MCQOPTIONS
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MCQOPTIONS
This section includes 39 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 2. |
The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | all of these |
| Answer» E. | |
| 3. |
One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas. |
| A. | 8/3 |
| B. | 11/3 |
| C. | 11/7 |
| D. | 7/3 |
| Answer» E. | |
| 4. |
The sum of internal energy ( U ) and the product of pressure and volume ( p . v ) is known as |
| A. | workdone |
| B. | entropy |
| C. | enthalpy |
| D. | none of these |
| Answer» D. none of these | |
| 5. |
An isothermal process is governed by |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Avogadro's law |
| Answer» B. Charles' law | |
| 6. |
When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency. |
| A. | zero |
| B. | 1/5 |
| C. | 4/5 |
| D. | 1 |
| Answer» B. 1/5 | |
| 7. |
The constant pressure, constant volume and constant pvn processes are regarded as irreversible process. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 8. |
The specific heat of water is |
| A. | 1.817 |
| B. | 2512 |
| C. | 4.187 |
| D. | none of these |
| Answer» D. none of these | |
| 9. |
The absolute zero temperature is taken as |
| A. | -273°C |
| B. | 273°C |
| C. | 237°F |
| D. | -237°F |
| Answer» B. 273°C | |
| 10. |
One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas. |
| A. | All |
| B. | 4/7 |
| C. | 11/4 |
| D. | 9/7 |
| Answer» C. 11/4 | |
| 11. |
The kinetic energy of molecules of a gas becomes zero at absolute zero temperature. |
| A. | Agree |
| B. | Disagree |
| C. | - |
| D. | - |
| Answer» B. Disagree | |
| 12. |
According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure. |
| A. | equal to |
| B. | directly proportional to |
| C. | inversely proportional to |
| D. | - |
| Answer» C. inversely proportional to | |
| 13. |
Coal gas is obtained by mixing coal and gas at ambient conditions. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» C. - | |
| 14. |
In the first law of thermodynamics, the total energy of the system remains constant. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 15. |
The value of gas constant ( R ) in S. I. units is |
| A. | 0.287 J/kgK |
| B. | 2.87 J/kgK |
| C. | 28.7 J/kgK |
| D. | 287 J/kgK |
| Answer» E. | |
| 16. |
Which of the following gas is mostly used in town for street and domestic lighting and heating? |
| A. | Producer gas |
| B. | Coal gas |
| C. | Mond gas |
| D. | Coke oven gas |
| Answer» C. Mond gas | |
| 17. |
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called |
| A. | cracking |
| B. | carbonisation |
| C. | fractional distillation |
| D. | full distillation |
| Answer» D. full distillation | |
| 18. |
The value of specific heat at constant pressure ( c p ) is __________ that of at constant volume ( c v ). |
| A. | less than |
| B. | equal to |
| C. | more than |
| D. | - |
| Answer» D. - | |
| 19. |
If the value of n = 0 in the equation pv n = C , then the process is called |
| A. | constant volume process |
| B. | adiabatic process |
| C. | constant pressure process |
| D. | isothermal process |
| Answer» D. isothermal process | |
| 20. |
There is no change in internal energy in an isothermal process. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 21. |
According to Gay-Lussac law for a perfect gas, p / T = constant, if v is kept constant. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 22. |
The efficiency of Stirling cycle is __________ Carnot cycle. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | - |
| Answer» D. - | |
| 23. |
Carbonisation of coal consists of |
| A. | drying and crushing the coal to a fine powder |
| B. | moulding the finely ground coal under pressure with or without a binding material |
| C. | heating the wood with a limited supply of air to temperature not less than 280°C |
| D. | none of the above |
| Answer» E. | |
| 24. |
The ratio of specific heat at constant pressure ( c p ) and specific heat at constant volume ( c v ) is |
| A. | equal to one |
| B. | less than one |
| C. | greater than one |
| D. | none of these |
| Answer» D. none of these | |
| 25. |
The atomic mass of oxygen is |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» D. 32 | |
| 26. |
The entropy __________ in an irreversible cyclic process. |
| A. | remains constant |
| B. | decreases |
| C. | increases |
| D. | - |
| Answer» D. - | |
| 27. |
The efficiency of Diesel cycle approaches to Otto cycle efficiency when |
| A. | cut-off is increased |
| B. | cut-off is decreased |
| C. | cut-off is zero |
| D. | cut-off is constant |
| Answer» D. cut-off is constant | |
| 28. |
The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas. |
| A. | one-half |
| B. | one-third |
| C. | two-third |
| D. | three-fourth |
| Answer» D. three-fourth | |
| 29. |
Workdone in a free expansion process is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | positive |
| Answer» B. minimum | |
| 30. |
Which of the following has the minimum atomic mass? |
| A. | Oxygen |
| B. | Sulphur |
| C. | Nitrogen |
| D. | Carbon |
| Answer» E. | |
| 31. |
The processes occuring in open system which permit the transfer of mass to and from the system, are known as |
| A. | flow processes |
| B. | non-flow processes |
| C. | adiabatic processes |
| D. | none of these |
| Answer» B. non-flow processes | |
| 32. |
Which of the following is the lightest and most volatile liquid fuel? |
| A. | Gasoline |
| B. | Kerosene |
| C. | Fuel oil |
| D. | - |
| Answer» B. Kerosene | |
| 33. |
When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 34. |
Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» C. - | |
| 35. |
An adiabatic process is one in which |
| A. | no heat enters or leaves the gas |
| B. | the temperature of the gas changes |
| C. | the change in internal energy is equal to the mechanical workdone |
| D. | all of the above |
| Answer» E. | |
| 36. |
There is a loss of heat in an irreversible process. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 37. |
The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called |
| A. | specific heat at constant volume |
| B. | specific heat at constant pressure |
| C. | kilo Joule |
| D. | none of these |
| Answer» B. specific heat at constant pressure | |
| 38. |
A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as |
| A. | Carnot cycle |
| B. | Stirling cycle |
| C. | Otto cycle |
| D. | Diesel cycle |
| Answer» E. | |
| 39. |
All the commercial liquid fuels are derived from natural petroleum (or crude oil). |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |