Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Positive throughout
Positive during major portion of the stroke
Negative during major portion of the stroke
Negative throughout

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the center of drum, and n = Number of blocks)

T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n
T₁/T₂ = μ. θ. n
T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n
T₁/T₂ = (μ θ)n

ANSWER DOWNLOAD EXAMIANS APP