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 concentrated
- Rust can form
- System operating pressure will drop
- The Li-Br solution will become more diluted
2: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
3: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
4: Copper and its alloys shall not be used with ammonia
- True
- False
5: Sublimation occurs when
- gas is formed from a liquid
- ice melts and turns to water
- gas is formed directly from a solid
- liquid is formed from a gas
6: Start to Run windings will have what resistance?
- The least resistance value
- Somewhere between the actual start winding and run winding resistance value
- The most resistance value
- All will be at equal values
7: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 1
- 5
8: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on the oil used
- Based on worst case fractionation
- Based on best case Fractionation
9: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 3.415
- 6.830
- 34.15
- 16.64
10: Sensible heat is the heat added to a substance to
- change its state
- cause evaporation
- freeze it
- raise its temperature
11: The actual expansion curve of compressor follows most nearly which one of the following
- Isothermal
- Adiabatic
- Volume
- Pressure-Temperature
12: "R" represents ___ in the Ohm's law formula
- voltage
- resistance
- amperage
- capacitance
13: Pipe identification labels are required when the system contains more than
- 110 lbs
- 55 lbs
- 120 lbs
- 65 lbs
14: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Gate valve
- Fusible plug
- Rupture disk
15: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
16: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- quarterly
- bi-annually
- annually
17: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
18: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
19: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
20: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 550
- 50
- 350
21: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- zone valve
- pressure relief device
- low limit control
22: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
23: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
24: Which winding have the most turns?
- run
- Start
- depends on the motor phase
- they have equal amount of turns
25: Booster compressors, pump refrigerant into the
- heat & plate heat exchanges
- receiver
- low side of the primary compressor
- high side of the secondary compressor