Topics: All categories in the pool
1: What is the refrigerant chlorodifluoromethane?
- R-123
- R-12
- R-134a
- R-22
2: 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
3: Usually dry bulb temperature is
- higher than wet bulb temperature
- same as wet bulb temperature
- lower than dry bulb temperature
- not important and shall be ignored
4: What refrigerant is an inorganic compound?
- R-132A
- R-410A
- R-22
- Ammonia
5: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
6: 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
- run voltage
- lift voltage
- boost voltage
- pick-up voltage
7: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- first disconnect in
8: Halo-carbon refrigerants cannot be used with what material?
- Stainless Steel
- Aluminum
- Copper
- Magnesium alloy
9: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
10: What would be the classification of a church?
- Institutional
- Industrial
- Large mercantile
- Place of assembly
11: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 144 BTU
- 12,000 BTU
- 24,000 BTU
12: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- too small evaporator
- overcharged
- starved evaporator
- compressor suction valve stuck open
13: R-11 belongs to Group
- B-3
- A-1
- B-1
- A-2
14: The low pressure oil safety switch
- never trips
- resets itself automatically
- must be reset manually
- resets itself after the time delay has terminated
15: On a TXV, the purpose of an external equalizer is to?
- Increase the pressure on the top of the power head diaphragm
- allow a greater adjustment spam
- compensate for a pressure drop across the evaporator coil
- balance the evaporator load
16: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on the oil used
- Based on worst case fractionation
- Based on best case Fractionation
17: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
18: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
19: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- institutional occupancy
- commercial occupancy
- public assembly occupancy
- illegal occupancy
20: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more concentrated
- Rust can form
- System operating pressure will drop
- The Li-Br solution will become more diluted
21: What refrigerant doesn't have to be classified?
- R-717
- R-134A
- R-422A
- R-718
22: Low pressure chiller systems use what type of compressor?
- Centrifugal
- Screw
- Reciprocating
- Scroll
23: The density of a gas refers to
- pounds per square foot
- cubic feet per pound
- pounds per cubic foot
- pounds per absolute pressure
24: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
25: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic but non-flammable
- toxic and highly flammable