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Theory of Machine

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

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

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Theory of Machine
To obviate axial thrust, following gear drive is used

Double helical gears having opposite teeth
Single helical gear in which one of the teeth of helix angle a is more
Mutter gears
Double helical gears having identical teeth

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Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Ensure uniform loading
Reduce slip
Reduce vibration
Ensure proper alignment

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

ω₁.ω₂.r
(ω₁ - ω₂) r
(ω₁ - ω₂) 2r
(ω₁ + ω₂) r

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Theory of Machine
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Horizontally and perpendicular
Horizontally and parallel
Vertically and parallel
Vertically and perpendicular

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Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

At 45° to line as per (A)
Not possible to determine with these data
Perpendicular to line as per (A)
Joining the corresponding points

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