A triac can be described as:
A) Three silicon-controlled rectifiers (SCR) in series.
B) Two silicon-controlled rectifiers (SCR) in parallel.
C) Two silicon-controlled rectifiers (SCR) in series.
D) Three silicon-controlled rectifiers (SCR) in parallel.
B
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Weed control for grapes is done best through which type of cultivation?
A) By hand B) Grape hoeing C) Chemical weed control D) All of the above
Transpose paths 1, 2 and 3 of Fig. 18.39 to Fig. 18.38, and determine the microstructures corresponding to these paths in the hypereutectoid steel.
What will be an ideal response?
?What is used to remove the material from a hole being drilled with a laser?
A. ?A jet of clean dry compressed air blasts the molten metal out of the hole. B. ?Laser drilling is always done overhead so the molten metal will run out of the hole. C. ?The intense heat vaporizes the spot with enough force to thrust the material out. D. ?The laser is hot enough so that it passes through the molten metal until the hole is completed and then the molten metal drips out.
Of the following copper tubing types, the one with the thinnest wall is _____
a. Type K b. Type L c. Type M d. Type ACR