What kind of check valve would you find in the air conditioner in a 20-year-old-home?
A) A check valve that used a steel ball. B) A check valve that has a disk and a spring.
C) A check valve made of plastic. D) A check valve that is inside the metering device.
B
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Calculate the energy required to lift an elevator and its occupants with a mass of 1000 kg through a vertical distance of 5 m.
a. 5000 J b. 49000 J c. 25000 J d. 2500 J
The no-load output voltage of a complex linear circuit is measured as 600 mV. When a 220 ? load is connected, the load voltage is found to be 489 mV. What is the Thevenin resistance of the circuit?
A) 50 ? B) 75? C) 179 ? D) 102 ?
When troubleshooting a hard steering problem on a highway tractor that occurs only when towing a loaded trailer, which of the following should be checked out first?
A. trailer suspension B. fifth wheel lubrication C. tractor rear suspension D. tractor kingpin lubrication