Gate Yearwise 

Textile Engineering Gate 2020 Questions with Answer

Ques 27 GATE 2020

Bio-polishing of cotton fabrics is done using

A

Cellulase

B

Amylase

C

Proteinase

D

Esterase


(a) is the correct answer.

Ques 28 GATE 2020

A padding mangle is processing a fabric at 1320 m/h. The bottom bowl of the mangle is rotating at 25 rpm. Assuming zero slippage at the nip, the diameter (cm) of this bowl is ________.


(28.00 to 29.00) is the correct answer.

Ques 29 GATE 2020

A Procion H (monochlorotriazine based) reactive dye used for printing of cotton has a molecular weight of 471. Taking the atomic weight of H=1, C=12, N=14, O=16, Cl=35.5, the molecular weight of the fully hydrolyzed dye (correct up to 1 decimal place) would be _______.


(452.5) is the correct answer.

Ques 30 GATE 2020

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
[a]: Sodium chlorite is a bleaching agent for cotton.
[r]: Sodium chlorite is an effective reducing agent.

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


(d) is the correct answer.

Ques 31 GATE 2020

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
[a]: Acrylic fibres are dyed with basic dyes in acidic medium.
[r]: In acidic medium the acrylic fibre acquires positive charge.

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


(d) is the correct answer.

Ques 32 GATE 2020

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
[a]: Foam finishing significantly reduces the energy consumed in drying.
[r]: The specific heat of air is significantly lower than that of water.

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


(b) is the correct answer.

Ques 33 GATE 2020

Given that one gram mole of a gas occupies 22.4 L of volume at STP, the atomic weights of H=1, and that of O=16, the concentration (g/L) of hydrogen peroxide solution of 25 volume strength (rounded off to 2 decimal places) is __________.


(75.00 to 77.00) is the correct answer.

Ques 34 GATE 2020

The work of adhesion (WSL) depends on the surface tension (γLV) of the liquid and the contact angle (θ) formed on a surface and is expressed as γLV(1 + cos θ). 1 The WSL for a given fabric and a liquid is reduced to 1/3rd of the original value after oil repellent treatment. If the measured contact angle of the untreated fabric is 60°, what is the percent change in the contact angle after the treatment?


(100) is the correct answer.

Ques 35 GATE 2020

In wool, the sulfur containing amino acid is

A

Alanine

B

Cystine

C

Glycine

D

Serine


(b) is the correct answer.

Ques 36 GATE 2020

Viscose rayon is soluble in

A

Acetone

B

Chloroform

C

Formic acid 85% (v/v)

D

Sulfuric acid 59% (W/W)


(d) is the correct answer.

Ques 37 GATE 2020

A polypropylene filament is drawn in two stages with draw ratios of 1.5 and 2 respectively. The overall draw ratio is _______.


(3) is the correct answer.

Ques 38 GATE 2020

The refractive indices of a filament in axial and radial directions are 1.58 and 1.52 respectively. The birefringence of the filament (correct up to 2 decimal places) is ________.


(0.06) is the correct answer.

Ques 39 GATE 2020

In melt spinning of poly(ethylene terephthalate), pre-drying of polymer chips is essential to avoid

A

Hydrolytic degradation

B

Oxidative degradation

C

Microbial degradation

D

Photo-induced degradation


(a) is the correct answer.

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