__________ provides information regarding proper grounding of tools and equipment.
A. Article 110
B. Article 210
C. Article 240
D. Article 250
Answer: D
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What is the difference between mass-average velocity and mole-average velocity during mass transfer in a moving medium? If one of these velocities is zero, will the other also necessarily be zero? Under what conditions will these two velocities be the same for a binary mixture?
What will be an ideal response?
Use mesh analysis to obtain ia, ib, and ic in the circuit shown in Fig. 3.84.
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If two inductors are connected in a series AC circuit, which inductor drops more voltage?
A) the smaller inductance B) the larger inductance C) It depends upon the source voltage. D) It depends upon the frequency.
A laser operates on the fundamental principle that a pumped medium amplifies a travelling light beam as it propagates through the medium. Without mirrors a laser becomes a single-pass travelling wave amplifier (Figure E.26.1).
This is a system without feedback. If we now place mirrors at each end of the pumped medium, we introduce feedback into the system.
When the gain of the medium becomes large enough the system oscillates creating a coherent output light beam. That is laser operation. If the gain of the medium is less that that required to sustain oscillation, the system is known as a regenerative travelling-wave amplifier (RTWA).
Let the electric field of a light beam incident on the RTWA from the left be the excitation of the system, Einc(s), and let the electric fields of the reflected light, Erefl (s), and the transmitted light,
Etrans (s), be the responses of the system (Figure E.26.3).
