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Theory of Machine

Theory of Machine
The lower pair is a

Open pair
Point contact pair
Sliding pair
Closed pair

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Theory of Machine
Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

D-slide valve
Meyer's expansion valve
Flywheel
Governor

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Theory of Machine
The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁ + ω₂)/y
(ω₁ + ω₂) y
(ω₁ × ω₂) y
(ω₁/ω₂) y

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly more than 45 mm
45 mm
Slightly less than 45 mm
95 mm

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Theory of Machine
The size of cam depends upon

Base circle
Pitch circle
Pitch curve
Prime circle

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Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

Parallel to the link joining the points
At 45° to the link joining the points
Perpendicular to the link joining the points
None of the listed here

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