Vikram Sarabhai Space Centre Scientist/ Engineer Chemical Paper 2016
| 1 | In a manufacturing industry, break-even point occurs when
(a) The total annual sales equals the fixed costs (b) The total annual rate of production equals the assigned value (c) The total annual profit equals the expected value (d) The total annual product cost equals the total annual sales. |
| 2 | In a plug flow reactor, there is
(a) Perfect mixing in the axial direction (b) A parabolic velocity profile (c) Perfect mixing in the radial direction (d) A spread of residence times |
| 3 | What will be the % Na2O content of lye containing 73% Caustic Soda?
(a) 49% (b) 56.5% (c) 77.5% (d) 60% |
| 4 | It is desired to make 100 kg of a solution containin 40% salt by mixing solution ‘A’ containg 25% salt and solution ‘B’ containing 50% salt. The mass in Kg of solutiion ‘A’ required is
(a) 40 (b) 60 (c) 50 (d) 70 |
| 5 | Water is flowing under laminar conditions in a pipe of length L. If the diameter of the pipe is doubled, for a constant volumetric flow rate, the pressure drop across the pipe
(a) Decreases 2 times (b) Decreases 16 times (c) Increases 2 times (d) Increases 16 times |
| 6 | Viscosity of the gases
(a) Increases with temperature and pressure (b) Decreases with temperature (c) Decreases with pressure (d) None of the above |
| 7 | In a completely opaque medium, if 50% of the incident monochromatic radiatin is absorbed, then which of the following statements are CORRECT?
(P) 50% of the incident radiation is reflected (Q) 25% of the incident radiation is reflected (R) 25% of the incident radiation is transmitted (S) No incident radiation is transmitted (a) P and S only (b) Q and R only (c) P and Q only (d) R and S only |
| 8 | Air is to be heated by condensing steam. Two heat exchangers are available –
(i) a shell and tube heat exchanger, and (ii) a finned tube heat exchanger, Tube side (inner) heat transfer area is equal in both cases. The recommended arrangement is, (a) Finned tube heat exchanger with air inside and steam outside (b) Finned tube heat exchanger with air outside and steam inside (c) Shell and tube heat exchanger with air inside tubes and steam shell side. (d) Shell and tube heat exchanger with air on shell side and steam inside tubes. |
| 9 | Entrainer used in azeotropic distillation of binary mixture,
(a) Forms no azeotrope with the original substance (b) Forms a minimum-boiling azeotrope with one of the feed components (c) Should be of very high viscosity to provide high tray efficiencies (d) Should have very high latent heat of vapourisation |
| 10 | An ideal flash vaporization is carried out with a binary mixture at constant temperature and pressure. A process upset leads to an increase in the mole fraction of the heavy component in the feed. The flash vessel continues to operate at the previous temperature and pressure and still produces liquid and vapor. After steady state is re-established.
(a) The amount of vapour produced will increase (b) The amount of liquid produced will decrease (c) The new equilibrium compositions of the vapor and liquid products will be different (d) The new equilibrium compositiions of the vapor and liquid products will remain as they were before the upset occurred. |
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