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Theory of Machine

Theory of Machine
Hart mechanism has

Four links
Twelve links
Six links
Eight links

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Theory of Machine
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

M/(m + M)
(m + M)/m
m/(m + M)
(m + M)/M

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Theory of Machine
The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

3π Hz
3 Hz
6π Hz
6 Hz

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

All of these
Rolling
Pitching
Steering

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Theory of Machine
Which of the following is a higher pair?

Turning pair
Sliding pair
Belt and pulley
Screw pair

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ + ω₂)r
(ω₁ - ω₂)2r
ω₁.ω₂.r
(ω₁ - ω₂)r

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