Techniques to be used to weld tool steel include:
A) Preheat weld area B) Peen each pass
C) Keep heat input low D) All of the above
D
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One mole of air, initially at 150°C and 8 bar, undergoes the following mechanically reversible changes. It expands isothermally to a pressure such that when it is cooled at constant volume to 50°C its final pressure is 3 bar. Assuming air is an ideal gas for which 
and 
calculate W, Q, ?U, and ?H.
What will be an ideal response?
The system condition that can cause the vapor returning to the compressor to be superheated beyond normal is a(n) _____.
a. dirty evaporator coil b. evaporator coil installed above the compressor c. loose indoor-blower drive belt d. uninsulated suction line
Western saddles were originally designed for cowboys who worked cattle
Indicate whether the statement is true or false.
Draw the symbols for a blower and a reciprocating compressor.
