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Theory of Machine

Theory of Machine
Any point on a link connecting double slider crank chain will trace a

Circle
Parabola
Straight line
Ellipse

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Theory of Machine
Elements of pairs held together mechanically is known as

Closed pair
Rolling pair
Mechanical pair
Open pair

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Theory of Machine
A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

P = W tan (α + φ)
P = W tan α
P = W (sin α + μ cos α)
P = W (cos α + μ sin α)

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Theory of Machine
The Klein's diagram is used when

Crank has nonuniform angular acceleration
Crank has nonuniform angular velocity
Crank has uniform angular acceleration
Crank has uniform angular velocity

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Theory of Machine
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Tip of both gear and pinion
Tip of the gear tooth and flank of pinion
Flanks of both gear and pinion
Tip of the pinion and flank of gear

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Theory of Machine
Flexible coupling is used because

It prevents shock transmission and eliminates stress reversals
It transmits shocks gradually
It is easy to disassemble
It is easy to engage and disengage

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