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Relative Velocity

A 2-stroke en...

Question

A 2-stroke engine having bore = 10 cm and stroke equal to 20 cm produces brake power = 35 kW. Take engine speed = 2000 rpm. The brake mean effective pressure is

A

4.864 bar

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B

6.684 bar

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C

4.684 bar

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D

5.4178 bar

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Solution

The correct option is B 6.684 bar
Brake power = $b m e p \times \frac{L A N}{60}$

Given: N = 2000 rpm
D = 10 cm, L = 20 cm

$\Rightarrow$ Brake power = 35 kW, bmep = ?

$\Rightarrow 35 \times 10^{3} = b m e p \times \frac{\frac{π}{4} \times D^{2} \times L \times 2000}{60}$

$\Rightarrow$ bmep = 6.684 bar

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