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Theory of Machine

Theory of Machine
When a ship travels in a sea, which of the effect is more dangerous

Rolling
All of these
Steering
Pitching

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Theory of Machine
In a flat collar pivot bearing, the moment due to friction is proportional to

(r₁² - r₂²)/(r₁ + r₂)
(r₁² - r₂²)/(r₁ - r₂)
(r₁³ - r₂³)/(r₁ - r₂)
(r₁³ - r₂³)/(r₁² - r₂²)

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

(1/2) μ W R cosecα
μ W R cosecα
(2/3) μ W R cosecα
(3/4) μ W R cosecα

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

μwr
½μWR
¾μWR
²/₃ μWR

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Theory of Machine
Which of the following mechanisms produces mathematically an exact straight line motion?

Peaucellier's mechanism
Grasshopper mechanism
Watt mechanism
Tchebicheff mechanism

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Theory of Machine
The following is the inversion of slider crank chain mechanism

Oscillating cylinder engine
Whitworth quick return mechanism
Hand pump
All of these

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