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The stroke and bore of a four stroke spark ignition engine are 250 mm and 200 mm respectively. The clearance volume is 0.001 m3. If the specific heat ratio γ = 1.4, the air-standard cycle efficiency of the engine is
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- 46.40%
- 56.10%
- 58.20%
- 62.80%
- 46.40%
Correct Option: C
Here, VC = .001 m3
| Vs | d2l = | (0.2)2 × (0.25) | ||
| 4 | 4 |
| ∴ Compression ratio, r = 1 + | = 0.85 | |
| Vc |
| ∴ η = 1 - | = 58.20% | |
| rγ - 1 |
| ∴ η = 1 - | = 58.20% | |
| (0.85)0.4 |
