Topics: All categories in the pool
1: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 3
- 2
- 1
2: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
3: By using nitrogen within a pipe during brazing operation,
- Copper oxide formation is prevented
- Discoloration is prevented
- The explosion hazard is confined
- Exterior scale formation is minimized
4: Large mercantile occupancy is
- 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 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 1500 persons congregate on levels above or below street level to purchase personal merchandise
5: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
6: Which of the following is an example of an azeotropic refrigerant?
- R-134A
- R-404A
- R-410A
- R-500
7: R-11 belongs to Group
- B-1
- A-1
- B-3
- A-2
8: Ammonia belongs to Group
- A-2
- B-2
- B-1
- A-1
9: Volts x amps equals
- Watts
- Inductance
- Ohms Law
- Impedance
10: RPM's of a centrifugal compressor are at approximately?
- 15,000
- 10,000
- 500
- 30,000
11: E = I X R is
- Watts Law
- Ohms Law
- Impedance Law
- Amps Law
12: If your suction line is warmer than the room temperature, this may indicate
- below normal superheat
- an over charge
- a low charge
- plugged air filter
13: The location of a thermal bulb of a TXV affects
- the amount of liquid refrigerant in the evaporator
- the amount of liquid in the condenser.
- subcooling
- the amount of liquid returning to the compressor
14: What is an example of institutional occupancy?
- Dorms
- Football stadium
- Shopping mall
- Hospital
15: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- absolute pressure
- force of pressure above that of atmospheric
- atmospheric pressure
16: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class M machinery room
- Class T machinery room
- Class B machinery room
17: 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”
- “UM” and “UV”
- “U” or “UM”
18: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- False
- True
- depends on the type of refrigerant being used
- are obsolete.
19: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
20: Booster compressors, pump refrigerant into the
- receiver
- heat & plate heat exchanges
- high side of the secondary compressor
- low side of the primary compressor
21: Heat is a form of
- power
- work
- matter
- energy
22: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
23: How many flammability classifications are refrigerants in?
- 3
- 5
- 2
- 7
24: 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 authorized person
- Approved by the installing contractor
- Never can be allowed
25: How many opening forces operate a thermostatic expansion valve?
- 2
- 3
- 1
- 4