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Theory of Machine

Theory of Machine
For fluctuating loads, well suited bearing is

Ball bearing
Roller bearing
Needle roller bearing
Thrust bearing

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Theory of Machine
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

ω² r {(n + 1)/n}
ω² r {(n - 1)/n}
ω² r {n/(n + 1)}
ω² r {n/(n - 1)}

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Theory of Machine
Which of the following is an open pair?

Ball and socket joint
Cam and follower
Journal bearing
Lead screw and nut

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Theory of Machine
A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

Free vibration with damping
Forced vibration without damping
Forced vibration with damping
Free vibration without damping

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

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Theory of Machine
The length of a simple pendulum which gives the same frequency as the compound pendulum, is

(kG + l₁²)/ l₁
(kG² + l₁²)/ l₁
kG² + l₁
kG + l₁

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