Topics: All categories in the pool
1: All serviceable components of a refrigeration system shall be provided with
- safe access
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- service manuals
- manufactures instructions on start-up procedures
2: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
3: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
4: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- institutional occupancy
5: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
6: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
7: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
8: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
9: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
10: Trichlorofluoromethane is the name of what refrigerant?
- R-12
- R-11
- R-502
- R-113
11: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-1
- A-2
- B-1
- B-2
12: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
- water being pulled into the system
- air being pulled into the system
13: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
14: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-22
- R-11
- R-123
15: A tachometer is an instrument used to measure
- RPM
- air velocity
- static pressure
- speed
16: The freezing point of water at sea level is?
- 32F
- 32C
- 0F
- -10C
17: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Saturated temperature
- Dry bulb temperature
- Wet bulb temperature
- Critical temperature
18: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
19: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
20: Which refrigerant class listed below is the most flammable?
- C-3
- A-3
- B-2
- A-1
21: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 250
- 350
- 100
- 400
22: 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.
- “UL”
- “UV”
- “U” or “UM”
- “UM” and “UV”
23: Capacity control on a centrifugal compressor is accomplished by the
- post-rotational guide vanes
- pre-rotational guide vanes
- check valves
- slide vanes
24: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 100
- 24
- 75
25: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above