TNPSC Engineering Services Previous Year Question Paper 2008 on Chemical Technology
| TNPSC – Combined – Engg.Ser – 2008 – Chemical – Technology | |
| Sr. No. | Questions with multiple options |
| 1. | If the Prandtl number is greater than the Schmidt number.
(a) The thermal boundary layer lies inside the concentration boundary layer (b) The concentration boundary layer lies inside the thermal boundary layer (c) The thermal and concentration boundary layer are of equal thickness (d) The hydrodynamic (momentum) boundary layer is thicker than the other two. |
| 2. | The second law of thermodynamics states that
(a) The energy change of a system undergoing any reversible process is zero (b) It is not possible to transfer heat from a lower temperature to a higher temperature (c) The total energy of the system and surroundings remains constant (d) None of these |
| 3. | Which one of the following is true?
(a) G = H – TS (b) G = H + TS (c) G = H + T/S (d) None of these |
| 4. | In a mixture of ideal gases, the fugacity of component is equal to the
(a) Pressure of gas mixture (b) Partial pressure of component I in the gas mixture (c) Zero (d) None of these |
| 5. | A Carnot cycle consists which of the following steps?
(a) Two isothermals and two isentropic (b) Two isobaric and two isothermals (c) Two isochoric and two isobaric (d) Two isothermals and two isochoric |
| 6. | Which of the following is derived to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions?
(a) The amount of work needed is path dependent (b) Work alone cannot bring about such a change of state (c) The amount of work needed is independent of path (d) More information is needed to conclude anything about the path dependence or otherwise of the work needed |
| 7. | Pressure is an example for
(a) Intensive property (b) Extensive property (c) Both intensive and extensive properties (d) None of these |
| 8. | Air initially at 101.3k Pa and 40°C and with a relative humidity of 50% is cooled at constant pressure to 30°C. The cooled air has
(a) A higher dew point (b) A higher absolute specific humidity (c) A higher relative humidity (d) A higher wet bulb temperature |
| 9. | The molar composition of a gas is 10% , 10% , 30% and balance O. If 50% O condenses, the final mole per cent of in the gas on a dry basis will be
(a) 10% (b) 5% (c) 18.18% (d) 20% |
| 10. | At triple point of water system, the system is
(a) Invariant (b) Univariant (c) Bivariant (d) Trivariant |
| 11. | Stochiometric quantity of air is the quantity of air required for complete combustion of fuel with
(a) Some excess oxygen (b) No oxygen left unused (c) 50% excess air (d) 100% excess air |
| 12. | A binary system consisting of two substances which are miscible in all proportion in the liquid phase, but do not react chemically is known as
(a) Univariant system (b) Eutectic system (c) Metastable system (d) Congruent melting system |
| 13. | The value of universal gas constant is
(a) 8.3144 kJ / mole K (b) 1.983 cla / g mole K (c) 10983 Btu / lb mole K (d) All of these |
| 14. | Heat pump is a device operating by taking up
(a) Heat at high temperature and discharges at low temperature (b) Heat at high temperature and discharges at same temperature (c) Heat at low temperature and discharges at high temperature (d) None of these |
| 15. | Gibbs phase rule finds application when heat transfer occurs by
(a) Conduction (b) Convection (c) Radiation (d) Condensation |
| 16. | Molecular diffusivity of a liquid
(a) Increases with temperature (b) Decreases with temperature (c) May increase or decrease with temperature (d) Is independent of temperature |
| 17. | Bomb calorimeter is used for determining the calorific value of
(a) Solid fuel (b) Liquid fuel (c) Gaseous fuel (d) Both (a) and (b) |
| 18. | In the friction factor chart the slope of the line for the laminar flow region is
(a) + 1 (b) – 1 (c) 0 (d) None of these |
| Published on 13th Oct 2021 | |
Leave a Reply