Topics: All categories in the pool
1: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the high side
- upper chamber of the high side
- upper chamber of the low side
- lower chamber of the low side
2: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to release a sticking valve
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
3: A water regulating valve opens when
- the head pressure rises
- when the power is on
- the compressor is on
- when the power is on there is an overcharge of refrigerant
4: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
- shall be posted on the compressor shell or electrical panel at the unit
5: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Enthalpy
- Sensible heat
- Latent heat
- Specific heat
6: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- competent welder
- licensed welder
- licensed technician
- welder qualified
7: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
8: A rule of thumb in air conditioning is ____ CFM per ton?
- 600
- 100
- 500
- 400
9: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
10: A high side float is a
- 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 valve that controls the crankcase oil level
- float type switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the amount of refrigerant stored in the receiver
11: High pressure controls should be set no higher than
- 25% of set point
- 90% of set point
- 80% of set point
- 10% of set point
12: What device should be used on low-temperature freezers?
- hot-gas by-pass
- oil separator
- high capacity TXV
- discharge muffler
13: An oil pressure safety switch should be set at
- 5 to 10 psi above low side pressure
- 10-15 psi above low side pressure
- 10 to 15 psi below low side pressure
- 5 to 10 psi below low side pressure
14: Adjusting the spring pressure on a TXV
- changes subcooling
- adjusts the bulb charge
- makes no difference
- changes superheat
15: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
16: 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
17: Humidity can be sensed with
- pressure bellows
- human hair
- bimetal
- thermometer
18: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 5/8"
- 3/8"
- 3/4"
- 1/2"
19: The principle used in continuous type absorption systems is
- Dalton's Law
- Charles's Law
- Boyle's Law
- Ohm's Law
20: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the return air ducted system
- Machinery rooms need not be vented
- the outdoors
21: Transformers are rated in
- amps
- volts-ohms
- volts
- volt-amps
22: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 20' above grade
- At least 25' above grade
23: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EPR valve
- EEV
- Solenoid valve
- CPR valve
24: Halogen refrigerants are corrosive to which type of metal?
- magnesium
- black iron
- stainless steel
- copper
25: Liquid line filter-driers on a 410A system must be rated for no less than
- 200 psig
- 1000 psig
- 600 psig
- 400 psig