Exam 21: Mechanical Troubleshooting
Exam 1: Matter, Energy, and Heat Basics27 Questions
Exam 2: The Refrigeration Process30 Questions
Exam 3: General Safety Practices30 Questions
Exam 4: Refrigerant Management26 Questions
Exam 5: Hand Tools26 Questions
Exam 6: Tubing and Piping Tools28 Questions
Exam 7: Specialized Hvacr Tools43 Questions
Exam 8: System Location16 Questions
Exam 9: Air-Distribution Systems25 Questions
Exam 10: System Connections28 Questions
Exam 11: Leak Testing25 Questions
Exam 12: System Evacuation26 Questions
Exam 13: System Startup and Charging21 Questions
Exam 14: Electricity Fundamentals27 Questions
Exam 15: Electric Motors and Starting Components30 Questions
Exam 16: Electronic Controls26 Questions
Exam 17: Wiring Diagrams14 Questions
Exam 18: Electric Codes34 Questions
Exam 19: Testing, Adjusting and Balancing26 Questions
Exam 20: Indoor Air Quality30 Questions
Exam 21: Mechanical Troubleshooting26 Questions
Exam 22: Electrical Troubleshooting26 Questions
Exam 23: Electric Heat26 Questions
Exam 24: Gas Heat31 Questions
Exam 25: Oil Heat29 Questions
Exam 26: Hydronic Heat29 Questions
Exam 27: Heat Pumps25 Questions
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Which of the following could be the reason that the subcooling would be low on an air conditioning system?
Free
(Multiple Choice)
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Correct Answer:
A
Where is the high-side access port located on most residential central air conditioning systems?
Free
(Multiple Choice)
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Correct Answer:
B
Which of the following is NOT a condition of the belt being too tight on a blower?
Free
(Multiple Choice)
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Correct Answer:
B
Residential air conditioning systems have a superheat range of __________ degrees under normal operating conditions.
(Multiple Choice)
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List three key indicators that pulleys are not aligned properly on blowers.
(Essay)
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Which type of leak detection uses a refrigerant additive charged into the refrigeration system?
(Multiple Choice)
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If, while troubleshooting an R-22 residential air conditioning system at near design conditions, the operating pressures are found to be 80 psig on the low side and 200 psig on the high side, it is most likely that the system is opperating
(Multiple Choice)
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If, while troubleshooting a residential central air conditioning system, the technician notices frost on the suction line, what is the most likely problem?
(Multiple Choice)
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Which is NOT a cause of high superheat in an air conditioning system?
(Multiple Choice)
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Which is NOT a cause for low superheat in an air conditioning system?
(Multiple Choice)
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Which of the following could be the cause for excessive subcooling in an air conditioning system?
(Multiple Choice)
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To use the electronic leak detector, the system must contain at least some refrigerant. If the system is operating with a small leak, plenty of pressurized refrigerant is left in the system. But if the system is void of refrigerant, it must first be pressurized with __________, to which a trace of refrigerant has been added.
(Multiple Choice)
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List three common ways by which air can find its way into an air conditioning system.
(Essay)
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Halide leak detectors will work only with __________ refrigerants.
(Short Answer)
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Newer, high efficiency air conditioning systems operate with __________ condenser saturation temperatures and pressures than older, standard efficiency systems.
(Multiple Choice)
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Which of the following is a condition of an air conditioning system that is overcharged?
(Multiple Choice)
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Arrange the following troubleshooting steps in the correct order.
_____ test the system operation
_____ gather information
_____ verify the complaint
_____ complete the service call
_____ perform a visual inspection
_____ isolate the problem
_____ correct the problem
(Essay)
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