Topics: All categories in the pool
1: Who authorizes the form of certificate of completion of refrigeration systems that should be used?
- Massachusetts Board of Boiler Rules
- Supervisor or project manager in charge of the installation
- Owner
- Fire Marshal
2: A class B2 refrigerant is considered
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- toxic and non-flammable
3: Heat transferred by conduction from one body to another is done
- via radiation
- via solids
- via heat rays
- via liquids
4: It is permissible to use a single-pole switch on a 2 HP motor running at 240 volts as long as the switch is rated for at least 2x FLA.
- True
- False
5: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
6: Fractionation occurs when
- when a fraction of refrigerant is added as the full charge
- the pressures decreases as the heat load decreases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- the pressures increase as the heat load increases
7: A pressure relief should be located at least _______ from windows and doors.
- 15'
- 30'
- 20'
- 25'
8: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Board of Boilers
- Person who pulled the permit
- Person in charge of the facility
9: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UV”
- “UL”
- “U” or “UM”
- “UM” and “UV”
10: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- duel-voltage switch
- centrifugal switch
- printed circuit board (PCB)
- motor starter
11: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 7.00'
- 7.25'
- 8'4"
12: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
13: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
14: 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
15: It is permissible to use a single-pole switch on a 2 HP motor running at 240 volts as long as the switch is rated for at least 2x FLA.
- True
- False
16: How many gallons of water per pound of ammonia do you need?
- 20
- 15
- 5
- 1
17: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
18: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X amps.
- Watts X power factor
- Watts = volts X amps
19: What is the leaving chilled water set point for water chiller systems?
- 66F
- 38F
- 45F
- 55F
20: Dew point is
- the temperature below which water vapor in the air will start to condense
- the temperature of air of 50% RH
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
21: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
22: Three-phase motors have what type of windings?
- three start windings
- three run windings
- three run windings and 3 start windings
- one start winding and one run winding.
23: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
24: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- CO Sensing
- phosgene gas sening
- refrigerant sensing
- A group sensing
25: A High-Probability System
- 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
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area