Topics: All categories in the pool
1: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
2: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
3: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
4: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 60% Li-Br, 40% distilled water
- 40% Li-Br, 60% tap water
- 40% Li-Br, 60% distilled water
- 50% Li-Br, 50% tap water
5: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- CO Sensing
- A group sensing
- phosgene gas sening
- refrigerant sensing
6: A start capacitor is wired in _____ with the start windings.
- parallel
- series-parallel
- junction
- series
7: How are refrigerant blends classified?
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
- Based on best case Fractionation
8: Where is the high-side float located on a chiller system?
- flash line
- liquid line
- inside the chiller barrel
- discharge line
9: The Board of Boilers adopts by reference
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code
- MSCA Code
- the MACS Pressure Vessel Code of Massachusetts
10: Brazed joints melt at temperatures above
- 1,200F
- 1,000F
- 800F
- 500F
11: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusion plug
- rupture plug
- fusible plug
12: Liquid level gauges must be provided with what?
- A low level mark
- A red line
- Automatic shut-offs
- A relief valve
13: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
14: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- splurge
- merge
- surge
- purge
15: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 20
- 50
- 15
- 75
16: What device should be used on low-temperature freezers?
- oil separator
- discharge muffler
- hot-gas by-pass
- high capacity TXV
17: A self contained system
- is a complete factory made and tested system
- is a unit system Group II refrigerants only
- is a unit system Group I refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
18: Pi equals approximately
- 3.41
- 746
- 12,000
- 3.14
19: What is the leaving chilled water set point for water chiller systems?
- 45F
- 66F
- 55F
- 38F
20: What section of ASHRAE-15 governs pressure vessels?
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- OSHA
21: E = I X R is
- Amps Law
- Ohms Law
- Impedance Law
- Watts Law
22: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
23: 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
24: 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
25: 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