Internal Combustion Engines
Compression ratio of I.C. Engines is

Volume displaced by piston per stroke and clearance volume in cylinder
The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Ratio of pressure after compression and before compression
Swept volume/cylinder volume

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP