Topics: All categories in the pool
1: A relief valve shall be located at least ___ above grade.
- 10'
- 15'
- 36'
- 25'
2: The critical temperature of a refrigerant gas occurs when
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
3: In a motor, an internal overload might open if
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
- there's a direct short
4: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- lower
- higher
- the same
5: A start capacitor is wired in _____ with the start windings.
- series-parallel
- junction
- series
- parallel
6: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 600F
- 700F
- 1000F
7: What refrigerant doesn't have to be classifted?
- R-711
- R-717
- R-134a
- R-718
8: Where is the high-side float located on a chiller system?
- discharge line
- flash line
- inside the chiller barrel
- liquid line
9: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or more
10: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Make sure it's compatible, notify owner, notify AHJ
- Place sign, check for leaks, insulate
- Nothing must be done
11: An electronic bridge circuit is basically a
- high voltage circuit
- 24 volt control circuit
- Wheatstone
- suspension
12: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
13: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- A-2
- B-1
- B-2
14: Can you use Ammonia in industrial applications?
- No, never
- Yes, always
- When mixed with R-718
- Yes, Under certain condidtions
15: How many groups of refrigerants are there?
- 5
- 3
- 7
- 1
16: What section of ASHRAE-15 governs pressure vessels?
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
- Section 9 ASHRAE-15 ASME VIII unfired
17: Thermodynamics is the branch of science that deals with
- heat energy
- molecular therory
- energy due to motion
- state of energy
18: 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
- 96
- 38
- 58
19: Ammonia belongs to Group
- B-1
- B-2
- A-1
- A-2
20: 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
21: If the power element on an expansion valve should lose its charge, the valve would
- Stay open
- Over feed
- Under feed
- Close
22: An accumulator can be located between the
- compressor and condenser
- evaporator and compressor
- condenser and evaporator
- first stage and second stage compressors
23: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
24: A High-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
25: The absorber shell contains the
- condenser, the evaporator, and the generator
- condenser and the absorber
- condenser and the generator
- evaporator and the absorber