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When a cloud passes over a certain spot on the surface of the earth a vertical electric field of E = 100 V/m is recorded there. The bottom of the cloud is a height d = 300m above the earth and the top of the cloud is 600m above the ground. Assume that the cloud is electrically neutral but as a +q at its top and -q at its bottom. Estimate the magnitude of the charge q and the external electric force (direction and magnitude) on the cloud.
Air is to be compressed from atmospheric pressure at 60oF to 100 psia in a centrfugal compressor (isentropic efficiency about 0.7). The flow rate will be 500 lbm/min. Specify the horsepower required for the driving motor
A dc shunt motor of 50 hp, 250 V is connected to a 230 V supply and is drawing an armature current of 200 A, and is running at speed of 1200 rpm. Its armature resistance is Ra = 0.2 ohms.
Efficiency in a power transformer is 98.6 percent when loaded such that its core losses equal the copper losses. Calculate the per unit resistance of this transformer.
An MFSK modulation scheme with M = 4has a carrier frequency of 250 kHz, a difference frequency of 25 kHz, and two bits per signal element. Make a frequency assignment for each of the possible data combinations.
When working out the power dissipated you have the equationusing the same current (io) but this time you use anegative sign in the equation. How do you know when to use a positive or negative sign for this current in both situations
A 5stage single pipeline computer uses the pipeline mentioned in the lecture (not the book). It resolves the direction and target of a conditional branch instruction at the end of its third pipeline stage.
A 60-Hz, 765-KV three-phase overhead transmission line has four ACSR 900 kcmil 54/3 conductors per phase. Determine the 60-Hz resistance of this line in ohms per kilometer per phase at 50 degrees Celsius.
Design a single state amplifier that satisfies the following specifications. State the transistor used and show all equations. 1. The voltage gain is greater than or equal to 0.9 and less than or equal to 1.0 2. The source resistance is 10k ohms
Is the second law satisfied? Will this refrigerator still satisfy the second law if its coefficient of performance is 6?
Find the heat energy generated by this amplifier. Assuming the BJT power transistor has a maximum junction temperature of 155 0C, if the ambient temperature is 25 0C, find the maximum allowable thermal resistance from the junction to ambient.
How much we need to pay for the electricity cost in 61 days when a water-desalination machine runs normally from 8AM to 4PM every day. (It draws 25A in its warming-up time (15 minutes) and draws, on average, 7A in its normal working time at 240V).
A current source of 12 cos 2000t A, a 200-ohm resistor, and a 0.2-H inductor are in parallel. Assume steady-state conditions exist. At t = 1 ms, find the power being absorbed by the (a) resistor; (b) inductor; (c) sinusoidal source.
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