MCQOPTIONS
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MCQOPTIONS
This section includes 102 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 material most commonly used for sheilding is |
| A. | carbon |
| B. | lead |
| C. | concrete |
| D. | all of these |
| Answer» D. all of these | |
| 2. |
The sensing element in the control system of nuclear reactors measure the __________ of the neutron flux in the reactor. |
| A. | temperature |
| B. | volume |
| C. | density |
| D. | none of these |
| Answer» D. none of these | |
| 3. |
A reactor capable of converting a fertile material into fissile isotopes is called regenerative reactor. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 4. |
If the fuel is rich in fissionable material, the reactor can be made more compact than if the percentage of fissionable atoms is small. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 5. |
Special reactors, called breeder reactors, supply a net gain of fissionable material. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The reflectivity of a reflector is defined as the fraction of neutrons entering the reflector which are returned to the core. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 7. |
Materials which make good moderators do not make good reflectors. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 8. |
Reflector in nuclear power plants is used to reflect neutrons back into the active core. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Enriched uranium may contain fissionable contents from |
| A. | 1 to 40% |
| B. | 10 to 50% |
| C. | 1 to 80% |
| D. | 1 to 99% |
| Answer» E. | |
| 10. |
Light weight substances can not be effective moderators. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
The slowing down of fast neutrons is desirable because slow moving neutrons are more effective than fast neutrons in triggering fission. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 12. |
The size of a reactor at which the chain reaction can be initiated (i.e. when system becomes critical) with just enough fissionable material (called critical mass of fuel) is known as critical size of reactor. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 13. |
An atom bomb utilises uncontrolled nuclear fission. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
In natural uranium, the constituents of three naturally occuring isotopes are |
| A. | U234 = 0.006%, U235 = 0.712% and U238 = 99.282% |
| B. | U234 = 0.712%, U235 = 0.006% and U238 = 99.282% |
| C. | U234 = 99.282%, U235 = 0.006% and U238 = 0.712% |
| D. | U234 = 0.006%, U235 = 99.282% and U238 = 0.712% |
| Answer» B. U234 = 0.712%, U235 = 0.006% and U238 = 99.282% | |
| 15. |
Each fission of U235 produces on the average __________ fast neutrons as a product of reaction. |
| A. | 2.46 |
| B. | 24.6 |
| C. | 246 |
| D. | 2460 |
| Answer» B. 24.6 | |
| 16. |
The unit million electron volts (Mev) is commonly used to measure the nuclear energy. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
The first nuclear power plant in India was located at |
| A. | Kota |
| B. | Tarapur |
| C. | Bareilly |
| D. | none of these |
| Answer» C. Bareilly | |
| 18. |
A nuclear power plant differs from a conventional steam power station only in the steam generating part. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 19. |
If V1 is the jet velocity and V0 is the vehicle velocity, then the propulsive efficiency of a rocket is given by |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» B. [B]. | |
| 20. |
A turbo-jet does not require a turbine to drive the compressor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
If V1 is the jet velocity and V0 is the vehicle velocity, then propulsive efficiency of a turbo-jet engine is |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» D. [D]. | |
| 22. |
The turbine of the turbo-prop engine is __________ that of the turbo-jet engine. |
| A. | same as |
| B. | smaller than |
| C. | bigger than |
| Answer» D. | |
| 23. |
The volumetric efficiency ofa well designed engine may be |
| A. | 30 to 40% |
| B. | 40 to 60% |
| C. | 60 to 70% |
| D. | 75 to 90% |
| Answer» E. | |
| 24. |
The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats) |
| A. | 1 - rγ - 1 |
| B. | 1 + rγ - 1 |
| C. | [C]. |
| D. | none of these |
| Answer» D. none of these | |
| 25. |
The relative efficiency of an I.C. engine is the ratio of the indicated thermal efficiency to the air standard efficiency. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 26. |
The overall efficiency is defined as the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 27. |
The brake power is always greater than indicated power. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 28. |
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S - Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres) |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | all of these |
| Answer» E. | |
| 29. |
The indicated power for multi-cylinder engine will be same as that of a single cylinder engine. |
| A. | True |
| B. | False |
| Answer» C. | |
| 30. |
Number of working strokes per min. for a four stroke cycle engine are __________ the speed of the engine in r.p.m. |
| A. | equal to |
| B. | one-half |
| C. | twice |
| D. | four-times |
| Answer» C. twice | |
| 31. |
The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases. |
| A. | increase |
| B. | decrease |
| Answer» C. | |
| 32. |
The indicated mean effective pressure of an engine is obtained from the indicator diagram drawn with the help of an engine indicator. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 33. |
Which of the following statement is correct regarding normal cetaine? |
| A. | It is a standard fuel used for knock rating of diesel engines. |
| B. | Its chemical name is normal-hexadecane. |
| C. | It has long carbon chain structure. |
| D. | all ofthe above |
| Answer» E. | |
| 34. |
A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 35. |
The knocking tendency in spark ignition engines can be decreased by adding dopes like tetra ethyle lead and ethylene dibromide. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 36. |
Which of the following fuel detonates readily ? |
| A. | Benzene |
| B. | Iso-octane |
| C. | Normal heptane |
| D. | Alcohol |
| Answer» D. Alcohol | |
| 37. |
Which of the following fuel has little tendency towards detonation ? |
| A. | Benzene |
| B. | Iso-octane |
| C. | Normal heptane |
| D. | Alcohol |
| Answer» C. Normal heptane | |
| 38. |
In petrol engines, advancing of the spark timing will __________ the knocking tendency. |
| A. | not effect |
| B. | decrease |
| C. | increase |
| Answer» D. | |
| 39. |
In petrol engines, using a fixed octane rating fuel, the increase in compression ratio will not effect the knocking tendency. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 40. |
In petrol engines, using a fixed octane rating fuel, the increase in engine speed will decrease the knocking tendency. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 41. |
The cetane (C16H34) which is a straight chain paraffin is assigned a cetane number of |
| A. | 0 |
| B. | 50 |
| C. | 100 |
| D. | 120 |
| Answer» D. 120 | |
| 42. |
Alpha-methyl-naphthalene (C11 H10) has a cetane number of |
| A. | 0 |
| B. | 50 |
| C. | 100 |
| D. | 120 |
| Answer» B. 50 | |
| 43. |
Iso-octane (C8H18) has octane number of |
| A. | 0 |
| B. | 50 |
| C. | 100 |
| D. | 120 |
| Answer» D. 120 | |
| 44. |
The normal heptane (C7H16) is given a rating of __________ octane number. |
| A. | 0 |
| B. | 50 |
| C. | 100 |
| D. | 120 |
| Answer» B. 50 | |
| 45. |
Which of the following does not relate to a spark ignition engine ? |
| A. | Ignition coil |
| B. | Spar kplug |
| C. | Carburettor |
| D. | Fuel injector |
| Answer» E. | |
| 46. |
A fuel will detonate less if it has higher self ignition temperature. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 47. |
The higher combustion chamber wall temperature in compression ignition engines will __________ knocking tendency. |
| A. | increase |
| B. | reduce |
| C. | not effect |
| Answer» C. not effect | |
| 48. |
The delay period in oil engines increases with increase in the speed of engine. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 49. |
Spark plugs in automobiles generally have a gap between |
| A. | 0.3 to 0.7 mm |
| B. | 0.2 to 0.8 mm |
| C. | 0.4 to 0.9 mm |
| D. | 0.6 to 1.8 mm |
| Answer» E. | |
| 50. |
In qualitative governing, the quantity of fuel is varied to suit the load on the engine and the total charge of air is altered. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |