Roving and Ring Spinning - Yarn Manufacture, Yarn Structure and Properties - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2007

During spinning of a yarn on ring frame, the yarn tension is maximum at

A

Lappet guide

B

Maximum balloon radius

C

Traveller

D

Front roller nip

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2

2007 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2007

In the context of staple fibre spinning, choose the correct statement

A

The flyer rotates faster than the bobbin in a bobbin leading speed frame

B

The traveller runs at the speed of the spindle in ring frame

C

The vortex created by jets 1 and 2 rotate in the same direction in air jet spinning

D

The peel-off point in rotor spinning rotates faster than the rotor

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3

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2008

With the use of heavier traveller

A

Spinning tension decreases

B

Yarn elongation increases

C

Yarn balloon size increases

D

Yarn hairiness decreases

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4

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2008

During winding on the ring frame

A

The downward movement of ring rail is slow and accelerating

B

The downward movement of ring rail is fast and accelerating

C

The upward movement of ring rail is slow and accelerating

D

The upward movement of ring rail is fast and accelerating

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5

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2008

The flyer leading mechanism in short staple roving frame is not used because of
P Design limitation of differential gear box
Q Energy consideration
R Slough-off problem
S Start up problem
Choose the correct combination from amongst the alternatives A, B, C and D.

A

Q, R, S

B

P, Q, R

C

P, R, S

D

P, Q, S

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6

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2008

The loss (%) in machine efficiency due to end breakage is

A

7.5

B

1.0

C

0.75

D

0.50

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7

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2008

If a spinner has the capacity to attend 36 breaks in one patrol which takes 9 minutes, the spindles to be allocated per spinner to maintain the same efficiency, will be

A

800

B

1200

C

1600

D

2000

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8

2009 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2009

The maximum practical limit of spindle speed in a commercial cotton ring frame is around

A

5000 rpm

B

10000 rpm

C

20000 rpm

D

30000 rpm

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9

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2010

Spindle speed will be

A

824 rpm

B

968 rpm

C

1016 rpm

D

1106 rpm

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10

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2010

The ideal bobbin rack speed for the first layer of roving being directly wound on the empty bobbin will be approximately

A

220 mm/min

B

240 mm/min

C

260 mm/min

D

280 mm/min

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11

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2011

Consider the statement, ‘off-setting the front top drafting roller towards the front is beneficial in a ring spinning machine’. Which one of the following CANNOT be the reason for the same?

A

It reduces the hairiness of yarn

B

It results in smooth running of top drafting roller

C

It reduces end breaks

D

It results in shorter spinning triangle

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12

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2011

The delivery rate of a roving machine is 20 m/min. Assuming the flyer speed as 1000 rpm, inner diameter of the flyer top as 1 cm, diameter of roving as 2.5 mm, and the slippage between the flyer top and roving as 50 %, the false twist (turns/m) in the roving above the flyer is ________

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13

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2011

The ring rail moves up and down in a cyclic manner during formation of a cop. The combination of events occurring during upward traverse of the ring rail is
P) Traveller speed decreases
Q) Balloon tension decreases
R) More yarn is wound by the traveller
S) Balloon tension increases

A

P, Q, S

B

P, Q, R

C

Q, R, S

D

P, R, S

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14

2013 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2013

The advantage of flyer leading over bobbin leading speed-frame is

A

Lower roving stretch

B

Lesser chance of unwinding after breakage

C

Lower power requirement

D

Power requirement remains fairly constant during the bobbin build up

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15

2013 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2013

From the following data, calculate approximate production rate in kg/hr

A

21

B

26

C

31

D

36

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16

2015 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2015

The bottom roller surface used for driving aprons in ringframe drafting system is

A

Knurled

B

Axially fluted

C

Spirally fluted

D

Smooth

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17

2016 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2016

In which region of ring spinning, Coriolis force acts?

A

Lappet to ring cop

B

Delivery pair of drafting rollers to lappet

C

Back pair of drafting rollers to delivery pair of drafting rollers

D

Feed bobbin to back pair of drafting rollers

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18

2016 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2016

The final yarn count required from a ring frame is 36s Ne with 28 TPI. The twist contraction during spinning is 3%. If the feed roving count is 2s Ne, the mechanical draft required in the ring frame will be __________

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19

2017 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2017

For a given yarn fineness, use of ring traveller of too small a mass gives

A

Small balloon size but more yarn content on the bobbin

B

Small balloon size but less yarn content on the bobbin

C

Big balloon size but more yarn content on the bobbin

D

Big balloon size but less yarn content on the bobbin

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20

2017 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Roving and Ring Spinning

Textile Engineering & Fibre Science (TF) 2017

A bobbin lead roving frame is running at 25 m/min delivery speed and 1250 rpm spindle speed. The rotational speed of the bobbin, at the instant of 0.10 m bobbin diameter, accurate to two decimal places, is__________ rpm

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