Topics: All categories in the pool
1: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 255 psig
- 125 psig
- 327 psig
2: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
3: The instrument used to measure the specific gravity of absorption chiller solutions is the
- anemometer
- Psychrometer
- refractometer
- hydrometer
4: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
5: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Simple
- Low pressure
- R-414B
- Cascade
6: The generator shell contains the
- condenser and the absorber
- condenser and the generator
- evaporator and the absorber
- condenser, the evaporator, and the generator
7: When energized, a normally open relay will be
- noisy
- depends on the type and class of the relay
- open
- closed
8: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
9: Which refrigerant class listed below is the most flammable?
- B-2
- A-3
- A-1
- C-3
10: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the return air ducted system
- Machinery rooms need not be vented
- the outdoors
11: One ton of refrigeration is defined as ______ btu/minute.
- 720,000
- 60
- 12,000
- 200
12: What is used to check very low pressure?
- Hydrometer
- Manometer
- Hygrometer
- Velometer
13: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
14: RPM's of a centrifugal compressor are at approximately?
- 30,000
- 15,000
- 500
- 10,000
15: One atmosphere equals
- 0 psia
- 29.4
- 14.7
- 0 psig
16: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- lower chamber of the low side
- upper chamber of the low side
- lower chamber of the high side
17: Which winding have the most turns?
- depends on the motor phase
- run
- they have equal amount of turns
- Start
18: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- reduce friction loss to the flow of refrigerant
- filter out impurities from the system
- store excess refrigerant from the reciver
19: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
20: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Anyone, it's a completely safe area
- Contractors only
- Any employee
21: 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
22: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
23: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- starved evaporator
- too small evaporator
- compressor suction valve stuck open
- overcharged
24: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 14 days
- 30 days
- 1 week
- 2 months
25: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- leak checked
- insulated
- installed through a pipe casing