Topics: All categories in the pool
1: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
2: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
3: Low pressure chiller systems use what type of compressor?
- Centrifugal
- Reciprocating
- Scroll
- Screw
4: An electronic bridge circuit is basically a
- high voltage circuit
- suspension
- 24 volt control circuit
- Wheatstone
5: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
6: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- ammonia
- trichlorotrifluoromethane
- R-718
- methyl chloride
7: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- oil in evaporator
- not enough oil in the system
- moisture in the system
- low head pressure
8: Thermodynamics is the branch of science that deals with
- heat energy
- molecular therory
- state of energy
- energy due to motion
9: Large mercantile occupancy is
- 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
- 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
10: What is Trichlorotrifluoromethane?
- R-13
- R-113
- R-11
- R-12
11: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
12: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
13: The low pressure oil safety switch
- never trips
- resets itself after the time delay has terminated
- resets itself automatically
- must be reset manually
14: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
15: Capacity control on a centrifugal compressor is accomplished by the
- slide vanes
- pre-rotational guide vanes
- check valves
- post-rotational guide vanes
16: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
17: A low oil switch is typically
- automatic reset
- manual reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
18: What is the voltage of each leg of a 480 Volt three-phase motor?
- 277v
- 120v
- 208v
- 240v
19: Which winding have the most turns?
- Start
- depends on the motor phase
- run
- they have equal amount of turns
20: The freezing point of water at sea level is?
- 32C
- 0F
- 32F
- -10C
21: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
22: "E" references ____ in the Ohm's law formula
- voltage
- resistance
- amperage
- capacitance
23: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would make the condenser more efficient
- it would make the condenser less efficient
- it would have no effect on the condenser
- it would cause the condenser to sweat
24: NH3 is
- ammonia
- lithium bromide
- R-718
- R-508A
25: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- ball valves
- gate or globe valves
- king valves