GATE XE format:nat PYQs & Answers — Page 58 — Exam Papers

Questions 571–580 of 668. Imported answers require independent review unless marked reviewed.

Topic practice 668 questionsPage 58 of 67

Superheated steam at 2 bar and 300 °C, with an enthalpy of 3072.1 kJ/kg, enters a horizontal adiabatic nozzle with negligible velocity and leaves at 0.2 bar as saturated vapour with an enthalpy of 2609.9 kJ/kg. Assuming steady flow and neglecting the potential energy changes, the exit velocity (in m/s) of the steam (up to 1 decimal place) is __________.

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A given mass of a simple compressible substance undergoes a reversible cycle, as shown in the P-V diagram. The magnitude of the net work done during the cycle is 3 kJ. The pressure (in bar) at point C (up to 1 decimal place) is ________.

Diagram for Engineering Sciences question 20

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One kmol of an ideal gas at 300 K and 10 bar is reversibly heated in a constant volume process to 500 K. It is then reversibly and isothermally expanded to 2 bar. Take

kJ/kmol.K and R = 8.314 kJ/kmol.K. The total heat supplied (in kJ) to the gas (up to 1 decimal place) is ________.

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A rigid container is completely filled with a liquid having a constant isothermal compressibility of

bar

and a constant coefficient of volume expansion of

K

. The liquid is initially at 300 K and 1 bar. Heat is supplied to the liquid to raise its temperature to 350 K. Assuming that no phase change occurs, the final pressure (in bar) of the liquid (up to 1 decimal place) is ________.

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The degree of polymerization of a poly(methyl methacrylate) sample having number average molecular weight of 1,50,000 g/mol is__________. (C = 12, H = 1, O = 16 g/mol).

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If the heat of fusion of 100 % crystalline polyethylene is 290 mJ/mg, a sample of polyethylene with heat of fusion of 141 mJ/mg will have _______ % crystallinity.

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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.

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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).

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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).

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The solubility parameter of a polymer having cohesive energy density (E

) 43870 J/mol and molar volume (V) 136 cm

/mol is ________ (J/cm

)

.

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