## Theory of Machine V-belts are usually used for

None of these
Long drives
Short drives
Long and short drives

ω² r {(n + 1)/n}
ω² r {(n - 1)/n}
ω² r {n/(n + 1)}
ω² r {n/(n - 1)}

## Theory of Machine When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with decreasing amplitude
Oscillate with constant amplitude
Oscillate with increasing time period

## Theory of Machine The frequency of oscillation of a compound pendulum is

2π. √[gh/(kG² + h²)]
2π. √[(kG² + h²)/gh]
(1/2π). √[(kG² + h²)/gh]
(1/2π). √[gh/(kG² + h²)]

## Theory of Machine When two links are connected by a pin joint, their instantaneous center lies

At the center of curvature
At the pin joint
On their point of contact
At the center of circle

## Theory of Machine The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

n = 2(l - 1) - 2j
n = (l -1) - j
n = 3(l - 1) - 2j
n = 4(l - 1) - 3j