Topics: All categories in the pool
1: 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
- licensed technician
- welder qualified
- licensed welder
- competent welder
2: 1 Watt = ______ BTU's?
- 4.482
- 3.412
- 7.216
- 12
3: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
4: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
5: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
6: A high side float is a
- float type switch that stops the compressor when the pressure on the high side becomes too high
- 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 amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
7: Transformers are rated in
- volts
- volts-ohms
- amps
- volt-amps
8: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
9: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- air being pulled into the system
- nitrogen leaking out of the system.
- water being pulled into the system
10: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 24
- 75
- 50
- 100
11: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 10 amps
- 20 amps
- There isn't enough information to answer.
- 24 amps
12: Total heat of a substance is considered
- empathetical
- sensible heat
- specific heat
- enthalpy
13: Which refrigerant class listed below is the most flammable?
- B2
- A2
- C3
- A3
14: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 330
- 110
15: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Encased
- Certified
16: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- low pressure
- high pressure
- design pressure
17: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
18: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
- you can never change refrigerants
19: If the power element of an expansion valve should lose its charge the valve would
- go closed
- go open
- underfeed the evaporator
- overfeed the evaporator
20: Heat transferred by conduction from one body to another is done
- via liquids
- via radiation
- via solids
- via heat rays
21: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 5 CFM
- 15 CFM
- 20 CFM
22: The most common type of motor starter is
- delts-wye starter
- across the line starter
- duel-winding starter
- part winding starter
23: Ammonia is under what safety classification?
- A3
- B1
- B2
- B3
24: Gauge pressure is
- Absolute pressrue
- Barometric pressure
- Force of pressure above that of atmosphere
- Atmospheric pressure
25: The main purpose of the accumulator is to
- prevent liquid slugs at the compressor
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
- provide space for vapor to accumulate