| 1. |
Which of the following cycle is less efficient as compared to the remaining? |
| A. | Carnot cycle |
| B. | All have identical efficiency |
| C. | Stirling cycle |
| D. | Ericsson cycle |
| E. | Otto cycle |
| Answer» E. Otto cycle | |
| 2. |
The number of degrees of freedom in case of triatomic gases is |
| A. | 5 |
| B. | 3 |
| C. | 6 |
| D. | 4 |
| E. | 2 |
| Answer» C. 6 | |
| 3. |
At critical point the enthalpy of vaporisation is |
| A. | Only dependent on temperature |
| B. | Zero |
| C. | Maximum |
| D. | Minimum |
| E. | None of the above |
| Answer» B. Zero | |
| 4. |
In which of the following case the process of sublimation can occur? |
| A. | Solid nitrogen |
| B. | Solid carbondioxide |
| C. | Liquid air |
| D. | Solid oxygen |
| E. | Sodium |
| Answer» B. Solid carbondioxide | |
| 5. |
Work done in a free expansion process is |
| A. | Negative |
| B. | Positive |
| C. | Maximum |
| D. | Zero |
| E. | Minimum |
| Answer» D. Zero | |
| 6. |
If a system neither exchange mass nor energy with the surroundings, it is known as |
| A. | Semi-closed system |
| B. | Isolated system |
| C. | Inactive system |
| D. | Closed system |
| E. | Segregated system |
| Answer» B. Isolated system | |
| 7. |
Food can be cooked quicker in a pressure cooker because |
| A. | Less heat is lost |
| B. | High pressure steam has high temperature |
| C. | Steam remains within the cooker |
| D. | It is made of a metal |
| E. | None of the above |
| Answer» C. Steam remains within the cooker | |
| 8. |
A surface which diffusely reflects and emits tha same amount of energy which it receives by radiation, is known as |
| A. | A perfect surface |
| B. | A perfect grey surface |
| C. | A perfect white surface |
| D. | A perfect radiating surface |
| E. | None of the above |
| Answer» D. A perfect radiating surface | |
| 9. |
Exhaust gases from a engine possess |
| A. | Chemical energy |
| B. | Solar energy |
| C. | Potential energy |
| D. | Stored energy |
| E. | Kinetic energy |
| Answer» E. Kinetic energy | |
| 10. |
Which one of the following is an indirect reaction device? |
| A. | Turbojet |
| B. | Ramjet |
| C. | Pulsejet |
| D. | Propeller |
| E. | All of the above |
| Answer» D. Propeller | |
| 11. |
Cetane number of a diesel fuel is a measure of its |
| A. | volatility |
| B. | Pulsejet |
| C. | delay period |
| D. | viscosity |
| E. | ignition quality |
| Answer» E. ignition quality | |
| 12. |
A thermistor is a |
| A. | Thermocouple |
| B. | Thermometer |
| C. | Thermos flask |
| D. | Miniature resistance |
| E. | None of the above |
| Answer» D. Miniature resistance | |
| 13. |
Which of the following is a reversible process? |
| A. | Extension and compression of a spring |
| B. | Diffusion |
| C. | Free expansion |
| D. | Throttling |
| E. | Combustion |
| Answer» A. Extension and compression of a spring | |
| 14. |
Power required for the engine is |
| A. | 7.75 kW |
| B. | 8.88 kW |
| C. | 9.23 kW |
| D. | 6.60 kW |
| E. | Pulsejet |
| Answer» C. 9.23 kW | |
| 15. |
According to Charle's law |
| A. | At constant pressure the volume of a gas is proportional to its temperature |
| B. | At constant pressure the volume of a gas is proportional to its absolute temperature |
| C. | At constant gauge pressure the molecular folume of a gas is proportional to its absolute temperature |
| D. | At constant volume the absolute pressure is proportional to absolute temperature |
| E. | None of the above |
| Answer» A. At constant pressure the volume of a gas is proportional to its temperature | |
| 16. |
The mean free path of a gas least depends on |
| A. | volume of gas |
| B. | viscosity of gas |
| C. | Pulsejet |
| D. | density of gas |
| E. | pressure of gas |
| Answer» A. volume of gas | |
| 17. |
The value of universal gas constant in S.I. units is |
| A. | 831.4 J/kg mole/?k |
| B. | 8314 J/kg mole/?k |
| C. | 8.314 J/kg mole/?k |
| D. | 83.14 J/kg mole/?k |
| E. | 0.8314 J/kg mole/?k |
| Answer» B. 8314 J/kg mole/?k | |
| 18. |
Which of the following valve is installed between the boiler and the feed pump? |
| A. | Flow of c*ck |
| B. | Pulsejet |
| C. | Steam stop valve |
| D. | Throttle valve |
| E. | Feed check valve |
| Answer» E. Feed check valve | |
| 19. |
Thermodynamic equilibrium is completely defined by the specifications of |
| A. | Internal energy |
| B. | Enthalpy |
| C. | Generalized displacements |
| D. | All the above together |
| E. | None of the above |
| Answer» D. All the above together | |
| 20. |
A gas (inversion temperature Ti) undergoing Joule Thomson expansion at temperature T will produce cooling effect only when |
| B. | Ti < T |
| C. | Ti > T |
| D. | Pulsejet |
| E. | Ti = T |
| Answer» B. Ti < T | |
| 21. |
During an adiabatic expansion, the increase in volume is associated with |
| A. | decrease in pressure and increase in temperature |
| B. | increase in pressure and decrease in temperature |
| C. | Decrease in pressure and decrease in temperature |
| D. | Pulsejet |
| E. | increase in pressure and increase in temperature |
| Answer» C. Decrease in pressure and decrease in temperature | |
| 22. |
The mean free path of a gas molecule increases with |
| A. | increase in pressure |
| B. | increase in density |
| C. | increase in temperature |
| D. | Pulsejet |
| E. | decrease in temperature |
| Answer» C. increase in temperature | |
| 23. |
In a Carnot cycle the heat is rejected at |
| A. | Constant pressure |
| B. | Constant temperature |
| C. | Constant entropy |
| D. | Constant enthalpy |
| E. | Constant volume |
| Answer» B. Constant temperature | |
| 24. |
Which of the following statement is incorrect? |
| A. | Total heat of steam is less than the total weight of dry and super saturated steam |
| B. | Total heat of super heated steam is more than the total heat of wet steam |
| C. | Latent heat of steam at critical pressure is zero |
| D. | Latent heat per kg of steam decreases as the pressure of steam increases |
| E. | None of the above |
| Answer» D. Latent heat per kg of steam decreases as the pressure of steam increases | |
| 25. |
Non-dimensional numbers generally involved in case of heat transfer from horizontal cylinders by natural convection are |
| A. | Reynolds number |
| B. | Nusselt number |
| C. | Prandtl number |
| D. | Grashof number |
| E. | (B), (C) and (D) above |
| Answer» E. (B), (C) and (D) above | |