____________________ ensure that a grid-connected system can be isolated from the grid when necessary to prevent it from feeding power into the grid when people are working on the grid transmission and distribution systems.
Fill in the blank(s) with the appropriate word(s).
Safety disconnects
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A support pole makes an angle of 40°? with the? main vertical pole. The angle the support pole makes with the horizontal ground is:
A. ?40°? B. ?50°? C. ?140°? D. ?180°?
__________ is not a valve adjustment system.
A. Screw and lock nut B. Shim under bucket C. Shim over bucket D. Lever and pulpit
Which of the following is a basic role of packaging in distribution?
I. Identify the product. II. Contain and protect the product. III. Contribute to physical distribution efficiency. IV. Be an important part of the marketing program. A) I, II, III and IV B) I, II and IV only C) II, III and IV only D) I, II and III only E) none of the above
A motor with four stator poles will rotate at __________ a two-pole motor when the applied frequency is 60 Hz.
A. half the speed of B. twice the speed of C. the same speed as