What is considered a long-line application for residential air conditioning?
A) Lines exceeding 100 ft in length or with a vertical rise of more than 30 ft
B) Lines exceeding 50 ft in length or with a vertical rise of more than 10 ft
C) Lines exceeding 80 ft in length or with a vertical rise of more than 20 ft
D) Air-conditioning systems can run lines for nearly any length with no problems.
C
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TechnicianA says the best way to check a power tool is to plug it in and try to use it. TechnicianB says the power tool should be inspected before each use. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
The step response of an RLC circuit is given by  FIGURE 1.png)
Given that iL(0) = 3 A and vC(0) = 24 V, solve for vC(t) and IC(t).
What will be an ideal response?
The internal piston in the reversing valve is moved from one side to the other by:
A) A stepper motor. B) Pressure difference. C) A gear motor. D) Permanent magnets attached to the ends of the piston.
During an AC performance test, an R-134a air conditioning system has a measured center duct outlet temperature of 41 degrees F. The manifold gage set shows low side pressure between 21-35 psi. The high side pressure ranges from 175-210psi. Intermittantly, the duct outlet temperature will rise to 60 degrees F and the low side gage show a vacuum when this happens. Shop Temperature is 72 degrees F. What is most likely the cause?
a. The system contains moisture causing a restriction in the TXV b. The system contains air with the refrigerant c. The TXV is defective and allowing too much refrigerant to flow d. The system is operating normally