Topics: All categories in the pool
1: Booster compressors, pump refrigerant into the
- heat & plate heat exchanges
- receiver
- low side of the primary compressor
- high side of the secondary compressor
2: Low-side system leaks in a low-pressure chiller will often result in
- air being pulled into the system
- system refrigerant leaking from the system
- water being pulled into the system
- nitrogen leaking out of the system.
3: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
4: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- refrigerant control
- capacity control
5: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
- reduce friction loss to the flow of refrigerant
6: The generator shell contains the
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
- evaporator and the absorber
7: Fractionation occurs when
- the pressures increase as the heat load increases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- when a fraction of refrigerant is added as the full charge
- the pressures decreases as the heat load decreases
8: What is a Category "M" fluid?
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- A typical refrigerant used on newer air conditioning and heat pump systems
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
9: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- There is no minimum for relief valve and windows.
- At least 40'
- At least 20'
10: Halogenated refrigerants cannot be used with what material?
- Copper
- Stainless steel
- Aluminum
- Magnesium alloy
11: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
12: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
13: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
14: What is used to check very low pressure?
- Hygrometer
- Manometer
- Velometer
- Hydrometer
15: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
- GPM and friction head
16: A professional or office building would be considered what type of occupancy?
- public assembly
- business
- mercantile
- commercial
17: Which occupancy can ammonia be used in?
- depends on the quantity of freon
- industrial
- commercial
- redifential
18: What is Absolute Zero?
- -460F
- -773F
- -400F
- -640F
19: The Board of Boilers adopts by reference
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- MSCA Code
20: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- tower fans
- evaporation of the water droplets
- sensible heat
21: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- 2F difference
- a ling psychrometer doesn't have two theremometers.
- nearly the same
22: A device used to measure small pressure differences is the
- manometer
- phsycometirc
- pyrometer
- anemometer
23: How many BTU's is produced by one watt of energy
- 3.00
- 1
- 3.41
- 2.57
24: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Nothing must be done
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
25: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100