Principles of Textile Processes — Summer 2022

What is perfect drafting? Why it is not achieved in conventional draw frame.

Explain only procedure to find out transfer efficiency.

Derive an equation of yarn tension at any radius ‘r’.

Explain the importance of size pick up.

Derive an equation for sley velocity and acceleration

Explain the retardation of shuttle with hinged swell, along with necessary diagrams.

Explain foster theory of perfect drafting.

Explain the term kinematics for sley.

Discuss various factors affecting size pick up.

Discuss briefly effect of l/r ratio on type of movement to sley.

Explain the significance of fiber acceleration behind top comb.

What are the reasons of end breaks at ring frame?

Define and derive an equation for carding transfer efficiency.

Explain briefly about Alacrity of picking mechanism

Discuss briefly various aspects of weft insertion in airjet loom.

Derive an equation to calculate drafting force.

Explain interrelationship between shedding and beating.

Discuss the factors affecting drafting force.

Derive the formula for friction forces in negative let off motion also discuss design of let off mechanism.

State the configuration of fibers in card sliver.

Derive equation of winding tension (Tw) in a spinning balloon zone.

With suitable curves discuss the velocity and acceleration of projectile.

Briefly write about the factors which influence uniform acceleration during picking.

Discuss the various factors affecting the unwinding tension.

What is cylinder loading? Derive an equation to calculate cylinder loading.