GATE ME topic:mechanics PYQs & Answers — Page 3

Questions 21–30 of 1040. Imported answers require independent review unless marked reviewed.

A rectangular plate is perfectly welded to a gusset plate with parallel fillet weld joints as shown in the figure below. The length of the weld is

and the fillet weld leg size is

. The allowable shear strength of the weldment is

. A tensile force

is applied on the plate in a direction parallel to the length of the weld. Assuming the throat of the weld as the weakest section, the critical load is

Diagram for Mechanical Engineering question 21

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Worm gears are used for transmission rotary motion between

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non-parallel and non-intersecting shafts

intersecting shafts

parallel shafts

non-parallel and intersecting shafts

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For an ideal gas, starting from state point 1, two different process take place. The corresponding final states in these two processes are 2 and 3, lying on same isotherm. If

and

represent pressure and enthalpy, respectively, then which one of the following options is correct?

Your answerChoose one option.

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A steady incompressible laminar flow passes through a 90° tube bend placed on a horizontal surface. In horizontal diameter plane, two pressure taps

and

are provided across the cross-section at inner and outer walls of the bend, respectively. Which one of the following options is correct?

Your answerChoose one option.

is directly proportional to the bend radius.

is inversely proportional to the average flow velocity.

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An ideal gas passes isothermally through a long horizontal uniform cross-section pipe under steady flow. Consider that the pressure gradient in the pipe is sufficient for a finite change in the density of the gas. If the flow of the gas is purely pressure driven and subsonic throughout, then the average flow velocity

Your answerChoose one option.

increases along the flow

decreases along the flow

does not change throughout the pipe

increases in the hydrodynamic entrance region and then decreases thereafter

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Bernoulli’s equation CANNOT be applied between

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any two arbitrary points in the flow field for steady incompressible rotational flow

any two arbitrary points in the flow field for steady incompressible irrotational flow

any two points along a streamline for steady incompressible flow

any two points along a streamline for steady incompressible rotational flow

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A quiescent fluid at temperature

is confined between two vertical parallel plates. While plate 1 is kept at temperature

and plate 2 is maintained at temperature

, a velocity profile between the plates, as shown in the figure below, is generated due to heat transfer. Which one of the following options shows the correct relation among

, and

Diagram for Mechanical Engineering question 27

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and

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For the isothermal expansion of an ideal gas in a piston cylinder system, the net heat supplied during the process is equal to the net work. Which one of the following statements is correct for the given process?

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The process is possible.

The process is not possible as it violates the second law of thermodynamics.

The process is not possible as it violates the first law of thermodynamics.

The process is possible, however, it violates the second law of thermodynamics.

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A hydraulic crane supports a mass of 500 kg with its piston-cylinder actuator, inclined at 60° with horizontal, as shown in the figure below. The diameter of the piston is 30 cm and gravitational acceleration is 10 m/s

. Neglecting mass of the piston, the reading of the pressure gage in kPa (gage) is

Diagram for Mechanical Engineering question 29

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61.26

6.13

35.35

70.71

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In relation to metal casting defects, match the following

Defect	Description
P — Dross	I — Shallow blow found on a flat casting surface
Q — Scab	II — Lighter impurities appear on the top surface of a casting
R — Scar	III — A rough, thin layer of metal, protruding above the casting surface, on top of a thin layer of sand

Your answerChoose one option.

P–II, Q–III, R–I

P–II, Q–I, R–III

P–III, Q–I, R–II

P–III, Q–II, R–I

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GATE ME topic:mechanics PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30