Topics: All categories in the pool
1: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 88
- 38
- 58
- 96
2: Ammonia (NH3) is a group III refrigerant
- True
- False
3: Which winding have the most turns?
- Start
- they have equal amount of turns
- run
- depends on the motor phase
4: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
5: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Low Pressure displacement
- Non-positive displacement
6: The formula for Pure Power in a resistance circuit is
- Watts = volts X amps
- Kw = volts X amps
- Watts X amps.
- Watts X power factor
7: Which is considered the more efficient condenser?
- air cooled
- water cooled
- fan cooled
- spray cooled
8: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
9: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Cascade
- Low pressure
- Simple
10: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Aluminum
- Copper
- Magnesium alloy
11: High pressure controls should be set no higher than
- 10% of set point
- 25% of set point
- 80% of set point
- 90% of set point
12: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
13: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
14: Which oil is hydoscopic?
- mineral
- polyolester
- SW30
- animal
15: How many opening forces operate a thermostatic expansion valve?
- 2
- 4
- 3
- 1
16: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 100%
- 80%
- 90%
17: The density of a gas refers to
- pounds per square foot
- cubic feet per pound
- pounds per absolute pressure
- pounds per cubic foot
18: The gauge thickness required on a CO2 tank construction is
- 1/8"
- 1/16"
- 5/16"
- 3/32"
19: A hissing noise at the expansion valve is a good indication that
- expansion valve is oversized
- nothing is passing thru
- gas is passing thru it
- liquid is passing thru it
20: Give an example of a secondary coolant?
- R-410A
- R-717
- R-718
- R-12
21: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- evaporator
- outside the machinery room
- compressor
- boiler
22: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 9 ASHRAE-15 ASME VIII unfired
23: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
24: The leaving chilled water set point for comfort cooling is typically?
- 45
- 66
- 60
- 38
25: Ohm's Law indicates Amps X Resistance = ___________.
- Volts
- Current
- Ohms
- Impedance