Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel at a high velocity to facilitate atomization
Inject fuel in a chamber of high pressure at the end of compression stroke
All of these
Ensure that penetration is not high

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Internal Combustion Engines
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)

P = (Wl × 2πN)/60 watts
P = [(W - S) π (D + d) N]/60 watts
All of these
P = [(W - S) πDN]/60 watts

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