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Theory of Machine

Theory of Machine
V-belts are usually used for

None of these
Short drives
Long drives
Long and short drives

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Theory of Machine
Whirling speed of the shaft is the speed at which

Shaft tends to vibrate vigorously in transverse direction
Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate in longitudinal direction
Torsional vibrations occur

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) sinφ]/2
[(r + R) cosφ]/2
[(r² + R²) cosφ]/2
[(r² + R²) sinφ]/2

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Theory of Machine
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

n = 3(l - 1) - 3j - h
n = 2(l - 1) - 3j - h
n = 3(l - 1) - 2j - h
n = 2(l - 1) - 2j - h

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Theory of Machine
Which of the following is an inversion of a double slider crank chain?

Oldham's coupling
All of these
Scotch yoke mechanism
Elliptical trammel

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

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