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Theory of Machine

Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Stable
Unstable
Isochronous
Hunt

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Theory of Machine
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

Pitch circle
Base circle
Prime circle
Pitch curve

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Theory of Machine
The example of completely constrained motion is a

Motion of a piston in the cylinder of a steam engine
Motion of a square bar in a square hole
Motion of a shaft with collars at each end in a circular hole
All of these

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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

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

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ - r₂) (y/x)
(r₁ - r₂) (x/y)
(r₁ + r₂) (x/y)
(r₁ + r₂) (y/x)

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Theory of Machine
Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = (ω₁ + ω₂)/2]

2.E.CS
I.ω.(ω₁ - ω₂)
All of these
I.ω².CS

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