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Theory of Machine

Theory of Machine
The secondary unbalanced force is maximum __________ in one revolution of the crank.

Eight times
Sixteen times
Four times
Two times

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Theory of Machine
Which one of the following is an exact straight line mechanism using lower pairs?

Peaucellier’s mechanism
Grasshopper mechanism
Robert’s mechanism
Watt’s mechanism

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Theory of Machine
Which gear is used for connecting two coplanar and intersecting shafts?

Spur gear
Bevel gear
None of these
Helical gear

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Theory of Machine
Which of the following is an inversion of a single slider crank chain?

All of these
Oscillating cylinder engine
Pendulum pump
Rotary internal combustion engine

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Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Transverse vibrations
All of these
Longitudinal vibrations
Torsional vibrations

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

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