Thermal Expansion: a Machinist Needs to Remove a Tight Fitting

question 69

Multiple Choice

Thermal expansion: A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and the block to the same high temperature and removes the pin easily. What statement relates the coefficient of thermal expansion of material A to that of material B?

• A) Material B has a greater coefficient of expansion than does material A.
• B) The situation is not possible because heating block B will shrink the hole in the material as the material expands with increasing temperature.
• C) Material B has the same coefficient of expansion as does material A.
• D) Material A has a greater coefficient of expansion than does material B.

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Definitions:

IRR

Internal Rate of Return, the discount rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero.

Mutually Exclusive

Situations or choices where the acceptance or selection of one necessarily excludes the other(s).

Value Foregone

The benefit given up by choosing one investment or action over another alternative; essentially the opportunity cost of a decision.

IRR

The Internal Rate of Return is a financial measure utilized to calculate the expected profit of prospective investments.