To prevent contamination of the weld puddle, shielding gases are used to displace what from the weld zone?
a. Dross
b. Argon
c. Atmosphere
d. Carbon deposits
c
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The defrost timer contacts are operated by a(n) ____ that is gear-driven by an electric wall clock motor.
a. lever b. shaft c. eccentric disc d. cam
Cost per mmBtu of steam from a district heating plant is characterized by which of the following?
A) More than the cost of steam produced on site due to capital investment for the plant. B) Less than the cost of steam produced on site due to higher efficiency. C) Approximately equal to the cost of stream produced on site since fuel costs are equal.
Which of the following is NOT a characteristic of satisfactory engine oil?
A) Provide dry friction between moving parts B) Resist foaming C) Pours at low temperatures D) Proper viscosity
A _______ oil pump is used in the majority of four-stroke motorcycle engines.
A. gear B. plunger C. centrifugal D. trochoid