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During a Morse test on a 4 cylinder engine, the following measurements of brake power were taken at constant speed. All cylinders firing 3037 kW Number 1 cylinder not firing 2102 kW Number 2 cylinder not firing 2102 kW Number 3 cylinder not firing 2100 kW Number 4 cylinder not firing 2098 kW The mechanical efficiency of the engine is
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- 91.53%
- 85.07%
- 81.07%
- 61.22%
Correct Option: C
Given: B.P. = 3037 kW
(I.P.)1 = 3037 – 2102 = 935 kW
(I.P.)2 = 3037 – 2102 = 935 kW
(I.P.)3 = 3037 – 2100 = 937 kW
(I.P.)4 = 3037 – 2098 = 937 kW
Total I.P. of the cylinder
= (I.P)1 + (I.P)2 + (I.P)3 + (I.P)4
= 935 + 935 + 937 + 937 = 3746 kW
∴ Mechnical efficiency of the engine
| = | = | = 87.07% | I.P. | 3746 |
