Spot detectors containing a light source and a photosensitive device on which light rays do not normally fall operate on the _____.
a. ionization principle
b. light-scattering principle
c. light-obscuration principle
d. smoke-rate compensation principle
b. light-scattering principle
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Follow the steps of the Systematic Approach of Section 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, (3) construct a schematic diagram with inputs and outputs, (4) Label known material quantities or rates of flow and so on.
A slurry (mix of water and insoluble material) of crushed mine coal is fed to a cyclone separator at a rate of 8.0 t/h. The mine coal averages 78 percent pure coal and 22 percent pyrite. Pure coal is recovered at the top of the separator. The waste from the bottom of the separator contains 3.0 percent pure coal and 35 percent pyrite; the rest is water. How much pure coal can be obtained in a 12 h time period?
Which of the following is true of GMA spot welding?
A. Welds can only be made in thin materials. B. The weld cannot be made if only one side of the materials to be welded is accessible. C. The weld cannot be made when there is paint on the interfacing surfaces. D. The burning back of the thin material allows the thicker metal to be melted.
In an aircraft, for what reason would an initiator be used?
What will be an ideal response?
What do the jumper cables and side switch pins on a breakout box allow?
a. Measurement of individual interface signals. b. Interruption of voltage/current to the interfaces. c. Cross-patching of individual interface conductors. d. Changing the voltage of individual interface signals.