Topics: All categories in the pool
1: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
2: What does safe access mean?
- OSHA approved
- Locked doors
- A clear unobstructed path to the equipment and controls
- Well-lit exit signs
3: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- .5 CFM
- 20 CFM
- 5 CFM
4: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- lower chamber of the low side
5: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- surge
- purge
- merge
- splurge
6: The two basic types of evaporators are
- flooded and direct expansion
- direct expansion and plate
- finned and plate
- prime surface and finned
7: Capacity control on an absorption system is typically accomplished by varying the
- speed of the chilled water circulatory pump
- pressure setting on the system's rupture disc
- speed of the condenser water circulator pump
- rate at which heat is supplied to the generator
8: What are the three components of a transformer?
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
9: A start capacitor in series with a start winding will
- increase starting torque
- decrease the amp draw of the motor
- increase running efficiency
- increase the amp draw of the motor
10: Control systems can be classified by
- source of power
- safety
- economy of operation
- tonnage of system
11: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 2%
- 4%
- 1%
- 25%
12: "I" represents ____ in the Ohm's law formula.
- amperage
- resistance
- capacitance
- voltage.
13: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Fusible plug
- Gate valve
- Glove valve
14: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 2
- 1250
- There isn't enough information to answer.
- 2.5
15: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- True
- are obsolete.
- False
- depends on the type of refrigerant being used
16: The first step in mechanical refrigeration is
- compression
- evaporation
- condensation
- expansion
17: What is potential measured in?
- Ohms
- Amps
- Henrys
- Volts
18: A start capacitor is wired in _____ with the start windings.
- series
- junction
- series-parallel
- parallel
19: The principle used in continuous type absorption systems is
- Ohm's Law
- Charles's Law
- Dalton's Law
- Boyle's Law
20: How many groups of refrigerants are there?
- 3
- 5
- 7
- 1
21: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
22: What is the refrigerant chlorodifluoromethane?
- R-134a
- R-123
- R-12
- R-22
23: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- the gas returns to a liquid
- any decrease in pressure will cause condensation
- any increase in pressure will not liquefy the gas
24: "E" represents _____ in the Watt's law formula.
- reactance
- amperage
- watts
- voltage
25: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -40F to 0F
- 0F-38F
- 30F to 50F
- -100F to -40F