Los cables de un sensor a un relé de pérdida a tierra NO debe ser más extensos que:
a. 10' (3,04 m)
b. 25' (7,62 m)
c. 50' (15,24 m)
d. 100' (30,48m)
b. 25' (7,62 m)
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Which of the following is a personnel safety hazard associated with reactors? (Select all that apply.)
a. Burns b. Skin contact with acid c. Inhalation hazard d. Fire hazard
The armature of a large DC motor has a very low resistance, typically less than ____.
a. one ohm b. two ohms c. three ohms d. four ohms
(a) As explained in Sec. 10.10, a ternary alloy may have a ternary eutectic point, at which four phases may coexist. Describe the nature of these four phases. How many degrees of freedom are there when the four phases coexist in a ternary alloy? What is the meaning of this?
(b) A ternary alloy may also have a three?phase field. How many degrees of freedom will there be in the three?phase field? Explain the significance of this number of degrees of freedom. (c) In a ternary alloy a single?phase field may also occur. How many degrees of freedom will it contain?
A circuit consists of a transformer with a secondary voltage of 20 Vac connected to a silicon diode in series with a 1 k? load resistor (RL). The peak voltage across the load is
A) 19.3 V B) 0.7 V C) 28.3 V D) 27.6 V