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Theory of Machine

Theory of Machine
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

Product
Sum
Ratio
Difference

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Theory of Machine
In railway axle boxes, the bearing used is

Double row spherical roller bearing
Cylindrical roller bearing
Double row self aligning ball bearing
Deep groove ball bearing

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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)

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

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Theory of Machine
Creep in belt drive is due to

Material of the pulley
Uneven extensions and contractions due to varying tension
Material of the belt
Larger size of the driver pulley

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

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

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2 mm
3.0 mm
2.50 mm
2.22 mm

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