Topics: All categories in the pool
1: What is R-22?
- Chlorodifluoromethane
- HFC
- CCFCM
- Chlorofluoromethane
2: One atmosphere equals
- 0 psig
- 29.4
- 0 psia
- 14.7
3: Which of the following is NOT a positive displacement compressor?
- centrifugal
- reciprocating
- scroll
- screw
4: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
5: An accumulator can be located between the
- compressor and condenser
- condenser and evaporator
- evaporator and compressor
- first stage and second stage compressors
6: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
7: "I" represents ____ in the Ohm's law formula.
- voltage.
- resistance
- amperage
- capacitance
8: R-22 is considered a(n)
- HCFC
- CFC
- HCFCH
- HFC
9: What is the purpose of a surge capacitor on a contactor?
- to protect low voltage equipment
- to provide smoother start/stops
- to keep the contactor pulled in
- to balance the sine waves
10: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
11: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 38
- 96
- 88
- 58
12: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and the solution will evaporate.
13: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Upon installation
- Annually and when installed
14: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
15: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- refrigerant control
- capacity control
16: Class A refrigerants are considered
- non-flammable
- non-toxic
- flammable
- toxic
17: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 2 months
- 14 days
- 1 week
18: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 330 lbs.
- 550 lbs
19: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
20: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Decrease
- Nothing
- Increasae
21: In a motor, an internal overload might open if
- there's an excess current draw through the motor
- there's an open start winding
- there was a high pressure refrigerant was used for a low pressure system.
- there's a direct short
22: What is an egress?
- A valve put on the low side of the system to prevent frosting
- A code violation
- An escape route
- An entrance or exit
23: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 70F
- 58F
- 32F
- 77F
24: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
25: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above