GATE ME branch:me PYQs & Answers — Page 94

Questions 931–940 of 1040. Imported answers require independent review unless marked reviewed.

Topic practice 1040 questionsPage 94 of 104

The molar specific heat at constant volume of an ideal gas is equal to 2.5 times the universal gas constant (8.314 J/mol·K). When the temperature increases by 100 K, the change in molar specific enthalpy is __________ J/mol.

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A machine component made of a ductile material is subjected to a variable loading with

and

. If the corrected endurance limit and the yield strength for the material are

and

, respectively, the factor of safety is __________

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A heat pump absorbs 10 kW of heat from outside environment at 250 K while absorbing 15 kW of work. It delivers the heat to a room that must be kept warm at 300 K. The Coefficient of Performance (COP) of the heat pump is ______

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In a slider-crank mechanism, the lengths of the crank and the connecting rod are 100 mm and 160 mm, respectively. The crank is rotating with an angular velocity of 10 radian/s counter-clockwise. The magnitude of linear velocity (in m/s) of the piston at the instant corresponding to the configuration shown in the figure

Diagram for Mechanical Engineering question 12

is __________

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The Poisson’s ratio for a perfectly incompressible linear elastic material is

Your answerChoose one option.

0.5

infinity

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Which one of the following statements is TRUE?

Your answerChoose one option.

Both Pelton and Francis turbines are impulse turbines.

Francis turbine is a reaction turbine but Kaplan turbine is an impulse turbine.

Francis turbine is an axial-flow reaction turbine.

Kaplan turbine is an axial-flow reaction turbine.

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A particle of unit mass is moving on a plane. Its trajectory, in polar coordinates, is given by

, where

is time. The kinetic energy of the particle at time

Your answerChoose one option.

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A mass

of a perfect gas at pressure

and volume

undergoes an isothermal process. The final pressure is

and volume is

. The work done on the system is considered positive. If

is the gas constant and

is the temperature, then the work done in the process is

Your answerChoose one option.

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A motor driving a solid circular steel shaft transmits 40 kW of power at 500 rpm. If the diameter of the shaft is 40 mm, the maximum shear stress in the shaft is ______ MPa.

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If a mass of moist air contained in a closed metallic vessel is heated, then its

Your answerChoose one option.

relative humidity decreases

relative humidity increases

specific humidity increases

specific humidity decreases

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GATE ME branch:me PYQs

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