Technician A says that polyolefin plastics are all thermoset plastics. Technician B says that polyolefin plastics are all thermoplastic plastics. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technicians A and B
D. Neither Technician A nor B
B. Technician B only
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Which of the following definitions best describes sleeve (fluid film) bearings?
a. They are used in moderate-pressure applications in small to mid-size operations (less than 1,000 rpm). b. They are used in smaller machinery at low speeds. c. They are used in larger machinery at low speeds. d. They are used in larger machinery at high speeds.
What characteristic of a grass is determined by the width of the grass leaf?
a. texture c. length b. size d. thickness
When brazing on a refrigeration line with an attached service valve:
A) The valve should be cut out of the system prior to brazing to avoid overheating. B) The joint should be heated quickly to avoid overheating the valve. C) The line should be attached with quick-setting cement instead of brazed. D) The joint should be heated slowly to prevent overheating the valve.
The face reinforcement of a V-groove weld with backing using 1/4" aluminum plate should not exceed
_____. a. 1/16" (1.6 mm) b. 3/32" (2.4 mm) c. 1/8" (3.2 mm) d. 1/4" (6.4 mm)