MCQOPTIONS
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MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The process or systems that do not involve heat are called |
| A. | a) isothermal processes |
| B. | b) equilibrium processes |
| C. | c) adiabatic processes |
| D. | d) steady processes |
| Answer» D. d) steady processes | |
| 2. |
Which of the following is not a property of the system |
| A. | a) temperature |
| B. | b) pressure |
| C. | c) specific volume |
| D. | d) heat |
| Answer» E. | |
| 3. |
The first law of thermodynamics for steady flow |
| A. | a) accounts for all energy entering & leaving a control volume |
| B. | b) is an energy balance for a specified mass of fluid |
| C. | c) is an expression of the conservation of linear momentum |
| D. | d) is primarily concerned with heat transfer |
| Answer» B. b) is an energy balance for a specified mass of fluid | |
| 4. |
Steady flow process requires that |
| A. | a) conditions do not change with time at any point |
| B. | b) conditions are the same at adjacent points at any instant |
| C. | c) conditions change steadily with the time |
| D. | d) is constant |
| Answer» B. b) conditions are the same at adjacent points at any instant | |
| 5. |
Internal energy of a perfect gas depends on |
| A. | a) temperature, specific heats & pressure |
| B. | b) temperature, specific heats & enthalpy |
| C. | c) temperature, specific heats & entropy |
| D. | d) temperature only |
| Answer» E. | |
| 6. |
A control volume refers to |
| A. | a) a fixed region in space |
| B. | b) a specified mass |
| C. | c) an isolated system |
| D. | d) a reversible process only |
| Answer» B. b) a specified mass | |
| 7. |
If all the variables of a stream are independent of time it is said to be in |
| A. | a) steady flow |
| B. | b) unsteady flow |
| C. | c) uniform flow |
| D. | d) closed flow |
| Answer» B. b) unsteady flow | |
| 8. |
A system comprising a single phase is called a |
| A. | a) closed system |
| B. | b) open system |
| C. | c) isolated system |
| D. | d) homogeneous system |
| Answer» E. | |
| 9. |
According to kinetic theory of heat |
| A. | a) temperature should rise during boiling |
| B. | b) temperature should fall during freezing |
| C. | c) at low temperature all bodies are in solid state |
| D. | d) at absolute zero there is absolutely no vibration of molecules |
| Answer» E. | |
| 10. |
The condition for the reversibility of a cycle is |
| A. | a) the pressure & temperature of the working substance must not differ, appreciably, from those of |
| B. | a) all the processes, taking place in the cycle of operation, must be extremely slow |
| C. | c) the working parts of the engine must be friction free |
| D. | d) all of the above |
| Answer» E. | |
| 11. |
A series of operations, which take place in a certain order & restore the initial condition is known as |
| A. | a) reversible cycle |
| B. | b) irreversible cycle |
| C. | c) thermodynamic cycle |
| D. | d) none of the above |
| Answer» D. d) none of the above | |
| 12. |
One joule (J) is equal to |
| A. | a) 1 nm |
| B. | b) knm |
| C. | c) 10 nm/s |
| D. | d) 10 knm/s |
| Answer» B. b) knm | |
| 13. |
One watt is equal to |
| A. | a) 1 nm/s |
| B. | b) 1n/min |
| C. | c) 10 n/s |
| D. | d) 100 nm/s |
| Answer» B. b) 1n/min | |
| 14. |
The unit of energy in SI units is |
| A. | a) joule (j) |
| B. | b) joule metre (jm) |
| C. | c) watt (w) |
| D. | d) joule/metre (j/m) |
| Answer» B. b) joule metre (jm) | |
| 15. |
Absolute zero temperature is taken as |
| A. | a) -273??c |
| B. | b) 273??c |
| C. | c) 237??c |
| D. | d) -373??c |
| Answer» B. b) 273??c | |
| 16. |
The absolute zero pressure will be |
| A. | a) when molecular momentum of the system becomes zero |
| B. | b) at sea level |
| C. | c) at the temperature of -273 k |
| D. | d) under vaccum conditions |
| Answer» B. b) at sea level | |
| 17. |
The value of one bar (in SI units) is equal to |
| A. | a) 100 n/m?? |
| B. | b) 1000 n/m?? |
| C. | c) 1??10â´ n/m?? |
| D. | d) 1??10âµ n/m?? |
| Answer» E. | |
| 18. |
The temperature at which the volume of a gas becomes zero is called |
| A. | a) absolute scale of temperature |
| B. | b) absolute zero temperature |
| C. | c) absolute temperature |
| D. | d) none of the above |
| Answer» C. c) absolute temperature | |
| 19. |
When two bodies are in thermal equilibrium with a third body they are also in thermal equilibrium with each other. This statement is called |
| A. | a) zeroth law of thermodynamics |
| B. | b) first law of thermodynamics |
| C. | c) second law of thermodynamics |
| D. | d) kelvin planck\s law |
| Answer» B. b) first law of thermodynamics | |
| 20. |
Which of the following is the extensive property of a thermodynamic system |
| A. | a) pressure |
| B. | b) volume |
| C. | c) temperature |
| D. | d) density |
| Answer» C. c) temperature | |
| 21. |
Which of the following is an intensive property of a thermodynamic system |
| A. | a) volume |
| B. | b) temperature |
| C. | c) mass |
| D. | d) energy |
| Answer» C. c) mass | |
| 22. |
An isolated system |
| A. | a) is a specified region where transfer of energy and/or mass take place |
| B. | b) is a region of constant mass & only energy is allowed to cross the boundaries |
| C. | c) cannot transfer either energy or mass to or from the surroundings |
| D. | d) is one in which mass within the system is not necessarily constant |
| Answer» D. d) is one in which mass within the system is not necessarily constant | |
| 23. |
An open system is one in which |
| A. | a) heat & work cross the boundary of the system, but the mass of the working substance does not |
| B. | b) mass of working substance crosses the boundary of the system but the heat & work do not |
| C. | c) both the heat & work as well as mass of the working substance cross the boundary of the system |
| D. | d) neither the heat & work nor the mass of the working substances cross the boundary of the system |
| Answer» D. d) neither the heat & work nor the mass of the working substances cross the boundary of the system | |
| 24. |
A definite area or space where some thermodynamic process takes place is known as |
| A. | a) thermodynamic system |
| B. | b) thermodynamic cycle |
| C. | c) thermodynamic process |
| D. | d) thermodynamic law |
| Answer» B. b) thermodynamic cycle | |