Straight line
Rectangle
Triangle
Parabolic curve

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

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

## Theory of Machine Which of the following statement is correct as regard to the difference between a machine and a structure?

The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
All of these
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

## Theory of Machine When the two elements of a pair have __________ when in motion, it is said to a lower pair.

None of these
Surface contact
Line or point contact
Body contact

P = W tan(φ - α)
P = W tan(α - φ)
P = W tan(α + φ)
P = W cos(α + φ)

## Theory of Machine When the sleeve of a Porter governor moves upwards, the governor speed

Decreases
Remain unaffected
Increases
First increases and then decreases