Engineering, 20.11.2020 23:00 cicimarie2018
A resistor and a capacitor are connected in series across a 150 Vac supply. When
the frequency is 40 Hz the current is 5 A, and when the frequency is 50 Hz the
current is 6 A. Find the resistance and capacitance for the of the resistor and
capacitor respectively.
Answers: 3
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The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length
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Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero
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Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.
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A resistor and a capacitor are connected in series across a 150 Vac supply. When
the frequency is 4...
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