Question

Find mechanical efficiency of 2 points the above engine configuration
O 35%
O 53.8%
O 87.52 %
O None of these​

Answer 1

Answer:

The mechanical efficiency of the engine is the ratio between the brake mean effective pressure and the indicated mean effective pressure:

ηm=BMEPIMEP(5)

Replacing equation (3) in (5) gives:

ηm=IMEP−FMEPIMEP=1−FMEPIMEP(6)

From equation (6) we can see that, the lower is the friction mean effective pressure (FMEP), the higher is the mechanical efficiency of the internal combustion engine. So, reducing the “friction” losses for a given engine, will reduce the fuel consumption and improve the power output.

Explanation:

35%