In an extension line, a(n) ____ arrowhead is preferred.
A. closed
B. open
C. thick
D. thin
Answer: A
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One of the methods of electrical interlocking is accomplished with the use of double-acting push buttons.
Answer the following statement true (T) or false (F)
The ease with which the voltage can be raised and lowered makes DC ideal for transmission purposes.
Answer the following statement true (T) or false (F)
From a fixed point on the ground, the distance to a certain tree is measured to be s = 55.2 ± 0.1 m and the angle from the point to the top of the tree is measured to be ? = 0.50 ± 0.02 radians. The height of the tree is given by h = s tan ?.
a. Estimate h, and find the uncertainty in the estimate. b. Which would provide a greater reduction in the uncertainty in h: reducing the uncertainty in s to 0.05 m or reducing the uncertainty in ? to 0.01 radians
Three different design screw compressors are:
A) Micro screw for small appliances, standard screw for 2 -5 ton applications, and the mega screw for industrial applications. B) Open screw, semi-hermetic screw, welded hermetic screw. C) Single screw, compound screw, and the compound-complex screw. D) Single screw with gate rotors, dual screw, and triple screw.