Topics: All categories in the pool
1: What is an egress?
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
- An escape route
- A code violation
2: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 110
- 6.6
- 1,000
3: 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”
- “UM” and “UV”
- “U” or “UM”
- “UV”
4: A high side float is a
- float type valve that controls the crankcase oil level
- float type valve that controls the amount of refrigerant stored in the receiver
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
5: Humidity can be sensed with
- bimetal
- pressure bellows
- thermometer
- human hair
6: Before replacing a seized compressor, the _______ should be determinded.
- type of refrigerant
- cause of seizure
- current draw
- designed head pressure
7: The best way to detect ammonia in brine is
- CO2 gas
- potassium of line
- carbonation of soda
- nessler regaent
8: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
9: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
10: Cooling tower lowers condenser water temp by
- condensation
- running fans at 100%
- evaporative cooling
- running water thru a secondary heat exchanger
11: At higher altitudes, boiling temperatures
- decrease
- depends on the refrigerant
- increase
- are unaffected
12: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 25
- 10
- 15
13: Can you use Ammonia in industrial applications?
- Yes, always
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
14: What must be done to refrigerant pipes before being buried?
- Coated
- Encased
- Leaked checked
- Certified
15: In a system designed for sub-zero ambient temperatures, what must be added?
- Nitrogen
- Infrared dye for leak identification
- Low-ambient kit
- Booster compressor
16: What would be the classification of a church?
- Large mercantile
- Place of assembly
- Institutional
- Industrial
17: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
18: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
19: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 5
- 3
- 2
20: The principle used in continuous type absorption systems is
- Charles's Law
- Ohm's Law
- Dalton's Law
- Boyle's Law
21: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- lift voltage
- boost voltage
- run voltage
- pick up voltage
22: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Muffler
- Moisture indicator
- Stop valve
23: On a TXV, the purpose of an external equalizer is to?
- compensate for a pressure drop across the evaporator coil
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- allow a greater adjustment spam
24: What's the most efficient condenser type?
- Shell and tube
- Air cooled fins
- Both are equal in efficiency
- None of the above
25: Ammonia vaporization takes place at what temperature?
- -460F
- -32F
- -28F
- -110F