Engineering Sciences
GATE XE topic:engineering-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 301–310 of 1772. Imported answers require independent review unless marked reviewed.
Question 104
Open questionXE-ENAT2 marksNeeds review
A piston-cylinder assembly having 250 mm diameter contains 0.01 kg of water vapor at 1 MPa and 200 °C. The specific volume of the vapor is 0.20602 m
/kg. The system expands as per the relation
= constant, where p is pressure and V is volume. If the final pressure is 0.35 MPa, the value of the exponent (n) is __________ (rounded off to two decimal places).Log in to check the answer
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Open questionXE-ENAT2 marksNeeds review
Air enters a air dryer at 22 °C and 100 kPa with a velocity of 3.7 m/s, and leaves the dryer at 83 °C and 100 kPa with a velocity of 9.1 m/s. The exit area of the dryer is 18.7 cm
, and the ambient temperature is 22 °C. The air is an ideal gas with gas constant
= 0.287 kJ/kg-K and isobaric specific heat
= 1.005 kJ/kg-K. If the change in potential energy is neglected, the second law efficiency (in %) of the dryer is __________ (rounded off to one decimal place).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 106
Open questionXE-ENAT2 marksNeeds review
A steam boiler contains saturated water vapour at 200 °C. After a certain period, the temperature of the boiler drops to 110 °C. Assume that all the valves of the boiler are closed and the energy is lost as heat to the surroundings. The ratio of mass of liquid to the mass of vapour is ____________ (rounded off to two decimal places).
Saturated volume of vapor phase at 200 °C = 0.127 m
/kgSaturated volume of vapor phase at 110 °C = 1.210 m
/kgSaturated volume of liquid phase at 110 °C = 0.001 m
/kgLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 107
Open questionXE-ENAT2 marksNeeds review
Two Carnot heat engines (E1 and E2) are operating in series as shown in figure. Engine E1 receives heat from a reservoir at
K and does work
. Engine E2 receives heat from an intermediate reservoir at
, does work
and rejects the rest to a reservoir at
K. Both the engines have identical thermal efficiencies.
The temperature T (in K) of the intermediate reservoir is __________ (answer in integer).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 108
Open questionXE-ENAT2 marksNeeds review
A particular temperature scale is obtained according to the relation:
where a and b are constants, and t is in °C.
The thermometric property as measured by the thermometer is
. The values of
at ice point and steam point are 6 and 9, respectively. The temperature (in °C) which gives
is __________ (rounded off to two decimal places).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 109
Open questionXE-ENAT2 marksNeeds review
In a piston cylinder assembly, one kmol of an ideal gas is compressed from an initial state of 200 kPa and 400 K to a final state of 1 MPa and 400 K. If the surroundings are at 400 K, the minimum amount of work (in kJ/kmol) required for the compression process is __________ (rounded off to two decimal places).
Use: Universal gas constant (
) = 8.314 kJ/kmol-KLog in to check the answer
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Open questionXE-FMCQ1 markNeeds review
Which one of the following measures of viscosity is dimensionless?
Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
Which one of the following permits the direct determination of intrinsic viscosity of a polymer solution for known molecular weight of the polymer?
Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
Under which combination of conditions does the glass transition of a polymer increase?
Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
In a polymer recycling plant, polymer “X” was depolymerized by glycolysis in the presence of ethylene glycol and a suitable catalyst. The glycolysis reaction yielded the following compound:
Identify the polymer “X” from the following options.
Your answerChoose one option.
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