Topics: All categories in the pool
1: Indirect systems using Group II refrigerants
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used in refrigeration system less than 1,000 lbs
2: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
3: Can you use Ammonia in industrial applications?
- When mixed with R-718
- Yes, Under certain condidtions
- No, never
- Yes, always
4: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
5: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 116
- 38
- 88
- 108
6: Foaming of oil in a compressor is most likely to occur
- at start-up
- when the evaporator temperatures are below 32F
- when ambient temperature are low
- when there is insufficient air across the condenser(i.e., dirty coil)
7: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
8: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
9: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Enthalpy
- Specific heat
- Sensible heat
- Latent heat
10: Volts x amps equals
- Inductance
- Impedance
- Ohms Law
- Watts
11: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
12: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- bi-annually
- regularly
- quarterly
13: The density of a gas refers to
- cubic feet per pound
- pounds per absolute pressure
- pounds per cubic foot
- pounds per square foot
14: Pi equals approximately
- 3.41
- 3.14
- 746
- 12,000
15: Transformers are rated in
- amps
- volt-amps
- volts-ohms
- volts
16: The oil separator is always inserted in the system
- to prevent oil logging
- where it can be easily serviced
- in the discharge line
- in a cool spot
17: E = I X R is
- Ohms Law
- Watts Law
- Impedance Law
- Amps Law
18: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
19: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- underfeed the evaporator
- overfeed the evaporator
20: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 15
- 25
- 10
21: The most common type of motor starter is
- duel-winding starter
- delts-wye starter
- across the line starter
- part winding starter
22: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- leak checked
- insulated
- installed through a pipe casing
23: Thermodynamics is the branch of science that deals with
- energy due to motion
- heat energy
- molecular therory
- state of energy
24: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three start windings
- three run windings and 3 start windings
- three run windings
25: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator