GATE ME format:msq PYQs & Answers — Page 2

Questions 11–20 of 23. Imported answers require independent review unless marked reviewed.

A very large metal plate of thickness

and thermal conductivity

is cooled by a stream of air at temperature

with a heat transfer coefficient

, as shown in the figure. The centerline temperature of the plate is

Diagram for Mechanical Engineering question 47

In which of the following case(s) can the lumped parameter model be used to study the heat transfer in the metal plate?

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Assuming the material considered in each statement is homogeneous, isotropic, linear elastic, and the deformations are in the elastic range, which one or more of the following statement(s) is/are TRUE?

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A body subjected to hydrostatic pressure has no shear stress.

If a long solid steel rod is subjected to tensile load, then its volume increases.

Maximum shear stress theory is suitable for failure analysis of brittle materials.

If a portion of a beam has zero shear force, then the corresponding portion of the elastic curve of the beam is always straight.

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A square plate is supported in four different ways (configurations (P) to (S) as shown in the figure). A couple moment

is applied on the plate. Assume all the members to be rigid and mass-less, and all joints to be frictionless. All support links of the plate are identical.

Diagram for Mechanical Engineering question 26

The square plate can remain in equilibrium in its initial state for which one or more of the following support configurations?

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Configuration (P)

Configuration (Q)

Configuration (R)

Configurations (S)

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Which of the following heat treatment processes is/are used for surface hardening of steels?

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Carburizing

Cyaniding

Annealing

Carbonitriding

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Consider sand cast of a cube of edge length

. A cylindrical riser is placed at the top of the casting. Assume solidification time,

, where

is the volume and

is the total surface area dissipating heat. If the top of the riser is insulated, which of the following radius/radii of riser is/are acceptable?

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Which of the following additive manufacturing technique(s) can use a wire as a feedstock material?

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Stereolithography

Fused deposition modeling

Selective laser sintering

Directed energy deposition processes

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Which of these processes involve(s) melting in metallic workpieces?

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Electrochemical machining

Electric discharge machining

Laser beam machining

Electron beam machining

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Which of the following methods can improve the fatigue strength of a circular mild steel (MS) shaft?

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Enhancing surface finish

Shot peening of the shaft

Increasing relative humidity

Reducing relative humidity

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The velocity field in a fluid is given to be

. Which of the following statement(s) is/are correct?

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The velocity field is one-dimensional.

The flow is incompressible.

The flow is irrotational.

The acceleration experienced by a fluid particle is zero at

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The figure shows a purely convergent nozzle with a steady, inviscid compressible flow of an ideal gas with constant thermophysical properties operating under choked condition. The exit plane shown in the figure is located in the nozzle. If the inlet pressure (

) is increased while keeping the back pressure (

) unchanged, which of the following statements is/are true?

Diagram for Mechanical Engineering question 30

Your answerSelect all correct options. You can choose more than one.

Mass flow rate through the nozzle will remain unchanged.

Mach number at the exit plane of the nozzle will remain unchanged at unity.

Mass flow rate through the nozzle will increase.

Mach number at the exit plane of the nozzle will become more than unity.

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GATE ME format:msq PYQs

Question 47

Question 26

Question 26

Question 27

Question 27

Question 28

Question 28

Question 29

Question 29

Question 30