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Theory of Machine

Theory of Machine
Typewriter constitutes

Machine
Structure
Inversion
Mechanism

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Theory of Machine
Which of the following is an example of a higher pair?

All of the listed here
Ball and roller bearing
Belt and rope drive
Toothed gearing

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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
2 fn
8 fn
4 fn

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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) (y/x)
(r₁ - r₂) (x/y)

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Theory of Machine
A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become

16 tp
tp /16
4 tp
tp /4

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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 × QN
ω² × NO
ω² × CN
ω² × CO

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