Rotor, Air-Jet and Other Spinning Systems - 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 · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2007

Quenching of textile grade POY polyester multi-filaments in the melt spinning process is typically achieved by

A

Inflow of air

B

Outflow of air

C

Cross flow of air

D

Water spray

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2

2007 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2007

Out of the following spinning systems, in which case the fibres get decelerated as they travel from feed to yarn formation point

A

Ring spinning

B

Parafil spinning

C

Air-jet spinning

D

Friction spinning

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3

2007 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2007

A 46 mm diameter rotor is spinning 60 tex yarn at 100 m/min. The trash level in feed sliver is 0.2%. The opening roller can clean the sliver to the extent of 70%. The self cleaning effect of the yarn arm within the rotor is 50%
Trash deposition (mg/cm of rotor circumference) after 1 min will be

A

0.1245

B

0.1320

C

0.1420

D

0.1485

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4

2007 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2007

If an interruption in spinning is expected once the deposition attains 0.2 mg/cm in the rotor groove, number of end breaks expected in 8 hours is

A

260

B

290

C

299

D

312

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5

2008 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2008

In melt spinning process, die-swell can be reduced by

A

Decreasing the temperature of melt

B

Increasing the molecular weight of the polymer

C

Decreasing the L/D ratio for a given diameter

D

Increasing the temperature of melt

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6

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2010

The rotor spun yarn has better uniformity than the ring spun yarn of same count and fibres. The reason is

A

The high production rate of rotor spinning system

B

The fibre doubling occurring inside the rotor

C

The presence of wrapper fibres in rotor spun yarns

D

In rotor spinning, twisting and winding are separated

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7

2010 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2010

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]
Assertion: The spinning speed in melt spinning process are higher than that of wet spinning process
Reason: The solidification of melt involves only heat transfer, whereas in wet spinning one way mass transfer is also involved.

A

Both [a] and [r] are true and [r] is the correct reason for [a]

B

Both [a] and [r] are true and [r] is not the correct reason for [a]

C

Both [a] and [r] are false

D

[a] is true but [r] is false

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8

2011 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2011

For a given yarn count made from the same fibre, rotor spun yarn is bulkier than ring spun yarn, because

A

Rotor spun yarn is more even than ring spun yarn

B

Navel tube peels off the fibres from rotor spun yarn surface

C

Rotor spun yarn has large number of wrapper fibres

D

Yarn tension in rotor spinning is lower as compared to that in ring spinning

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9

2013 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2013

Compared to the spinning of finer cotton yarns, the preferred rotor diameter for the production of very coarse cotton yarns would

A

Be higher

B

Be lower

C

Remain the same

D

Change depending on fibre strength

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10

2013 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2013

Amongst the following, the suitable technology for producing core spun yarn is

A

Air vortex spinning

B

Rotor spinning

C

Friction spinning

D

Air-jet spinning

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11

2014 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2014

For producing a coarse count yarn from short staple trashy cotton sliver, the most suitable rotor is

A

Large diameter rotor with narrow groove

B

Large diameter rotor with wide groove

C

Small diameter rotor with narrow groove

D

Small diameter rotor with wide groove

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12

2015 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2015

A rotor of 2 inch diameter is spinning a yarn of 16^s Ne. If the twist multiplier is 5 and the fibre linear density is 0.1 tex, the average fibre flow through the transport channel, to the nearest integer, will be __________

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13

2016 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2016

Match the fibre in Column A with the spinning technique used to manufacture in Column B. Choose the correct alternative from options A, B, C and D.

A

P-3,Q-1,R-2,S-4

B

P-1,Q-3,R-4,S-2

C

P-4,Q-2,R-1,S-3

D

P-4,Q-1,R-2,S-3

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14

2016 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2016

A rotor with 48 mm diameter running at 90,000 rpm is producing yarn at 140 m/min. The number of doublings of fibre layers in the rotor is __________

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15

2016 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2016

Consider the following assertion [a] and reason [r] and choose the correct alternative from amongst A, B, C and D.
[a] Compared to ring spun yarns, rotor spun yarns have better evenness for the same yarn count.
[r] Rotor spun yarns have more number of fibres in the yarn cross section compared to ring spun yarns of same count.

A

[a] is right and [r] is wrong

B

[a] is right and [r] is right

C

[a] is wrong and [r] is wrong

D

[a] is wrong and [r] is right

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16

2017 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2017

A 30 tex open-end rotor yarn having 650 twist per meter is produced using 33 mm rotor diameter and 1,20,000 rotor rpm. The rotational speed of the peel-off point is__________ × 10³ rpm

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17

2018 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2018

Match the spinning technology listed in Group I with the machine component / function listed in Group II.

Group I	Group II
P. Wrap spinning	1. False twisting
Q. Rotor spinning	2. Perforated drums
R. Air-jet spinning	3. Back doubling
S. DREF II friction spinning	4. Hollow spindle

A

P-3, Q-4, R-2, S-1

B

P-4, Q-1, R-3, S-2

C

P-4, Q-3, R-1, S-2

D

P-3, Q-1, R-2, S-4

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18

2018 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2018

A sliver of 4.2 kilotex is fed in a rotor spinning machine with opening zone draft of 1400. The draft in the transport duct is 5 and the sliding draft on the rotor wall till the rotor groove is 2. If the total back doubling within the rotor is 120, then the linear density (in tex) of the output yarn is ______

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19

2019 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2019

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]
[a] : The short term mass irregularity of rotor yarn is less than that of ring yarn.
[r] : Rotor yarn has belt or wrapper fibres, but ring yarn does not.

A

Both [a] and [r] are true and [r] is the correct reason for [a]

B

Both [a] and [r] are true but [r] is not the correct reason for [a]

C

Both [a] and [r] are false

D

[a] is true but [r] is false

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20

2020 · Textile Engineering & Fibre Science · Yarn Manufacture, Yarn Structure and Properties · Rotor, Air-Jet and Other Spinning Systems

Textile Engineering & Fibre Science (TF) 2020

The spinning system in which one revolution of twisting element imparts several turns to the fibre strand is

A

Ring

B

Rotor

C

Friction

D

Wrap

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