Theory of Machine
The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively)

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

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Theory of Machine
In a single slider crank chain

Each of the four pairs is a turning pair
Two are turning pairs and two are sliding pairs
Three are turning pairs and one is a sliding pair
One is a turning pair and three are sliding pairs

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Theory of Machine
Which of the following is false statement in respect of differences between machine and structure?

Machines transmit mechanical work, whereas structures transmit forces
Machines modify movement and work, whereas structures modify forces
Efficiency of machines as well as structures is below 100 %
In machines, relative motion exists between its members, whereas same does not exist in case of structures

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