GATE XE kind:question PYQs & Answers — Page 101

Questions 1001–1010 of 1772. Imported answers require independent review unless marked reviewed.

Air at a pressure of 1 MPa and 300 K is flowing in a pipe. An insulated evacuated rigid tank is connected to this pipe through an insulated valve. The volume of the tank is 1 m³. The valve is opened and the tank is filled with air until the pressure in the tank is 1 MPa. Subsequently, the valve is closed. Consider air to be an ideal gas and neglect bulk kinetic and potential energy. The final temperature of air in the tank is __________ K (1 decimal place).

Specific heat capacity of air at constant pressure

kJ/(kgK) and characteristic gas constant for air = 0.287 kJ/(kgK)

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A cylinder of volume 0.1 m³ is filled with 100 mol of propane (C₃H₈) at 2 MPa. If propane is assumed to obey the van der Waals equation of state, then its temperature is ______ K (1 decimal place).

The van der Waals constants for propane are: a = 939.2 kPa (m³/kmol)² and b = 0.095 m³/kmol. The universal gas constant is 8.3145 J/(mol K).

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A frictionless piston cylinder device contains 1 kg of an ideal gas. The gas is compressed according to Pv¹·³ = constant (P is pressure and v is mass specific volume), from 100 kPa, 250 K, till it reaches a temperature of 500 K. The heat transfer from the piston cylinder device to its surroundings is __________ kJ (2 decimal places).

The characteristic gas constant is 287 J/(kg K) and the ratio of specific heat capacities is 1.4.

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A 0.8 m³ insulated rigid tank contains 1.5 kg of an ideal gas at 100 kPa. Electric work is done on the system until the pressure in the tank rises to 135 kPa. The loss in availability (exergy) associated with the process is __________ kJ (2 decimal places).

For the ideal gas, the characteristic gas constant is 188.9 J/(kg K) and the specific heat capacity at constant volume is 680 J/(kg K). The temperature of the dead state is 298 K.

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A rigid tank contains 1.0 kg of pure water consisting of liquid and vapour phases in equilibrium at 10 bar. If the liquid and vapour phase each occupies one half of the volume of the tank, then the net enthalpy of the contents of the tank is ______ kJ (1 decimal place).

For saturated liquid and vapour at 10 bar, the thermodynamic data table provides the following value:

v_f = 1.127 × 10⁻³ m³/kg, v_g = 194.3 × 10⁻³ m³/kg, h_f = 762.6 kJ/kg, h_g = 2776.2 kJ/kg

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An air-standard Diesel cycle with a compression ratio of 16 takes air at 1 bar and 300 K. If the maximum temperature in the cycle is 2100 K, then the thermal efficiency of the cycle is ______ % (1 decimal place). The ratio of the specific heat capacities of air is 1.4.

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Linear low density polyethylene (LLDPE) is a copolymer of ethylene and a small fraction of ________.

Your answerChoose one option.

butadiene

isoprene

butene

hexadiene

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Binary polymer blends of polypropylene and polyamide 6 are immiscible. From a thermodynamic viewpoint this is due to ________.

Your answerChoose one option.

low enthalpy of mixing

high entropy of mixing

high enthalpy of mixing

low entropy of mixing

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Which one of the following is an elastomer?

Your answerChoose one option.

Polyamide 6,6

Poly (ethylene terephthalate)

Vulcanized polybutadiene

High density polyethylene

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Compression moulded isotropic polypropylene film exhibits __________ in X-ray diffraction analysis.

Your answerChoose one option.

spot pattern

circular ring pattern

circular ring and spot pattern

arc pattern

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GATE XE kind:question PYQs

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 1

Question 2

Question 3

Question 4