Theory of Machine
Idler pulley is used

For changing the direction of motion of the belt
For applying tension
All of the listed here
For increasing velocity ratio

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Theory of Machine
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

(1/2). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]
(1/2). μ W cosec α (r₁ + r₂)
(2/3). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3).μ W cosec α (r₁ + r₂)

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Theory of Machine
The steering of a ship means

Turning of a complete ship in a curve towards right or left, while it moves forward
None of these
Movement of a complete ship up and down in vertical plane about transverse axis
Rolling of a complete ship sideways

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