Topics: All categories in the pool
1: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more diluted
- Rust can form
- The Li-Br solution will become more concentrated
- System operating pressure will drop
2: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- OSHA
- Department of Energy
- ASHREA-15 Section 9.2.1
3: A VRF system is a direct system
- true
- false
4: Which of the following is NOT a positive displacement compressor?
- scroll
- screw
- reciprocating
- centrifugal
5: Lithium-bromide, Li-Br, is best characterized as a
- salt
- sugar
- sand
- soil
6: 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
7: The certificate of inspection
- 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
- shall be $20 and an additional fee of $1 for each tone above 20 tons
8: A device used to measure small pressure differences is the
- pyrometer
- phsycometirc
- anemometer
- manometer
9: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- red
- blue
- green
- orange
10: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
11: A EPR valve is installed on what type of evaporators?
- high-temperature evaporators
- low-temperature evaporators
- plate evaporators
- shell and tube evaporators
12: Relief valves are rated in
- pounds of air per minute
- gallons of water per hour
- gallons of water per minute
- pounds of air per hour
13: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Trucks, license plates, and uniforms
- Uniforms, checks, and invoices.
- Truck, office, every job, and on all equipment
14: Can you use Ammonia in industrial applications?
- When mixed with R-718
- Yes, Under certain condidtions
- Yes, always
- No, never
15: Liquid level gauges must be provided with what?
- A relief valve
- A low level mark
- A red line
- Automatic shut-offs
16: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-22
- R-123
- R-11
17: What refrigerant doesn't have to be classified?
- R-422A
- R-718
- R-134A
- R-717
18: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- There isn't enough information to answer.
- 2
- 2.5
- 1250
19: 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
- licensed welder
- welder qualified
- competent welder
20: Direct systems using Group II refrigerants
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
- shall be installed per instruction of the AHJ
- shall not be used for air condition for human comfort
21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-113
- R-11
- R-12
22: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
23: "E" references ____ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
24: 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 as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent of fittings multiplied by 2.31
25: What refrigerant doesn't have to be classifted?
- R-718
- R-711
- R-134a
- R-717