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Theory of Machine

Theory of Machine
The secondary unbalanced force is __________ the primary unbalanced force.

One-half
Two-third
n times
1/n times

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

(r/2) cosφ
r cosφ
r sinφ
r tanφ

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Theory of Machine
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

Two planes
Four planes
Three planes
A single plane

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Theory of Machine
Coriolis component is encountered in

Four bar chain mechanism
Both (A) and (C) above
Slider crank mechanism
Quick return mechanism of shaper

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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
For fluctuating loads, well suited bearing is

Needle roller bearing
Ball bearing
Roller bearing
Thrust bearing

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