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Consider the following statements regarding C.I. engine : 1. C.I. engines are more bulky than S.I. engines 2. C.I. engines are more efficient than S.I. engines 3. Lighter flywheels are required in C.I. engines Which of the above statements are correct? (a) 1 and 3 only (b) 2 and 3 only (c) 1 and 2 only (d) 1, 2 and 3 |
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Answer» (c) 1 and 2 only Because of higher compression ratios and higher pressure ratio involved, C.I. engine require stronger engine parts, and inherently heavier. The C.I. engines may be 2 to 3 times heavier than comparable S.I. engines. The use of higher compression ratio in C.I. engines as compared to S.I. engine results in higher thermal efficiency for the C.I. engine. Lighter or heavier flywheel requirements of engine depends on Stroke of the engine. In four stroke, flywheel is heavier than two stroke due to fluctuation of load and only one power stroke in 360 degree of rotation. |
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