Topics: All categories in the pool
1: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Insulated and installed in a pipe duct (Encased)
- Certified
- Leak checked
- Classifed
2: What is Absolute Zero?
- -460F
- -400F
- -640F
- -773F
3: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Scroll
- Screw
- Centrifugal
4: Watt's Law indicates Volts X Amps = _________.
- Current
- Watts
- Ohms
- Resistance
5: Before replacing a seized compressor, the _______ should be determinded.
- designed head pressure
- current draw
- type of refrigerant
- cause of seizure
6: A positive displacement compressor is
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
7: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 100
- 90
- 110
- 80
8: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
- At least 25' above grade
9: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
10: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- System operating pressure will drop
- The Li-Br solution will become more diluted
- Rust can form
- The Li-Br solution will become more concentrated
11: Oils, classified as to source, are
- animal, vegetable, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- naphthalene, paraffin, and castor
12: Pressure is the equivalent of
- force per unit area
- area times force
- force
- force times area
13: Pi equals approximately
- 3.14
- 12,000
- 3.41
- 746
14: The most common type of motor starter is
- delts-wye starter
- across the line starter
- duel-winding starter
- part winding starter
15: What is an egress?
- An entrance or exit
- An escape route
- A valve put on the low side of the system to prevent frosting
- A code violation
16: Usually dry bulb temperature is
- higher than wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
- same as wet bulb temperature
17: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 212
- 180
- 970
18: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- 977.6 watts
- .9776 watts
- 9,776 watts
19: The External equalizer of a TXV compensates for
- pressure within the system
- pressure within the evaporator
- pressure drop across the evaporator coil
- pressure drop across the condenser coil
20: How are a compressor and condenser fan wired?
- parallel
- series-parallel
- series
- parallel-series
21: The first step in mechanical refrigeration is
- expansion
- compression
- evaporation
- condensation
22: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
23: The certificate of inspection
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted and protected from dirt, water, and other elements
- shall be posted on the compressor shell or electrical panel at the unit
24: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 2.0
- 3.0
- 5.5
25: 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