## Theory of Machine The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

Perpendicular to each other
Inclined at 45°
Parallel to each other
Opposite to each other

## Theory of Machine Inertia force acts

Opposite to the direction of acceleration force
None of the listed here
Along the direction of acceleration force
Perpendicular to the acceleration force

## Theory of Machine A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

Become equal to R/2
Become equal to 2R
Become equal to R/4
Remain same as before

## Theory of Machine Coriolis component acts

None of these
Perpendicular to sliding surfaces
Somewhere in between above two
Along sliding surfaces

## Theory of Machine Higher pairs are those which have

Two elements that permit relative motion
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically

α = 90° - φ
α = 45° + φ/2
α = 45° - φ/2
α = 90° + φ