temperature difference is?
- 50 degrees F
- 20 degrees F
- 5 degrees F
- 10 degrees F
24: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
25: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above