What is a transient voltage?
A) A voltage that is traveling from one part of the circuit to another part of the circuit
B) A momentary surge or spike of voltage that can be several times the normal circuit voltage
C) A voltage that affects only the moving, or transient portions of the circuit
D) A voltage that temporarily transforms to current or resistance
B
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Grade horses are usually more expensive to purchase than a registered horse.
Answer the following statement true (T) or false (F)
A traffic accident causes traffic to come to a halt in an underwater tunnel. The people in their vehicles allow their engines to idle. There are 100 vehicles stopped in the tunnel; assume their vehicle engines emit on average 0.269 g/min of VOC (aldehyde), 3.82 g/min CO, and 0.079 g/min NOx. The tunnel is long and narrow with a height of 10 m, a width of 25 m, and a length of 0.5 km. Assume the ambient air concentrations of CO, VOCs, and NOx are small. The mean air velocity through the tunnel, when traffic stops, is limited to 0.2 m/s.
a. Assuming traffic remains halted long enough for the concentration carbon monoxide, nitric oxides, and hydrocarbons in the canyon to reach steady state, what would the expected concentrations of carbon monoxide, nitric oxides and hydrocarbons be in ppmv in the tunnel? b. Do the CO and NOx concentrations exceed NAAQS? c. Does the CO concentration exceed the OSHA’s permissible exposure limit (PEL)? What will be an ideal response?
__________ is the mass of water vapor present in a particular volume of atmosphere.
A. Absolute humidity B. Relative humidity C. Dew point
The recommended method for applying the first layer of a built-up roof to prevent seepage of tar into the
rafter spaces is to _____. a. apply a layer of tar and allow it to dry before applying the first layer of felt b. apply a dry layer of felt, followed by the first layer of tar c. apply a layer of tar, followed by insulating boards that will absorb any excess tar d. place a flexible membrane over the decking, followed by the first layer of felt and asphalt