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Theory of Machine

Theory of Machine
The type of gears used to connect two non parallel and non intersecting shafts is

Helical gear
Spur gear
Spiral gear
Bevel gear

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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

2.22 mm
2.50 mm
2 mm
3.0 mm

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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 distance between fixed pivots of crank and followers is

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

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Theory of Machine
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.

None of the listed here
Smaller OR Larger
Smaller
Larger

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Theory of Machine
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

Prime circle
Base circle
Pitch curve
Pitch circle

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Theory of Machine
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

Remains constant
Increases
None of these
Decreases

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