In a four stroke cycle diesel engine, when is fuel injected into the cylinder?
A. At the end of the compression stroke and the beginning of the power stroke.
B. During the compression and exhaust strokes .
C. Only when the piston is at TDC in the compression stroke.
D. Only during the power stroke.
Answer: A
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For some years, the City of Armstrong Power Authority has used 4-20 mA technology to measure parameters such as pressure, temperature, flow rates, and speed of various machinery and systems installed in its generation facilities. It now plans to use the same technology to measure vibration on all of its rotating machinery with the goal of evaluating continuously the health of the equipment, to include friction buildup, breakdown prediction, and preventive maintenance needs. Depending upon the vendors chosen, the useful lives and anticipated annual net savings will vary, as reflected in the estimates shown.
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Use repeated spreadsheet solutions of the capital budgeting problem with investment limits ranging from $0.5 million to $2.5 million (in $0.25 million increments, i.e., $250 increments since all estimated values are in $1000 units) to determine the best selections. Once done, develop a graph that plots the investment limit versus the value of Z. Use MARR = 5% per year.
The lifetime of a certain component, in years, has probability density function
Two such components, whose lifetimes are independent, are available. As soon as the first component fails, it is replaced with the second component. Let X denote the lifetime of the first component, and let Y denote the lifetime of the second component.
a. Find the joint probability density function of X and Y.
b. Find P(X < 1 and Y > 1).
c. Find 
.
d. Find 
.
e. Find P(X+Y ? 2).
Referring to the following figure, a work order indicates no A/C cooling. The blower motor is found to operate correctly. Which of the following could be the cause?
A. Blown fuse F12 B. Low A/C refrigerant level (low pressure in system) C. Open circuit A77-GB D. Both B and C
What does cutability mean?
What will be an ideal response?