Theory of Machine
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

180° and 360°
Both (A) and (B)
None of these
0° and 90°

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Theory of Machine
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of a cross belt drive. The length of the belt is

π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x
π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x
π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x
π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x

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

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

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