Topics: All categories in the pool
1: How many gallons of water per pound of ammonia do you need?
- 1
- 15
- 5
- 20
2: When energized, a normally open relay will be
- closed
- noisy
- open
- depends on the type and class of the relay
3: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 80%
- 100%
- 75%
4: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- outside the machinery room
- compressor
- boiler
- evaporator
5: A micron is
- a larger unit of measurement than Hg
- one millonths of a micrometer
- one millonths of a centimeter
- one thousandths of a millimeter
6: 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
- merge
- splurge
- surge
- purge
7: Which oil is hydoscopic?
- polyolester
- mineral
- animal
- SW30
8: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 110
- 330
- 6.6
9: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a pressure relief device
10: On a TXV, the purpose of an external equalizer is to?
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
11: Which refrigerant is lighter than air?
- R-134a
- R-717
- R-123
- R-11
12: What does safe access mean?
- Well-lit exit signs
- Locked doors
- A clear unobstructed path to the equipment and controls
- OSHA approved
13: 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
14: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
15: In a horizontal shell & tube condenser, the ammonia is liquefied by
- water sprayed over condenser
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
- removing the latent heat of vaporization
16: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- underfeed the evaporator
- overfeed the evaporator
17: Total heat of a substance is considered
- specific heat
- sensible heat
- empathetical
- enthalpy
18: 746 watts is equal to
- Pi
- 100 hp
- 10 hp
- 1 hp
19: What section governs pressure vessels?
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- OSHA
- Section ASHREA 34
20: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
21: The difference between saturated liquid and saturated vapor is
- pressure
- temperature
- volume
- heat
22: The most common type of motor starter is
- part winding starter
- across the line starter
- delts-wye starter
- duel-winding starter
23: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
24: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
25: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above