MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Theoretically, a four stroke cycle engine should develop __________ power as that of a two stroke cycle engine. |
| A. | double |
| B. | half |
| C. | same |
| D. | four times |
| Answer» C. same | |
| 2. |
The energy released during the fission of one atom of Uranium – 235 in million electron volts is about |
| A. | 200 |
| B. | 300 |
| C. | 100 |
| D. | 400 |
| Answer» B. 300 | |
| 3. |
In a four stroke cycle diesel engine, the exhaust valve |
| A. | opens at bottom dead centre and closes at top dead centre |
| B. | opens at 60° after top dead centre and closes at 10° before top dead centre |
| C. | opens at 30° before bottom dead cnetre and closes at 10° after top dead centre |
| D. | may open and close anywhere |
| Answer» D. may open and close anywhere | |
| 4. |
Morse test is used to determine the I.P. of a |
| A. | four stroke engine |
| B. | single cylinder diesel engine |
| C. | single cylinder petrol engine |
| D. | multi-cylinder engine |
| Answer» E. | |
| 5. |
The working pressure and temperature inside the cylinder of an internal combustion engine is __________ as compared to a steam engine. |
| A. | very low |
| B. | very high |
| C. | high |
| D. | low |
| Answer» C. high | |
| 6. |
A moderator |
| A. | absorbs neutrons |
| B. | accelerates neutrons |
| C. | does not absorb neutrons |
| D. | none of these |
| Answer» D. none of these | |
| 7. |
The advancing of spark timing in spark ignition engines will __________ knocking tendency. |
| A. | none of these |
| B. | reduce |
| C. | increase |
| D. | not effect |
| Answer» D. not effect | |
| 8. |
The correct mixture strength (by weight) for petrol is about |
| A. | 14.6:1 |
| B. | 22.6:1 |
| C. | 20.4:1 |
| D. | 18.5:1 |
| Answer» B. 22.6:1 | |
| 9. |
The inlet valve of a four stroke cycle internal combustion engine remains open for |
| A. | 130° |
| B. | 180° |
| C. | 270° |
| D. | 230° |
| Answer» E. | |
| 10. |
Supercharging __________ the power developed by the engine. |
| A. | all of these |
| B. | increases |
| C. | decreases |
| D. | has no effect on |
| Answer» C. decreases | |
| 11. |
Which of the following statement is correct regarding petrol engines? |
| A. | all of the above |
| B. | The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug. |
| C. | The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition. |
| D. | A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure. |
| Answer» C. The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition. | |
| 12. |
The colour of exhaust from diesel engine is generally. |
| A. | bluish |
| B. | A. white |
| C. | black |
| D. | violent |
| Answer» D. violent | |
| 13. |
The knocking in spark ignition engines can be reduced by |
| A. | none of these |
| B. | increasing the engine speed |
| C. | both (a) and (b) |
| D. | retarding the spark |
| Answer» D. retarding the spark | |
| 14. |
The maximum propulsive efficiency of a turbo-jet engine is at a speed of |
| A. | 3000 km/h |
| B. | 1000 km/h |
| C. | 2000 km/h |
| D. | 2400 km/h |
| Answer» E. | |
| 15. |
In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then __________ is employed. |
| A. | carburettor |
| B. | fuel pump |
| C. | injector |
| D. | none of these |
| Answer» B. fuel pump | |
| 16. |
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine ? |
| A. | inlet valve opening before top dead centre |
| B. | exhaust valve closing after top dead centre |
| C. | inlet valve closing before bottom dead centre |
| D. | inlet valve closing after bottom dead centre |
| Answer» D. inlet valve closing after bottom dead centre | |
| 17. |
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be |
| A. | corrossion resistant |
| B. | stable under nuclear radiation |
| C. | good thermal conductor |
| D. | all of these |
| Answer» E. | |
| 18. |
The delay period in compression ignition engines depends upon |
| A. | nature of the fuel mixture strength |
| B. | relative velocity between the fuel injection and air turbulence pressure of residual gases |
| C. | temperature and pressure in the cylinder at the time of injection |
| D. | all of the above |
| Answer» E. | |
| 19. |
The frictional power (F.P.) is given by |
| A. | F.P. = I.P. - B.P. |
| B. | F.P. = B.P. - I.P. |
| C. | F.P. = B.P./I.P. |
| D. | F.P. = I.P./B.P. |
| Answer» B. F.P. = B.P. - I.P. | |
| 20. |
The nuclear radiators produced in a reactor which must be sheilded are |
| A. | electrons |
| B. | none of these |
| C. | α, β and γ rays |
| D. | neutron and gamma rays |
| Answer» E. | |
| 21. |
he material most commonly used for sheilding is |
| A. | lead |
| B. | carbon |
| C. | concrete |
| D. | all of these |
| Answer» D. all of these | |