The ________ counter bit is only true when the up counter rung is true
A) CD B) UP C) CU D) DN
C
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Which of the following is an NEC Article 427 requirement for the installation of electrical heat-tracing cables on pipe and vessels in unclassified areas?
a. The external surfaces of any equipment that operates at temperatures above 100°F (38°C) must be physically guarded, isolated, or thermally protected. b. Branch circuits and overcurrent devices supplying the equipment must be sized at no less than 100 percent of the total heater load. c. The heating cable cannot be allowed to make direct contact with the pipe or vessel. d. The presence of electric heating equipment must be identified using permanent caution signs or markings at the specified intervals.
Cables routed through bored holes in framing members must maintain a distance from the nearest edge of not less than _____.
a. 1/4" (6 mm) b. 1/2" (13 mm) c. 1-1/4" (32 mm) d. 2" (50 mm)
The network in Figure16.4 has two dependent sources whose values depend on an external voltage and a(n)______________
A. internal voltage B. external current C. internal current D. current source
Ten 10 k? resistors are connected in series across a 24-V source. The total voltage across all the resistors is
A) 24 V B) 10 V C) 2.4 V D) 2.4 mV