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Theory of Machine

Theory of Machine
A higher pair has__________.

Surface contact
No contact
None of these
Point contact

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

sin (θ + φ) + 1/ cos (θ - φ) + 1
cos (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 lower pairs are _________ pairs.

Force-closed
None of these
Self-closed
Friction closed

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Theory of Machine
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

n₁ + n₂
n₁ + n₂ - 1
n₁ + n₂ + 1
n₁ + n₂ - 2

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Theory of Machine
Relationship between the number of links (L) and number of pairs (P) is

P = 2L - 4
P = 2L - 2
P = 2L + 2
P = 2L + 4

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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 bottom of a tooth
Pitch circle to the top of a tooth

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