In the heating mode, a leaking check valve on the indoor coil will show up as _____
a. a noisy compressor
b. a chattering check valve
c. normal operation
d. low head pressure
c
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A monatomic ideal gas is initially confined in a 0.1 m3 chamber at T = 300 K and P = 0.1 MPa. A second chamber, which has a volume of 0.05 m3, is connected to the first by a valve, and is initially evacuated. The valve is opened and gas flows from the first chamber into the second until the two chambers are in equilibrium. Both chambers and the valve are adiabatic. How much entropy is generated by this process?
A. 3.37 J/mol•K B. 6.74 J/K C. 13.5 J/K D. 12.7 kJ E. Insufficient information to solve
The power generated by photovoltaic cells in an array ________________
A. is alternating current and can be directly used by the power company B. is direct current power C. can be increased by having the array track the movement of the sun D. both B and C
AND, OR, and NOT gates provide the three primary logic functions
Indicate whether the statement is true or false
Which of these statements about staying alert to drive is true?
a. Sleep is the only thing that can overcome fatigue. b. If you must stop to take a nap, it should be at a truck stop or other rest area-never on the side of the road. c. There are drugs that can overcome being tired. d. A half-hour break for coffee will do more to keep you alert than a half-hour nap.