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Theory of Machine

Theory of Machine
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

Sum
Difference
Product
Ratio

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Theory of Machine
The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

3 Hz
6π Hz
6 Hz
3π Hz

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Theory of Machine
The working depth of a gear is the radial distance from the

Addendum circle to the clearance circle
Top of a tooth to the bottom of a tooth
Pitch circle to the top of a tooth
Pitch circle to the bottom of a tooth

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Theory of Machine
The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, and more than co2r
0, 0
cor, 0
0, and less than coV

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Theory of Machine
The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

cos (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ cos (θ + φ) + 1
sin (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ sin (θ + φ) + 1

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Theory of Machine
Which of the following is a lower pair?

Piston and cylinder
Cam and follower
Both (A) and (B) above
Ball and socket i

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