Topics: All categories in the pool
1: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
2: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Insulated and installed in a pipe duct (Encased)
- Classifed
- Certified
3: How many flammability classifications are refrigerants in?
- 2
- 7
- 5
- 3
4: Which occupancy can ammonia be used in?
- redifential
- depends on the quantity of freon
- industrial
- commercial
5: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low suction pressure and low discharge pressure
- High head pressure and low suction pressure
- High suction pressure and high discharge pressure.
- Low head pressure and high suction pressure
6: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 18
- 15
- 24
7: On a centrifugal compressor, stationary diffuser vanes are needed to
- stop gas flow
- increase the clearance space
- prevent high pressure on the packing
- convert velocity energy to pressure
8: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 550
- 350
- 100
- 50
9: What must be done to refrigerant pipes before being buried?
- Certified
- Leaked checked
- Encased
- Coated
10: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
11: While water is evaporated in an evaporative condenser the impurities which were in the water are
- remain in the air
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
- accumulate in the sump water
12: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Nesting scrolls
- Fan-like action
- Suction and discharge valves
- Rotating vanes
13: A direct system
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
14: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Stainless steel
- Copper
15: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 600 watts
- 1000 watts
- 5KW
16: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 1.6 amps
- 1K amps
- 106 amps
17: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
18: The proper location for an oil separator is between the
- evaporator and compressor
- compressor and condenser
- receiver and metering device
- condenser and receiver
19: Before replacing a seized compressor, the _______ should be determinded.
- current draw
- type of refrigerant
- cause of seizure
- designed head pressure
20: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 155F
- 32F
- 158F
- 45F
21: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Stop valve
- Foot valve
- Moisture indicator
- Muffler
22: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Never can be allowed
- Approved by the installing contractor
- Only when combustion air is provided from outside of the machinery room
23: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Welded and seamed.
- Flanged and gasketed
- Insulated and cross broke
24: Oils, classified as to source, are
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
25: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- PSIA
- Pounds of air per minute.