Internal Combustion Engines
For the same compression ratio

Compression ratio has nothing to do with efficiency
Both Otto and Diesel cycles are, equally efficient
Diesel cycle is more efficient than Otto
Otto cycle is more efficient than the Diesel

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Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging at high altitudes is essential
Supercharging results in fuel economy
Supercharging reduces knocking in diesel engines
There can be limited supercharging in petrol engines because of detonation

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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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