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Theory of Machine

Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

90°
360°
180°
0°

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Theory of Machine
Scotch yoke mechanism is used to generate

Logarithms
Inversions
Square roots
Sine functions

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Theory of Machine
Which of the following would constitute a link?

Piston, crank pin and crank shaft
Piston, piston rod and cross head
Piston and piston rod
Piston rod and cross head

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Theory of Machine
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ω² (R - r₁) sinθ
ω² r₁ sinθ
ω² (R - r₁) cosθ
ω² R cosθ

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

fn/2
8 fn
4 fn
2 fn

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Theory of Machine
In a steam engine, the link constitutes a

All of these
Crank pin, crankshaft and flywheel
Piston, piston rod and cross-head
Connecting rod with big and small end brasses, caps and bolts

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