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Theory of Machine

Theory of Machine
Which of the following is a pendulum type governor?

None of these
Hartnell governor
Watt governor
Porter governor

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Theory of Machine
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed

Pickering governor
Inertia governor
Wilson Hartnell governor
Hartung governor

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Theory of Machine
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω cosθ/(n² - cos²θ)1/2
ω sinθ/(n² - cos²θ)1/2
ω cosθ/(n² - sin²θ)1/2
ω sinθ/(n² - sin²θ)1/2

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 90° - φ
α = 45° + φ/2
α = 90° + φ
α = 45° - φ/2

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Theory of Machine
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism

1, 2 and 4
1, 3 and 4
1, 2 and 3
2, 3 and 4

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Theory of Machine
The example of rolling pair is

Ball bearing and roller bearing
Bolt and nut
Ball and socket joint
Lead screw of a lathe

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