Describe the operation of servo action.
What will be an ideal response?
Servo action uses the force from one operating member to increase the force applied to another operating member. In drum brake systems, each brake shoe receives equal force from the wheel cylinder to push the shoe out against the drum.
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When an externally supplied shielding gas is added to provide the needed protection of the molten weld pool, it is called ____________________.
Fill in the blank(s) with the appropriate word(s).
Where the framing rests on concrete or masonry foundation walls, the piece in contact with the foundation is called the ____.
A. sill plate B. sill sealer C. box sill D. floor joist
Technician A says gasoline containers should be completely filled with gasoline to eliminate air from the container. Technician B says gasoline containers should be stored in a non-ventilated area. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
Roofing felt, also referred to as tar paper, is made from sheets of ____ that are impregnated and coated with tar to provide a water-resistant coating for protecting roofs as well as exterior walls.
A. felt B. a combination of paper and felt C. paper D. either paper or felt