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Theory of Machine

Theory of Machine
A pantograph is a mechanism with

Lower pairs
Higher pairs
Rolling pairs
Turning pairs

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Theory of Machine
In a screw jack, the effort required to lower the load W is given by

P = W tan(α - φ)
P = W tan(φ - α)
P = W cos(α + φ)
P = W tan(α + φ)

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Theory of Machine
When the axes of the first and last wheels are coaxial, then the train is known as

Simple train of wheels
Reverted gear train
Compound train of wheels
Epicyclic gear train

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Theory of Machine
The stress induced in a body will be shear stress, when it is subjected to

Longitudinal vibrations
None of these
Transverse vibrations
Torsional vibrations

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × NO
ω² × CN
ω² × QN
ω² × CO

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Theory of Machine
In a reciprocating steam engine, which of the following forms a kinematic link?

Crankshaft and flywheel
Flywheel and engine frame
Piston rod and connecting rod
Cylinder and piston

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