Engineering Sciences
GATE XE year:2018 PYQs
Build your understanding with focused practice from past exam papers.
Questions 121–130 of 175. Imported answers require independent review unless marked reviewed.
Question 12
Open questionXE-FMCQ2 marksNeeds review
Flexble PVC tubes are used for watering. If some organic solvents are passed through this tube, it becomes stiff. This is due to the fact that the organic solvents
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Open questionXE-FMCQ2 marksNeeds review
Match the following:
| |
|---|---|
P. Plastic egg container | 1. Injection molding |
Q. Water tank | 2. Extrusion |
R. Chair | 3. Rotational moulding |
S. Cable | 4. Thermoforming |
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Open questionXE-FMCQ2 marksNeeds review
Match the following:
| |
|---|---|
P. Flame retardant | 1. 4-Methyl-2,6-di-t-butyl phenol |
Q. UV absorber | 2. Azocarbonamide |
R. Blowing agent | 3. Phenyl salisylate |
S. Antioxidant | 4. Aluminium trihydrate |
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Open questionXE-FMCQ2 marksNeeds review
A plot of strain (%) versus time of a polymer is given below. Based on this plot and the properties as mentioned below, find out the correct combination.
1 = Viscoelastic deformation; 2 = Elastic deformation
3 = Viscoelastic recovery; 4 = Elastic recovery
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The plot shows apparent viscosity versus shear rate of Newtonian, Dilent and Pseudoplastic fluids. Based on this plot and the fluid behavior as mentioned below, find out the correct combination.
1 = Dilent fluid; 2 = Newtonian fluid; 3 = Pseudoplastic fluid
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Plot of the modulus versus temperature of different types of polymers is given below. Based on this plot and the nature of the polymers as mentioned below, find out the correct combination.
1 = An amorphous polymer of high molecular weight having entanglements
2 = An amorphous polymer of moderate molecular weight
3 = Highly crosslinked polymer
4 = Semi-crystalline polymer
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Open questionXE-FNAT2 marksNeeds review
The
of homopolymers of A and B are +100 °C and −70 °C respectively. The
of a random copolymer of A and B having 40 wt% A and 60 wt% B is _______ °C.Log in to check the answer
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Open questionXE-FNAT2 marksNeeds review
The number average molecular weight of a polymer prepared from HO(CH
)
COOH is 24,000 g/mol. The conversion of the monomer required to reach the above molecular weight is________%. (C = 12, H = 1, O = 16 g/mol).Log in to check the answer
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Open questionXE-FNAT2 marksNeeds review
Glass fibers in nylon provide reinforcement. The modulus of elasticity for each component of the composite is; E
= 10.5 x 10
psi; E
= 0.4 x 10
psi. If the nylon contains 30 % E-glass, the fraction of the applied force is carried by the glass fiber is__________. (Assume that both glass fiber and nylon have equal strain).Log in to check the answer
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Open questionXE-FNAT2 marksNeeds review
The solubility parameter of a polymer having cohesive energy density (E
) 43870 J/mol and molar volume (V) 136 cm
/mol is ________ (J/cm
)
.Log in to check the answer
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