Topics: All categories in the pool
1: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, paper method, and frost line.
- sight glass, weight, pressure, and dipstick
- sight glass, weight, pressure, and frost line
2: Class A refrigerants are considered
- toxic
- flammable
- non-toxic
- non-flammable
3: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- water sprayed over condenser
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
4: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
5: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- filter out impurities from the system
- store excess refrigerant from the reciver
- reduce friction loss to the flow of refrigerant
6: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
- is on where brine is cooled & circulated to the space refrigerated
- is a self-contained complete factory made and tested system
7: 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
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it plus 25% for fittigns
8: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- reset the expansion valve
- start the comrpessor
- start the fan and circulating pump
- reset the safety valve
9: Which refrigerant class listed below is the most flammable?
- B2
- A3
- C3
- A2
10: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- of Group B2 refrigerant shall be prohibited
11: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 6.6
- 330
- 110
- 1,000
12: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- 977.6 watts
- 9,776 watts
- .9776 watts
13: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- A field inspection shall be made before it is put into service
14: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 1,000F
- 800F
15: On a single phase motor, when does the start winding cut out?
- 25% of its RLA speed
- 100% of its RLA speed
- 75% of its RLA speed
- 50% of its RLA speed
16: Electricity involves the movement of electrons in atoms
- True
- False
17: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.2
- 2.2
- 1.5
18: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 257 psig, 77 psig
- 226 psig, 68 psig
- 350 psig, 120 psig
- 455 psig, 185 psig
19: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- read the nameplate data
- check with the utility company
- determine the capacity of the service panel
20: How many refrigerant classifications are there for toxicity?
- 1
- 3
- 5
- 2
21: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- 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
22: The reversing valve is commonly used
- on multiple compressor systems
- on commercial system that involve two different temperatures
- when the code requires a check valve
- on all heat pumps
23: R-11 has the greatest corrosive effect on
- Aluminum
- Magnesium
- Bronze
- Copper
24: Adjusting the spring pressure on a TXV
- makes no difference
- changes superheat
- adjusts the bulb charge
- changes subcooling
25: The proper location for an oil separator is between the
- compressor and condenser
- receiver and metering device
- evaporator and compressor
- condenser and receiver