Topics: All categories in the pool
1: A start capacitor is wired in _____ with the start windings.
- series
- junction
- parallel
- series-parallel
2: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
3: A thermometer inside a duct measures ____ heat.
- hidden
- sensible
- latent
- specific
4: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
5: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Classifed
- Certified
- Leak checked
- Insulated and installed in a pipe duct (Encased)
6: Ammonia (NH3) is a group III refrigerant
- True
- False
7: In an ammonia refrigeration system, a low oil pressure switch trips. What happens?
- Emergency oil pump starts
- Condenser & evaporator CFMs increase
- The switch resets within 10 seconds
- Compressor shuts down
8: A capacitor in series with the start windings will do what?
- Increase starting torque
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
- Nothing
9: If you have a motor of 2 HP or less and under 300V, you can use a single pole switch (light switch) with what rating?
- 5x FLA
- 3x FLA
- 4x FLA
- 2x FLA
10: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Coated
- Certified
- Encased
11: R-717 is
- ammonia
- trichloromethane
- carbon dioxide
- water
12: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
13: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 25
- 10
- 15
- 20
14: All serviceable components of a refrigeration system shall be provided with
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
- safe access
15: How far from the ground does a relief valve need to be?
- At least 25' above grade
- At least 20' above grade
- Not more than 3' above grade
- At least 15' above grade
16: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Add refrigerant
- Have it inspected
- Document the superheat and subcooling reading
17: Class 3 refrigerants are
- non-toxic
- toxic
- non-flammable
- highly flammable
18: A class B2 refrigerant is considered
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- toxic and non-flammable
19: 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
- 50
- 350
- 100
20: Capacity control on an absorption system is typically accomplished by varying the
- pressure setting on the system's rupture disc
- rate at which heat is supplied to the generator
- speed of the chilled water circulatory pump
- speed of the condenser water circulator pump
21: What type of relief valve is used on a CO2 system?
- glove disc
- fusible plug
- gate valve
- rupture disc
22: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
23: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more concentrated
- System operating pressure will drop
- Rust can form
- The Li-Br solution will become more diluted
24: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class A machinery room
- Class B machinery room
- Class M machinery room
25: Adjusting the spring pressure on a TXV
- changes subcooling
- changes superheat
- adjusts the bulb charge
- makes no difference