Los megáhmetros de los sistemas de la clase 600V suelen aplicar un voltaje de:
a. 150 a 300V.
b. 50 a 150V.
c. 500 a 1.000V.
d. 300 a 500V.
c. 500 a 1.000V.
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In general, a flow switch contains ____ electrical contacts.
a. either normally open or normally closed b. only normally open c. both normally open and normally closed d. only normally closed
The prefix ____________________ indicates a filler metal that is supplied for use as either a current-carrying electrode or in rod forms.
Fill in the blank(s) with the appropriate word(s).
Each phase load consists of a 20-ohm resistor and a 10-ohm inductive reactance. With a line voltage of 480 V rms, calculate the average power taken by the load if:
(a) the three phase loads are delta-connected, (b) the loads are wye-connected.
Which of the following is not a part of the Profibus protocol family?
A. Profibus Decentralized Periphery B. Profibus PA C. Profibus FMS D. None of these are correct