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Question 38 - The terminal velocity of a falling object, v is given by v = sqrt [ 4g (R - r) D / (3Cr) ] where sqrt is the square root of, g = 9.81, D = 0.000208, R = 1800, r = 994.6, m = 0.000893. The Reynold number, L is given by L = rD (v) / m. The C for various conditions are : C = 24 / L for L < 0.1; C = 24 (1 + 0.14 L^0.7) / L for 0.1 <= L <= 1000; C = 0.44 for 1000 < L <= 350000; C = 0.19 - 80000 / L for 350000 < L. Find the value of v for the situation above by trial and error, ^ is power, <= is less than or equal to.
1 2457Question 39 - Acetone and ethanol are separated using a distillation column with a partial condenser and partial reboiler. An equimolar, sub-cooled liquid feed enters at 100 kmol / hr and condenses 1 mole of vapor for every 6 moles of feed. The separation requires a distillate vapor that is 95 mol % acetone and bottoms liquid that is 5 mol % acetone. The reflux is returned from the condenser to the column as a saturated liquid and the operation is run at (L / V) = 1.4 * (L / V) min. Assume constant overflow conditions. (a) Feed operating line is y = [ q / (q - 1) ] x - z / (q - 1) where z = 0.5 for equimolar liquid mixture of 2 components, q = (L’ - L) / F where L’ = L + F + (F / 6) for condensation of 1 mole of vapor / 6 moles of feed. What is y = f(x)? (b) The rectifying operating line is y = (L / V) x + (D / V) (xd) where (L / V) min goes through the points A (0.95, 0.95) and B (0.53, 0.69), V = L + D. What is y = f(x)? Let xd = 0.95. (L / V) min is the slope of the 2 points A and B.
1 6186star connection for a 3 phase induction motor gives reduced starting current.but 1.732 times the rated current during run up period if the motor was designed to run on delta. Why can't we design the motors to run on star connection instead. It will remove the starting arrangement required making the construction an operation much simpler.
1 3399What is difference between unity power factor wattmeter and upper power factor wattmeter? In short circuit test of transformer the wattmeter used is unity power factor type or upper power factor type wattmeter?
2772
State the other types of Air Conditioners?
what are the various technique used for inter process communication?
What is meant by shell and tube heat exchanger?
Why can't we use antifrictional bearing in place of journal bearing in a 660mw plant
Why is double the amount of gas collected in one of the test tubes in electrolysis of water than th amount collected in the other? Name this gas?
Hi I.m Abishek Chandra Electronics and Communication Engineer fresher 2009. I have 2 job offers. 1. Configuration Engineer at First American Corporation 2.Testing Engineer at Mphsis I don't wat to go by the brand name. I.m thinking in terms of growth
What is the power capacity of nuclear power plant used in nuclear submarrine?
How to calculate earth wire load by formula
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How can we find out LT UG cable fault (size,from-4*25mm sqr to 4*300mm sqr)? How mani types UG cable faults?
why occ characteristics curve in not tracing back when we are bringing back the rhoestat?
why using transformer and thyristor switch in 3 phase apfc panel
What is the world's hardest metal?
Describe transfer machines?
At what speed an electric car can run with 2 HP motor of weighing 400 kg?
