Topics: All categories in the pool
1: What is Trichlorotrifluoromethane?
- R-12
- R-13
- R-113
- R-11
2: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
3: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- condenser
- service valve
4: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- motor starter
- printed circuit board (PCB)
- centrifugal switch
- duel-voltage switch
5: Where must a refrigeration contractor's license number be displayed?
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Uniforms, checks, and invoices.
6: What is NOT a positive displacement compressor.
- Rotary
- Reciprocating
- Scroll
- Centrifugal
7: A water regulating valve opens when
- the head pressure rises
- the compressor is on
- when the power is on
- when the power is on there is an overcharge of refrigerant
8: 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
9: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there is a space 6' or more above it
- When its white
- When it's used as part of a supply or return air system
- When there are sprinklers above
10: How are safety controls wired in a circuit?
- Either series or parallel
- Series
- Series/parallel
- Parallel
11: What is Absolute Zero?
- -773F
- -460F
- -400F
- -640F
12: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
13: One atmosphere equals
- 29.4
- 0 psia
- 0 psig
- 14.7
14: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
15: Fractionation occurs when
- the pressures decreases as the heat load decreases
- when a fraction of refrigerant is added as the full charge
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- the pressures increase as the heat load increases
16: How many gallons of water per pound of ammonia do you need?
- 15
- 20
- 1
- 5
17: A relief valve shall be located at least ___ above grade.
- 15'
- 25'
- 36'
- 10'
18: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-113
- R-11
- R-12
- R-22
19: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 255 psig
- 365 psig
- 125 psig
- 327 psig
20: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
21: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- RPM and CFM increase
- CFM and RPM decrease
- CFM and HP increase
- CFM and HP decrease
22: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent of fittings multiplied by 2.31
23: What type refrigerant is NOT ozone depleting?
- HCFC
- HFC
- CFC
- Halon
24: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
25: A restaurant is classified as a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy