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

6 Hz
3 Hz
6π Hz
3π Hz

## Theory of Machine A spring controlled governor is said to be unstable when the controlling force

Decreases as the radius of rotation increases
Increases as the radius of rotation decreases
Remains constant for all radii of rotation
Increases as the radius of rotation increases

## Theory of Machine The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

n = 3(l - 1) - 3j - h
n = 2(l - 1) - 3j - h
n = 2(l - 1) - 2j - h
n = 3(l - 1) - 2j - h

(ω₁/ω₂) y
(ω₁ × ω₂) y
(ω₁ + ω₂)/y
(ω₁ + ω₂) y

## Theory of Machine The maximum or minimum value of the swaying couple is

± 2a (1 - c) m.ω².r
± (a/√2) (1 - c) m.ω².r
± a (1 - c) m.ω².r
± c.m.ω².r