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Theory of Machine

Theory of Machine
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.6
0.8
0.2
0.4

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Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

Watt's mechanism
All of these
Robert's mechanism
Grasshopper mechanism

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Theory of Machine
In an open pair, the two elements of a pair

Are not held together mechanically
Are kept in contact by the action of external forces, when in motion
Have a line or point contact when in motion
Have a surface contact when in motion

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

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Theory of Machine
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

180° and 270°
45° and 225°
270° and 360°
90° and 180°

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Theory of Machine
The maximum value of the pressure angle in case of cam is kept as

20°
14°
10°
30°

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