TNPSC Engineering Services Previous Year Question Paper 2008 on Mechanical Engineering
| TNPSC – Combined – Engg.Ser – 2008 – Mechanical – Production-Engg. | |
| Sr. No. | Questions with multiple options |
| 1. | If the sum of all the forces acting on a body is zero, it may be concluded that the body
(a) Must be in equilibrium (b) Cannot be in equilibrium (c) May be in equilibrium provided the forces are concurrent (d) May be in equilibrium provided the forces are parallel. |
| 2. | A higher compression ratio causes
(a) An acceleration in the rate of combustion (b) Tendency of an engine to increase detonation (c) Pre-ignition (d) All of these |
| 3. | A screw jack used for lifting the load is
(a) A reversible (b) A non-reversible machine (c) An ideal machine (d) None of these |
| 4. | In ideal machines
(a) Mechanical advantage is greater than velocity ratio (b) Mechanical advantage is equal to velocity ratio (c) Mechanical advantage is less than velocity ratio (d) Mechanical advantage is unity |
| 5. | For a self-locking lifting machine, the efficiency must be
(a) 50% (b) More than 50% (c) Less than 50% (d) 100% |
| 6. | Pick out the correct statement:
(a) The path traced by a projectile is trajectory (b) The area under v-t diagram is acceleration (c) Efficiency of simple machine is velocity ratio / mechanical advantage. (d) If efficiency is < 50%, that simple machine is reversible |
| 7. | A couple produces
(a) Translator motion (b) Rotational motion (c) Combined translator and rational motions (d) None of these |
| 8. | State friction is always
(a) Less than dynamic friction (b) Equal to dynamic friction (c) Greater than dynamic friction (d) Has no relation with dynamic friction |
| 9. | The thermal efficiency of petrol engines is about
(a) 15% (b) 30% (c) 50% (d) 70% |
| 10. | In the macroscopic approach. In the study of thermodynamics
I. The structure of matter is taken into account II. The structure of matter is not considered III. Only a limited number of properties are used to describe the state of matter IV. The values of the properties needed for the description of the system cannot be measured. Of the statements: (a) I alone is correct (b) I and II are correct (c) II and III are correct (d) All are correct |
| 11. | Temperature of a gas is due to
(a) Its heating value (b) Kinetic energy of molecules (c) Repulsion of molecules (d) Attraction of molecules |
| 12. | When a perfect gas is expanded through an aperture of minute dimensions, the process is
(a) Isothermal (b) Adiabatic (c) Isentropic (d) Throttling |
| 13. | Carnot engine is irreversible due to
(a) Friction between moving parts (b) Losses from working fluid in transit (c) High speed (d) Both (a) and (b) |
| 14. | During adiabatic expansion
(a) Internal energy remains constant (b) Temperature remains constant (c) Entropy remains constant (d) Enthalpy remains constant |
| 15. | Heat flows from hot substance to cold substance unaided. This statement is given by
(a) Kelvin (b) Gay-Lussac (c) Joule (d) Clausius |
| 16. | The coefficient of performance of a Carnot refrigerator operating between the reservoirs at -10°C and 40°C is
(a) 0.526 (b) 5.26 (c) 52.6 (d) 526 |
| 17. | Which of the following is the extensive property of a theromodynamic system?
(a) Pressure (b) Volume (c) Temperature (d) Density |
| 18. | The function of a distributor in a coil ignition system of I.C. engines is
(a) To distribute spark (b) To distribute power (c) To distribute current (d) To time the spark |
| Published on 11th Oct 2021 | |
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