Engineering Sciences
GATE XE topic:engineering-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 651–660 of 1772. Imported answers require independent review unless marked reviewed.
Question 104
Open questionXE-ENAT2 marksNeeds review
Consider a spark ignition engine which operates on an ideal air-standard Otto cycle. It uses a fuel which produces 44 MJ/kg of heat in the engine. If the engine requires 40 mg of fuel to produce 1 kJ of work output, then the compression ratio of the Otto cycle is ______ (rounded off to two decimal places).
For the entire cycle, use
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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 105
Open questionXE-ENAT2 marksNeeds review
A refrigerator operates on an ideal vapor compression cycle between the pressure limits of 140 kPa and 800 kPa. The working fluid is the refrigerant R-134a. The refrigerant enters the compressor as saturated vapor at 140 kPa and exits at 800 kPa and 60 °C. It leaves the condenser as a saturated liquid at 800 kPa. The coefficient of performance (COP) of the refrigerator is ______ (rounded off to two decimal places).
Use the following property data for R-134a:
At 140 kPa:
kJ/kg,
kJ/kgAt 800 kPa:
kJ/kg,
kJ/kgAt 800 kPa and 60 °C:
kJ/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 106
Open questionXE-ENAT2 marksNeeds review
A steam power plant operates on a simple ideal Rankine cycle. The condenser pressure is 10 kPa and the boiler pressure is 5 MPa. The steam enters the turbine at 600 °C. Mass flow rate of the steam is 50 kg/s. Neglecting the pump work, the net power output of the plant is ______ MW (rounded off to one decimal place).
Use the following property data for water:
At 10 kPa:
kJ/kg,
kJ/kg,
kJ/kg
kJ/kg-K,
kJ/kg-K,
kJ/kg-KAt 5 MPa and 600 °C:
kJ/kg,
kJ/kg-KLog 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
In an air-conditioning system, air enters at 20 °C and 30% relative humidity at a steady rate of 30 m
/min in a humidifier and it is conditioned to 25 °C and 60% relative humidity. Assuming entire process takes place at pressure of 100 kPa, the mass flow rate of the steam added to air in the humidifier is ______ kg/min (rounded off to three decimal places).Use the following property data:
At 20 °C and 25 °C, saturation pressures of water are 2.3392 kPa and 3.1698 kPa, respectively.
For air,
kJ/kg-KLog 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 108
Open questionXE-ENAT2 marksNeeds review
An office uses a heat pump to receive 500 kJ/day heat in winter to maintain its temperature at 300 K. The ambient temperature is 280 K. If the COP of the heat pump is 60% of its theoretical maximum value, the ratio of actual work input to the minimum theoretical work input to the heat pump is ______ (rounded off to one decimal place).
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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 109
Open questionXE-ENAT2 marksNeeds review
In a liquid-vapor phase change process,
at 100 °C for saturated water is 370 Pa/K. If the resulting change in specific volume
is 1.672 m
/kg, the enthalpy of vaporization (
) will be ______ kJ/kg (in integer).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 110
Open questionXE-FMCQ1 markNeeds review
Which one of the monomers given is used in the synthesis of cellulose?
Your answerChoose one option.
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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 111
Open questionXE-FMCQ1 markNeeds review
A copper wire upon loading instantaneously increases in length to l, and then continues to elongate gradually. Upon unloading, the wire retracts to length l. According to the Maxwell model, which one of the options given correctly relates the total strain E, the applied stress S, the modulus G, the material’s resistance to flow η, and the elapsed time t between loading and unloading?
Your answerChoose one option.
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Open questionXE-FMCQ1 markNeeds review
Consider the structure of a crosslinked polymer shown in the figure. From the options given, identify the monomers that are used in the synthesis of the polymer.
Your answerChoose one option.
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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 113
Open questionXE-FMCQ1 markNeeds review
Among the options given, choose the most suitable compatibilizer for blending Polyvinylidene fluoride (PVDF) and Acrylonitrile butadiene styrene (ABS).
Your answerChoose one option.
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