Theory of Machine
The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

Corners
Outer edge
Inner edge
None of these

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Theory of Machine
Open pairs are those which have

Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Two elements that permit relative motion

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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
In machines, relative motion exists between its members, whereas same does not exist in case of structures
Efficiency of machines as well as structures is below 100 %

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

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

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