## Theory of Machine Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

π (r₁ + r₂) + (r₁ - r₂)²/x + 2x
π (r₁ + r₂) + (r₁ + r₂)²/x + 2x
π (r₁ - r₂) + (r₁ - r₂)²/x + 2x
π (r₁ - r₂) + (r₁ + r₂)²/x + 2x

## Theory of Machine The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is

(1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3). μ W cosecα (r₁ + r₂)
(1/2). μ W cosecα (r₁ + r₂)
(2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]

## Theory of Machine In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

Equal to sum of other two
Less than sum of other two
Greater than sum of other two
There is no such relationship

Zero
Maximum
Minimum
None of these

## Theory of Machine In a mechanism, the fixed instantaneous centers are those centers which

Moves as the mechanism moves, but joints are of permanent nature
None of the listed here
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism

## Theory of Machine The centre of gravity of a coupler link in a four bar mechanism will experience

Both linear and angular acceleration
Only angular acceleration
Only linear acceleration
No acceleration