MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

6.684 bar

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C

4.684 bar

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

5.4178 bar

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

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

Suggest Corrections

thumbs-up

0

Similar questions

Q. A single cylinder spark ignition 4-stroke engine has a 100 mm bore and 100 mm stroke that run with 20 Nm, at 3000 rpm. The brake mean effective pressure (BMEP) is_________ bar.

Q. A four stroke engine has a displacement volume of

0.04 m^{3}

. The engine runs at 2000 r.p.m and has an power output of 1000 kW. The mean effective pressure (in kPa) is

Q. A 4-stroke gas engine has a cylinder diameter of 25 cm and stroke to bore ratio is 1.9. The following observations are made during the testing of the engine:

(i) Duration of test is 40 min
(ii) Total number of revolutions is 8080
(iii) Total number of explosion is 3300.

Net brake load of the engine is 90 kg and radius of drum is 80 cm. Positive indicated mean effective pressure is 6.4 bar. Pumping mean effective pressure is 0.6 bar. What will be the mechanical efficiency of the engine?

Q. A diesel engine has a bore of 0.1 m, a stroke of 0.14 m, a compression ratio of 19:1 and runs at 2000 RPM (revolutions per minute). Each cycle takes two revolutions and has a mean effective pressure of 1400 kPa. With a total 6 cylinders, the work done per cylinder per power stroke is

Q. An ideal diesel engine has a diameter (bore) of 15 cm and stroke 20 cm. The clearance volume is 10 percent of the swept volume. If the cut-off takes place at 5 percent of the stroke, the air standard efficiency of the engine is _____%.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Relative Motion

PHYSICS

Watch in App

explore_more_icon

Explore more

Relative Velocity

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon