Select the process that is most nearly reversible in today's processes:

A) Expanding gas in a cylinder
B) Transferring heat in a heat exchanger
C) Combustion in a cylinder while the piston is stationary
D) Electrical resistance heating in a cylinder while the piston is free to expand


A) Expanding gas in a cylinder
Only (A) can possibly be reversible. The other three are irreversible.

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The National Electrical Code is revised every ____________________ unless a TIA is submitted.

Fill in the blank(s) with the appropriate word(s).

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Two technicians are discussing how to loosen bleeder valves. Technician A says that a shock is usually necessary to break the taper at the base of the valve. Technician B says to apply steady, loosening torque to the bleeder valve using a 6-point wrench. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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The Boolean expression for the XOR is ________

Fill in the blank(s) with correct word

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Numerical control is a method of controlling a machine tool using ____.

A. coded computer language B. variable speeds C. keyboard input D. voice commands E. none of the above

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