Q. Under isothermal condition, a vertical tube of length L = 100 m contains a gas of molecular weight equal to 60. The pressure and temperature at the top of the tube are 100 kPa and 25 oC respectively. Consider the universal gas constant and acceleration due to gravity as 8.314 J mol-1 K-1 and […]
Q. Vapour bubbles are formed in the nucleate boiling regime at a frequency of 10 bubbles per second per nucleation site. There are 100 nucleation sites per m2 of heating area. The latent heat of vapourization and the density of vapour under the operating condition are 1000 kJ/kg and 1 kg/m3 respectively. The diameter of
Q. The wall of a pipe of radius 1 m is at a uniform temperature of 200 oC, and is covered by insulation of thickness 0.1 m. The ambient air outside the insulated pipe is at 20 oC and has heat transfer coefficient of 10 W m-2 K-1. The thermal conductivity of the insulation material
Q. An insulated storage tank contains 1000 kg liquid of specific heat 10 kJ kg-1 K-1. The liquid is heated by saturated steam, condensing in a helical coil at a temperature of 180 oC. The heat transfer area of the coil is 0.1 m2. If the overall heat transfer coefficient is constant at 1000 W
Q. In a laboratory batch setup, reaction of P over a catalyst was studied at various temperatures. The reactions occurring are P —> 2Q ; P —-> R At the end of one hour of operation, the batch contains xP, xQ and xR mole fractions of P, Q and R components, respectively. The mole fractions
Q. Match the items in Column A with the items in Column B Here, f denotes the phase shift, K1 and K2 the process gains, t the time constant, and AR the amplitude ratio. (A) P-II, Q-III, R-IV, S-I (B) P-III, Q-II, R-IV, S-I (C) P-I, Q-IV, R-II, S-III (D) P-IV, Q-I, R-II, S-III Ans: P-IV, Q-I,
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Q. A person is drowning in sea at location R and the lifeguard is standing at location P. The beach boundary is straight and horizontal, as shown in the figure. The lifeguard runs at a speed of VL and swims at a speed of VS. In order to reach to the drowning person in optimum
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Q. A furnace installed at a cost of Rs. 24 Lakh is expected to serve its useful life of 5 years. Salvage value of the furnace is Rs. 8 Lakh. The interest rate compounded annually is 8%. The estimated capitalized cost (in Lakhs of rupees) is (A) 30 (B) 34.09 (C) 34.9 (D) 58.09 Ans:
Q. In the year 2005, the cost of a shell and tube heat exchanger with 68 m2 heat transfer area was Rs. 12.6 Lakh. Chemical Engineering Index for cost in 2005 was 509.4 and now the index is 575.4. Based on index of 0.6 for capacity scaling, the present cost (in Lakhs of rupees) of
Q. Match the equipment in Column A with the corresponding process in Column B Column A Column B (P) Centrifugal sifter (I) Mixing (Q) Bowl mill (II) Sedimentation (R) Gravity thickener (III) Screening (S) Two-arm kneader (IV) Grinding (A) P-I, Q-IV, R-II, S-III (B) P-III, Q-IV, R-II, S-I (C) P-IV, Q-I, R-II, S-III (D) P-IV,
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