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Theory of Machine

Theory of Machine
In an ideal machine, the output as compared to input is

May be less or more depending on efficiency
Equal
More
Less

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

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Theory of Machine
The example of rolling pair is

Ball and socket joint
Lead screw of a lathe
Bolt and nut
Ball bearing and roller bearing

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative throughout
Positive during major portion of the stroke
Negative during major portion of the stroke
Positive throughout

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly less than 45 mm
45 mm
Slightly more than 45 mm
95 mm

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Theory of Machine
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

80 RPM
data are insufficient
90 RPM
100 RPM

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