GATE 2018 Question Paper with Answer Keys for Textile Engineering and Fibre Science (TF) - Grad Plus

# GATE 2018 Question Paper with Answer Keys for Textile Engineering and Fibre Science (TF)

Q. 1 – Q. 5 carry one mark each.

Q.1 “When she fell down the _______, she received many _______ but little help. ”The words that best fill the blanks in the above sentence are

(A) stairs, stares

(B) stairs, stairs

(C) stares, stairs

(D) stares, stares

Ans:- (A) stairs, stares

Q.2 “In spite of being warned repeatedly, he failed to correct his _________ behaviour.” The word that best fills the blank in the above sentence is

(A) rational

(B) reasonable

(C) errant

(D) good

Ans:- (C) errant

Q.3 For 0 ≤ x ≤ 2x, sin x and cos x are both decreasing functions in the interval ________.

(A) $latex \left(0,\frac\pi2\right)$

(B) $latex \left(\frac\pi2,\pi\right)$

(C) $latex \left(\pi,\frac{3\pi}2\right)$

(D) $latex \left(\frac{3\pi}2,2\pi\right)$

Ans:- (B) $latex \left(\frac\pi2,\pi\right)$

Q.4 The area of an equilateral triangle is $latex \sqrt3$. What is the perimeter of the triangle?

(A) 2

(B) 4

(C) 6

(D) 8

Ans:- (C) 6

Q.5 Arrange the following three-dimensional objects in the descending order of their volumes:

(i) A cuboid with dimensions 10 cm, 8 cm and 6 cm

(ii) A cube of side 8 cm

(iii) A cylinder with base radius 7 cm and height 7 cm

(iv) A sphere of radius 7 cm

(A) (i), (ii), (iii), (iv)

(B) (ii), (i), (iv), (iii)

(C) (iii), (ii), (i), (iv)

(D) (iv), (iii), (ii), (i)

Ans:- (D) (iv), (iii), (ii), (i)

Q. 6 – Q. 10 carry two marks each.

Q.6 An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at 60 km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey?

(A) 72

(B) 73

(C) 74

(D) 75

Ans:- (A) 72

Q.7 A set of 4 parallel lines intersect with another set of 5 parallel lines. How many parallelograms are formed?

(A) 20

(B) 48

(C) 60

(D) 72

Ans:- (C) 60

Q.8 To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 candidates. Question B was answered correctly by 2,50,000 candidates. Question C was answered correctly by 2,60,000 candidates. Both questions A and B were answered correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. If the number of students answering all questions correctly is the same as the number answering none, how many candidates failed to clear the test?

(A) 30,000

(B) 2,70,000

(C) 3,90,000

(D) 4,20,000

Ans:- (D) 4,20,000

Q.9 If x2 +x− 1 = 0 what is the value of $latex x^4+\frac1{x^4}$?

(A) 1

(B) 5

(C) 7

(D) 9

Ans:- (C) 7

Q.10 In a detailed study of annual crow births in India, it was found that there was relatively no growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another unrelated study, it was found that the revenue from cracker sales in India which remained fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. The solid line in the graph below refers to annual sale of crackers and the dashed line refers to the annual crow births in India. Choose the most appropriate inference from the above data.

(A) There is a strong correlation between crow birth and cracker sales.

(B) Cracker usage increases crow birth rate.

(C) If cracker sale declines, crow birth will decline.

(D) Increased birth rate of crows will cause an increase in the sale of crackers.

Ans:- (A) There is a strong correlation between crow birth and cracker sales.

END OF THE QUESTION PAPER

Q. 1 – Q. 25 carry one mark each.

Q.1 Let A = $latex \begin{bmatrix}a&b\\2&-b\end{bmatrix}$ and X = $latex \begin{pmatrix}-1\\1\end{pmatrix}$. If AX = $latex \begin{pmatrix}-3\\1\end{pmatrix}$, then |A| is equal to

(A) 2

(B) −2

(C) −6

(D) 6

Ans:- (D) 6

Q.2 If A and B are two independent events such that P(A) = $latex \frac14$ and P(B) = $latex \frac23$, then P(A ∪ B) is equal to

(A) $latex \frac{11}{12}$

(B) $latex \frac1{12}$

(C) $latex \frac34$

(D) $latex \frac56$

Ans:- (C) $latex \frac34$

Q.3 Which one of the following is a leaf fibre?

(A) Coir

(B) Sisal

(C) Jute

(D) Hemp

Ans:- (B) Sisal

Q.4 The pair of fibres most prone to accumulation of static charge is

(A) Cotton and Polyester

(B) Silk and Polyester

(C) Polyester and Polypropylene

(D) Silk and Polypropylene

Ans:- (C) Polyester and Polypropylene

Q.5 Heat-setting of melt-spun and drawn Nylon 6 filament yarn under slack condition leads to increase in its

(A) Tenacity

(B) Molecular orientation

(C) Molecular weight

(D) Dimensional stability

Ans:- (D) Dimensional stability

Q.6 Which one of the fibres, having stress-strain curves as shown in the figure, is the most suitable for making mountaineering ropes?

(A) P

(B) Q

(C) R

(D) S

Ans:- (C) R

Q.7 The technology that produces yarn with the maximum fibre migration is

(A) Rotor spinning

(B) Friction spinning

(C) Air-jet spinning

(D) Ring spinning

Ans:- A (or) D

Q.8 The cleaning machine, located in the fine cleaning zone of blowroom, uses the following as the opening element

(A) Roller with saw tooth wire points

(B) Drum with large spikes

(C) Roller with discs having double edged teeth

(D) Drum with large bladed discs

Ans:- (A) Roller with saw tooth wire points

Q.9 The purpose of having grooves or notches in modern flyer tops in speed frames is to

(A) Increase real twist in roving

(B) Insert false twist in roving

(C) Reduce neps in roving

(D) Increase fineness of roving

Ans:- (B) Insert false twist in roving

Q.10 With time, wind per double traverse in a drum-driven winder

(A) Increases

(B) Decreases

(C) Remains constant

(D) First increases and then decreases

Ans:- (B) Decreases

Q.11 In a loom, seven-wheel take-up motion is

(A) Negative and intermittent

(B) Negative and continuous

(C) Positive and intermittent

(D) Positive and continuous

Ans:- (C) Positive and intermittent

Q.12 The relative humidity (in %) and temperature (in $latex \textdegree C$) of standard testing atmosphere are respectively

(A) 65 and 25

(B) 65 and 20

(C) 60 and 25

(D) 60 and 20

Ans:- (B) 65 and 20

Q.13 In Stelometer, if F is the force acting on a fibre bundle and $latex \theta$ is the angle through which the pendulum is moved, then F is directly proportional to

(A) sin$latex \theta$

(B) cos$latex \theta$

(C) tan$latex \theta$

(D) cot$latex \theta$

Ans:- (A) sin$latex \theta$

Q.14 Yarn diameter varies

(A) Directly with yarn packing density

(B) Inversely with yarn packing density

(C) Directly with square root of yarn packing density

(D) Inversely with square root of yarn packing density

Ans:- (D) Inversely with square root of yarn packing density

Q.15 The constant-rate-of-extension type tensile tester is NOT used for

(A) Tongue tear test

(B) Wing rip tear test

(C) Elmendorf tear test

(D) Trapezoid tear test

Ans:- (C) Elmendorf tear test

Q.16 During bleaching of cotton with hydrogen peroxide, addition of sodium silicate

(A) Reduces the viscosity of bath

(B) Controls the rate of decomposition of perhydroxyl ions $latex \left(HO_2^-\right)$

(C) Reduces the surface tension of bath

(D) Enhances swelling of cotton

Ans:- (B) Controls the rate of decomposition of perhydroxyl ions $latex \left(HO_2^-\right)$

Q.17 In dyeing of wool with levelling acid dyes, with time, the pH of dye bath

(A) Increases

(B) Decreases

(C) Remains constant

(D) First increases and then decreases

Ans:- (A) Increases

Q.18 The discharging agent used in discharge printing of cotton with reactive dyes is

(A) Citric acid

(B) Sodium dithionite

(C) Thio-urea dioxide

(D) Sodium formaldehyde sulphoxylate

Ans:- (D) Sodium formaldehyde sulphoxylate

Q.19 Application of a fluorochemical based finish on a textile fabric imparts

P. Water repellency

Q. Oil repellency

R. Soil repellency

S. Soil release property

(A) P, Q & R only

(B) Q, R & S only

(C) P, R & S only

(D) P, Q & S only

Ans:- Marks to All

Q.20 If \overrightarrow a=-\widehat l+2\widehat{\;J},\;\overrightarrow b=-\widehat J+2\;\widehat K and \overrightarrow c=2\widehat I-\widehat k are three vectors such that \overrightarrow a+\lambda\overrightarrow{\;b} is perpendicular to\overrightarrow c , then the value of \lambda is ______________

Ans:- ‐1 to ‐1

Q.21 If y(x) is the solution of the differential equation y y′ = 8 x , y(0) = 2 , then the absolute value of y(2) is _______________

Ans:- 6 to 6

Q.22 If f(x) = $latex \left\{\begin{array}{lc}4-x,&x\leq2\\kx-4,&x>2\end{array}\right.$ is a continuous function for all real values of x , then f(8) is equal to _______________

Ans:- 20 to 20

Q.23 A twistless polyester yarn has 90 filaments, each of 2 denier. The metric count of the yarn is ______________

Ans:- 49.8 to 50.2

Q.24 Bottom shaft of a shuttle loom, weaving 2 up 1 down twill weave, is rotating at 90 rpm. The speed of cam shaft (in rpm) is ____________

Ans:- 60 to 60

Q.25 If wale constant and course constant for knitted fabrics are 4.2 and 5.46, respectively, then the value of the loop shape factor, accurate to one decimal place, is ______________

Ans:- 1.3 to 1.3

Q. 26 – Q. 55 carry two marks each.

Q.26 The cross-sectional shape of a fibre affects the following properties of yarn

P. Lustre

Q. Torsional rigidity

R. Flexural rigidity

S. Packing density

(A) P & Q only

(B) P & R only

(C) P, Q & R only

(D) P, Q, R & S

Ans:- (D) P, Q, R & S

Q.27 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

[a]: The reaction temperature and rate of agitation during polymerization of polyethylene terephthalate have an important effect on molecular weight of the polymer produced.

[r]: Polymerization of polyester by melt polycondensation is a predominantly diffusion controlled process.

(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

Ans:- (A) Both [a] and [r] are true and [r] is the correct reason for [a]

Q.28 Group I gives a list of fibres and Group II contains their applications. Match the fibre with its application.

(A) P-4, Q-2, R-3, S-1

(B) P-3, Q-4, R-2, S-1

(C) P-3, Q-4, R-1, S-2

(D) P-4, Q-1, R-2, S-3

Ans:- (B) P-3, Q-4, R-2, S-1

Q.29 Techniques used to determine the glass transition temperature of textile fibres are

P. X-ray diffraction (XRD)

Q. Differential scanning calorimetry (DSC)

R. Thermogravimetric analysis (TGA)

S. Dynamic mechanical analysis (DMA)

(A) P & Q only

(B) Q & R only

(C) Q & S only

(D) R & S only

Ans:- (C) Q & S only

Q.30 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

[a]: In a carding machine, carding type of wire point configuration is used between cylinder and doffer.

[r]: Carding type of wire point configuration gives the best fibre transfer without disturbing the fibre alignment.

(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

Ans:- (D) [a] is true but [r] is false

Q.31 Match the spinning technology listed in Group I with the machine component / function listed in Group II

(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

Ans:- (C) P-4, Q-3, R-1, S-2

Q.32 Compared to filaments in spunbonded nonwovens, those in meltblown nonwovens have

P. Lower orientation of molecular chains

Q. Higher orientation of molecular chains

R. Lower variability in diameter

S. Higher variability in diameter

(A) P & R only

(B) P & S only

(C) Q & R only

(D) Q & S only

Ans:- (B) P & S only

Q.33 Match the weave in Group I with fabric attribute in Group II.

(A) P-3, Q-4, R-2, S-1

(B) P-1, Q-4, R-2, S-3

(C) P-3, Q-4, R-1, S-2

(D) P-3, Q-1, R-2, S-4

Ans:- (A) P-3, Q-4, R-2, S-1

Q.34 Match the test in Group I with fabric property in Group II.

(A) P-1, Q-2, R-3, S-4

(B) P-1, Q-2, R-4, S-3

(C) P-2, Q-1, R-3, S-4

(D) P-2, Q-1, R-4, S-3

Ans:- (D) P-2, Q-1, R-4, S-3

Q.35 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

[a]: The work factor of silk fibre is greater than 0.5.

[r]: The work factor is calculated by assuming the following as the stress-strain curve of silk fibre.

(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

Ans:- (D) [a] is true but [r] is false

Q.36 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

[a]: As the concentration of a surfactant in water increases, the surface tension of water initially decreases and then becomes constant.

[r]: After reaching the Critical Micelle Concentration, additional surfactant molecules do not further reduce the surface tension.

(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

Ans:- (A) Both [a] and [r] are true and [r] is the correct reason for [a]

Q.37 A dye is applied on a fibre using Na2S2O4 as an auxiliary. Washing fastness of the dye on fibre is good. The correct combination of the dye and the fibre is

(A) Cationic dye, acrylic fibre

(B) Vat dye, cotton fibre

(C) Acid dye, wool fibre

(D) Reactive dye, cotton fibre

Ans:- (B) Vat dye, cotton fibre

Q.38 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

[a]: Emulsion thickener is used in pigment printing of textiles.

[r]: Emulsion thickener has high solid content.

(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

Ans:- (D) [a] is true but [r] is false

Q.39 Match the dye-fibre in Group I with the interactions in Group II.

(A) P-1, Q-2, R-4, S-3

(B) P-1, Q-2, R-3, S-4

(C) P-2, Q-1, R-4, S-3

(D) P-2, Q-1, R-3, S-4

Ans:- (C) P-2, Q-1, R-4, S-3

Q.40 Let X be a random variable following the binomial distribution. If E(X) = 2 and V ar(X) = 1.2 , then P(X = 2) , accurate to three decimal places, is equal to ____________

Ans:- 0.325 to 0.365

Q.41 The value of the integral

$latex \int_0^4\int_0^{(\sqrt{16-x^2})}y\sqrt{x^2+y^2}dydx$

is ____________

Ans:- 64 to 64

Q.42 Starting from the initial point x0 = 10, if the sequence {xn} is generated using Newton Raphson method to compute the root of the equation x4 − 600 = 0, then x2, accurate to two decimal places, is equal to _____________

Ans:- 5.95 to 6.25

Q.43 If A = $latex \begin{bmatrix}3&1\\1&3\end{bmatrix}$, then the sum of all eigenvalues of the matrix M = A2 − 4 A−1 is equal to _____________

Ans:- 17 to 17

Q.44 If the density of 100% crystalline polyethylene is 1000 kg.m-3 and that of 100% amorphous polyethylene is 865 kg.m-3, then the mass fractional crystallinity of a polyethylene  fibre with density 970 kg.m-3, accurate to two decimal places, is ___________

Ans:- 0.79 to 0.81

Q.45 In winding zone of ring spinning, the permissible minimum angle of lead is $latex 30^\circ$. For a ring of 40 mm diameter, the minimum diameter (in mm) of bobbin required is _________

Ans:- 20 to 20

Q.46 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 ___________

Ans:- 35.0 to 38.0

Q.47 An eight head comber is running at 400 nips/min. The lap fed is 60 kilotex and noil extracted is 20%. If the feed/nip is 7 mm, then with machine utilization of 80%, the production rate (in kg/h), accurate to one decimal place, is ____________

Ans:- 51.0 to 52.0

Q.48 A shuttle loom having 1.75 m reed width is running at 180 rpm. The shuttle enters and leaves the shed at $latex 120^\circ$ and $latex 240^\circ$ angular positions of crankshaft, respectively. If length of the shuttle is 0.25 m, then the mean velocity (in m/s) of the shuttle within the shed is ___________

Ans:- 18.0 to 18.2

Q.49 The diameter and length of torsion rod used in a projectile loom are increased by 5% and 20%, respectively. If the torque required to twist the rod increases by X%, then the value of X, accurate to two decimal places, is _____________

Ans:- 1.27 to 1.31

Q.50 Cloth cover factor of a square plain jammed cotton fabric, accurate to one decimal place, is _____________

Ans:- 22.8 to 23.1

Q.51 In a vibroscope, a cotton fibre of 25 mm length is clamped at one end, led over a knifeedge support, tensioned by a weight of 350 mg, and is inclined to vibrate at a fundamental resonant frequency of 2.6 kHz. The linear density of the fibre (in tex), accurate to two decimal places, is ____________

Ans:- 0.19 to 0.21

Q.52 The theoretical limit coefficient of variation (Vr in %) of the weight per unit length of cotton sliver is Vr = 106/$latex \sqrt N$, where N is the average number of fibres present in the crosssection of the sliver. To derive this expression, the coefficient of variation (in %) of the fibre weight per unit length, accurate to two decimal places, is considered as ______________

Ans:- 35.00 to 36.00

Q.53 The bending length of a nonwoven fabric in machine direction is two times the bending length in cross-machine direction. The ratio of flexural rigidities of this fabric in machine direction to cross-machine direction is ______________

Ans:- 8 to 8

Q.54 The standard deviation of population P is two times the standard deviation of population Q. The size of a random sample from population P is four times the size of a random sample from population Q. If eP and eQ denote the standard error of means of the samples from P and Q, respectively, then the ratio of eP to eQ is _____________

Ans:- 1 to 1

Q.55 A crease resist (CR) agent is applied by padding on a fabric of 1 m width and 200 g/mareal density. The concentration of CR agent in the pad bath is 100 gpl and the fabric speed is 50 m/min. The expression is 110% and the specific gravity of the pad liquor is 1.1. In order to maintain the bath concentration, the rate (in kg/min) at which the CR agent needs to be added to the bath, accurate to one decimal place, is_______________

Ans:- 0.9 to 1.1

END OF THE QUESTION PAPER

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