The oil in a vacuum pump should be changed _____
A) about every five minutes of pump operation
B) only when changing from one refrigerant to another
C) immediately after pumping down a wet or contaminated system
D) about every 25 hours of pump operation
Answer: C
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If using spring brakes when hauling a heavy load a complete stop will
a. Be impossible. b. Take a long time. c. Take a short amount of time.
A frictionless 400-mm-diameter piston sits on top of 2 kg of water in a cylinder such that the pressure is initially at 120 kPa at a temperature of 80ºC. Heat is added until the piston rises a distance of 2 m, at which state the quality of the steam is nearest:
A) 0.19 B) 0.14 C) 0.088 D) 0.034
____________________ is the force that resists motion between the surfaces of two objects or forms of matter.
Fill in the blank(s) with the appropriate word(s).
In the figure above, if there was an open at terminal "C", what would the voltage signal to the PCM be?
A. 0 volts B. About 1½ volts C. About 3½ volts D. 5 volts