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Textile Engineering Gate 2021 Questions with Answer

Ques 27 GATE 2021

A circular sheet of paper is folded along the lines in the directions shown. The paper, after being punched in the final folded state as shown and unfolded in the reverse order of folding, will look like

A

B

C

D


(a) is the correct answer.

Ques 28 GATE 2021

The process for removal of protruding fibres from fabric surface is

A

Desizing

B

Scouring

C

Souring

D

Singeing


(d) is the correct answer.

Ques 29 GATE 2021

Dimethylol dihydroxy ethylene urea (DMDHEU) is a

A

Crease-resist agent

B

Flame retardant

C

Softener

D

Soil repellent


(a) is the correct answer.

Ques 30 GATE 2021

The wet expression for a padding mangle is set at 80%. If the add-on of a flame retardant chemical required on the fabric is 2% then the concentration (g/L) of the chemical in the pad bath is


(25) is the correct answer.

Ques 31 GATE 2021

Assuming Beer-Lambert law is applicable for dilute solutions, if the molar concentration of dye in the solution is doubled then the percentage increase in absorbance would be


(100) is the correct answer.

Ques 32 GATE 2021

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: Application of an optical brightening agent makes the white fabrics appear brighter.
Reason: Optical brightening agents absorb energy in the visible region and radiate back in the UV region.

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


(d) is the correct answer.

Ques 33 GATE 2021

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: Nylon is dyed with acid dyes in the acidic medium.
Reason: Nylon assumes positive charge in the acidic medium and thus, attracts the negatively charged acid dye molecules.

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


(a) is the correct answer.

Ques 34 GATE 2021

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: Discharge printing of dyed polyester fabric is not possible.
Reason: The discharging agents damage the polyester fibres significantly.

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


(c) is the correct answer.

Ques 35 GATE 2021

A counter-flow heat exchanger is attached to a stenter for waste heat recovery.

Consider the following data:
Ambient temperature: 30 °C
Temperature of exhaust from stenter: 150 °C
Temperature of exhaust at exit of heat exchanger: 100 °C
Specific heat of exhaust: 0.42 kcal/°C/kg
Specific heat of air: 0.24 kcal/°C/kg.
At steady state, if the mass flow rates of the exhaust gas and the incoming air are the same, assuming heat loss as zero, what is the temperature (°C) of the air at the exit of the heat exchanger (towards the stenter)? (Round off to one decimal place).


(117.0 to 118.0) is the correct answer.

Ques 36 GATE 2021

Consider the following isotherms at equilibrium for two disperse dyes D1 and D2 dyed on polyester. If the partition coefficients of these are K1 and K2, respectively, what is the value of K2/K1?


(4) is the correct answer.

Ques 37 GATE 2021

The gummy substance present in raw silk fibre is

A

Serine

B

Fibroin

C

Keratin

D

Sericin


(d) is the correct answer.

Ques 38 GATE 2021

The technique used for producing viscose rayon is

A

Melt spinning

B

Wet spinning

C

Dry spinning

D

Dry-jet wet spinning


(b) is the correct answer.

Ques 39 GATE 2021

Assuming the atomic mass of H=1, C=12, N=14 and O=16, the molecular mass of a repeat unit of Nylon 6 fibre is


(113) is the correct answer.

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