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Theory of Machine

Theory of Machine
For fluctuating loads, well suited bearing is

Thrust bearing
Ball bearing
Needle roller bearing
Roller bearing

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Theory of Machine
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

Soundness would depend upon which link is kept fixed
Data is not sufficient to determine same
Not sound
Kinematically sound

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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

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

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Theory of Machine
The frequency of oscillation of a torsional pendulum is

2πk/r. √(g/l)
r/2πk. √(g/l)
r/2πk. √(l/g)
2πr/k. √(g/l)

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

10°
30°
14°
20°

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Theory of Machine
In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

16
32
25
12

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