What does the acronym Btu stand for when referring to heat transfer?
What will be an ideal response?
British thermal unit
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What is considered to be the first heat engine?
A. reciprocating steam engine B. rocket engine C. water turbine D. reaction turbine
An R404 freezer has a suction pressure of 16 psig and a suction line temperature of -15°. What is the superheat?
a. 5° b. 10° c. 15 ° d. 20°
The diameter of an imaginary circle on which gear teeth are designed is the diametral pitch.
Answer the following statement true (T) or false (F)
Which of the following is not true regarding flatness?
A. It differs from straightness. B. The term flatness is interchangeable with the term straightness. C. When flatness is the feature control, a datum reference is neither required nor proper. D. Flatness is specified when size tolerances alone are not sufficient to control the form and quality of the surface.