Engineering, 25.09.2020 03:01 khanhlan7213
In unguided medium (free space), the electromagnetic (EM) signal wave spreads as it leaves the transmit antenna. Since the power of the EM signal resides at the surface area of the wave front, signal power is described as signal power density (i. e., watts per area). As the signal propagates away from the transmitter, power density decreases, and attenuation is experienced.
a) true
b) false
Answers: 1
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Fluids at rest possess no flow energy. a)- true b)- false
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Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
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Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented
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Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false
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In unguided medium (free space), the electromagnetic (EM) signal wave spreads as it leaves the trans...
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