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The following data was obtained for the adsorption of nitrogen on alumina at 77 K. The vapor pressure of N2 at 77 K is 1 atm. Estimate the surface area (m2/g) by BET method assuming the area occupied by one N2 molecule to be 16.2 x10-20 m2. (6) Pressure, mm Hg 8 30 50 102 130 148 233 258 330 442 480 Volume adsorbed, cm at STP 103 3 116 130 148 159 163 188 198 221 270 294
A balloon is rising vertically upward with a uniform velocity 'u' as shown At a certain instant, a ball No. 1 is dropped trom it, which takes a 4 seconds to reach the ground. The moment this ball strikes the ground, another ball is dropped from the balloon and this 2nd ball takes 5 seconds to reach the ground. Find the velocity of the balloon 'u' and height from which both the balls must have been dropped.
A continuous cable (diameter 6 mm) with tension force T is attached to a horizontal frame member at B and C to support a sign structure, Fig. 1. The cable passes over a small pulley at D. The wire is made of a copper alloy, and the stress-strain relationship for the wire is (a) Find the axial normal strain in the cable and its elongation due to the load W = 6.8 kN (b) If the forces are removed, what is the permanent set of the cable. Hint: Start with constructing the stress-strain diagram and determine the modulus of elasticity, E and the 0.2% offset yield stress
A continuous cable (diameter 6 mm) with tension force T is attached to a horizontal frame member at B and C to support a sign structure, Fig. 1. The cable passes over a small pulley at D. The wire is made of a copper alloy, and the stress-strain relationship for the wire is (a) Find the axial normal strain in the cable and its elongation due to the load W = 6.8 kN (b) If the forces are removed, what is the permanent set of the cable. Hint: Start with constructing the stress-strain diagram and determine the modulus of elasticity, E and the 0.2% offset yield stress.
what is the circuit open noise voltage across a 100-k resistor over the frequency range of direct current to 20 kHz at room temperature (25°C)?
goods truck arrive randomly at a stockyard with a mean of 8 trucks/hour.a crew of four operatives can unload a truck in 6 minutes. trucks waiting in queue to be unloaded are paid a waiting charge at the rate of 60/hour, operative are paid a wage rate of 20/hour.it is possible to augment the crew strength to 2 or 3 (of four operatives per crew) when the unloading time will be 4 minutes or 3 minutes respectively per truck.find the optimal crew
In a Diesel engine inlet pressure and temperature are 1 bar and 17 oC respectively. Pressure at the end of adiabatic compression is 35 bar. The ratio of expansion i.e. after constant pressure heat addition is 5. Calculate the heat addition, heat rejection and the efficiency of the cycle. Assume Cv = 0.717 kJ/ kg K, 𝛾=1.4
Deduce an expression for Air-standard efficiency of Otto cycle. A diesel engine has a
compression ratio of 22 and cut-off take place at 7% of the stroke. Find the efficiency
A mixture of benzene and toluene containing 40 mole % of benzene is to be separated to give a product of 90 mole % benzene at top and a bottom product with not more than 10mole % benzene. Using an average value of 2.4 for relative volatility of benzene relative to toluene, calculate the number of theoretical plates required at total reflux. Also calculate the minimum reflux ratio, if the feed is liquid and is at its boiling point
Consider a system having a frequency response H(f) as shown in the figure. Find the output signal y(t) and normalized average power of the output if the input signal to system is x(t) = 2 + 4cos(2πt) + 4cos(4πt).
Figure :- https://pasteboard.co/Zpsg6UvZIXnI.png
#331389 on Nov 2022