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Theory of Machine

Theory of Machine
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

Same as
Less than
None of these
More than

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

P = W tan(α - φ)
P = W tan(α + φ)
P = W tan(φ - α)
P = W cos(α + φ)

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

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

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

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Theory of Machine
The power from the engine to the rear axle of an automobile is transmitted by means of

Worm and worm wheel
Spur gears
Bevel gears
Hooke's joint

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Theory of Machine
If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be

Less
Same
More
Data are insufficient to determine same

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