MCQOPTIONS
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This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Ic Engine knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The frictional mean effective pressure ____________ as the compression ratio is increased. |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 2. |
When a smaller number of large cylinders are used, the friction and economy improve. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Blowby losses ____________ directly with compression ratio. |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» C. remains same | |
| 4. |
____________ losses are caused due to the leakage of combustion products past the piston from the cylinder into the crankcase. |
| A. | Pumping |
| B. | Blowby |
| C. | Pressure |
| D. | None of the mentioned |
| Answer» C. Pressure | |
| 5. |
BLOWBY_LOSSES______________DIRECTLY_WITH_COMPRESSION_RATIO.?$ |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» C. remains same | |
| 6. |
The frictional mean effective pressure ____________ as the compression ratio is increased.$ |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 7. |
When_a_smaller_number_of_large_cylinders_are_used,_the_friction_and_economy_improve.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
____________ losses are caused due to the leakage of combustion products past the piston from the cylinder into the crankcase? |
| A. | Pumping |
| B. | Blowby |
| C. | Pressure |
| D. | None of the mentioned |
| Answer» C. Pressure | |
| 9. |
Combustion chamber pump loss is caused due to the pumping work required to pump gases into and out of the pre-combustion chamber. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The exhaust throttling loss occurs due to the restrictions imposed by air cleaner, carburetor venturi, throttle valve, intake manifold and intake valve. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
If due attention is not given to the valve size, valve timing and valve flow coefficients there may be a substantial loss with the increase in engine speed. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
The standard practice for sizing the exhaust valve is to make them a certain percentage ____________ than the inlet valves. |
| A. | larger |
| B. | smaller |
| C. | unpredictable |
| D. | none of the mentioned |
| Answer» C. unpredictable | |
| 13. |
The pumping loss is negligible in two-stroke cycle engines. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
In four stroke cycle engines, an ample amount of ____________ is used during intake and exhaust processes. |
| A. | heat |
| B. | pressure |
| C. | power |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 15. |
The difference between I.P. and B.P. is known as total engine friction loss. |
| A. | True |
| B. | False |
| Answer» B. False | |