GATE ME format:msq PYQs & Answers

Questions 1–10 of 23. Imported answers require independent review unless marked reviewed.

For a fully-developed pipe flow, which of the following options is/are correct?

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

For the same maximum velocity, the average velocity is higher in the turbulent regime than that of the laminar regime

Compressibility effects are important if Mach number is less than 0.3

For laminar flow, the friction factor is independent of surface roughness

For laminar flow, friction factor decreases with decrease in Reynolds number

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Steady, compressible flow of air takes place through an adiabatic converging-diverging nozzle, as shown in the figure. For a particular value of pressure difference across the nozzle, a stationary normal shock wave forms in the diverging section of the nozzle. If

and

denote the flow conditions just upstream and downstream of the normal shock, respectively, which of the following statement(s) is/are TRUE?

Diagram for Mechanical Engineering question 40

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

Static pressure at

is lower than the static pressure at $F

Density at

is lower than the density at $F

Mach number at

is lower than the Mach number at $F

Specific entropy at

is lower than the specific entropy at $F

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Which of the following beam(s) is/are statically indeterminate?

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

Diagram for Mechanical Engineering question 41

[Beam diagram: pin support at left end, roller support near right end, with downward loads P₁ and P₂.]

Diagram for Mechanical Engineering question 41 (figure 2)

[Beam diagram: pin support at left end, roller support near right end, applied couple M at the right end.]

Diagram for Mechanical Engineering question 41 (figure 3)

[Beam diagram: pin support at left end and two roller supports near the right end, with downward loads P₁ and P₂.]

Diagram for Mechanical Engineering question 41 (figure 4)

[Beam diagram: fixed support at left end, roller support near right end, applied couple M and downward load P.]

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Two surfaces P and Q are to be joined together. In which of the given joining operation(s), there is no melting of the two surfaces P and Q for creating the joint?

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

Arc welding

Brazing

Adhesive bonding

Spot welding

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A beam is undergoing pure bending as shown in the figure. The stress (

)-strain (

) curve for the material is also given. The yield stress of the material is

. Which of the option(s) given represent(s) the bending stress distribution at cross-section AA after plastic yielding?

Diagram for Mechanical Engineering question 24

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

Diagram for Mechanical Engineering question 24 (figure 2)

Diagram for Mechanical Engineering question 24 (figure 3)

Diagram for Mechanical Engineering question 24 (figure 4)

Diagram for Mechanical Engineering question 24 (figure 5)

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In a metal casting process to manufacture parts, both patterns and moulds provide shape by dictating where the material should or should not go. Which of the option(s) given correctly describe(s) the mould and the pattern?

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

Mould walls indicate boundaries within which the molten part material is allowed, while pattern walls indicate boundaries of regions where mould material is not allowed.

Moulds can be used to make patterns.

Pattern walls indicate boundaries within which the molten part material is allowed, while mould walls indicate boundaries of regions where mould material is not allowed.

Patterns can be used to make moulds.

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The principal stresses at a point P in a solid are 70 MPa, −70 MPa and 0. The yield stress of the material is 100 MPa. Which prediction(s) about material failure at P is/are CORRECT?

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

Maximum normal stress theory predicts that the material fails

Maximum shear stress theory predicts that the material fails

Maximum normal stress theory predicts that the material does not fail

Maximum shear stress theory predicts that the material does not fail

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Which of the plot(s) shown is/are valid Mohr’s circle representations of a plane stress state in a material? (The center of each circle is indicated by O.)

Diagram for Mechanical Engineering question 27

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

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Consider a laterally insulated rod of length L and constant thermal conductivity. Assuming one-dimensional heat conduction in the rod, which of the following steady-state temperature profile(s) can occur without internal heat generation?

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

Diagram for Mechanical Engineering question 28

Diagram for Mechanical Engineering question 28 (figure 2)

Diagram for Mechanical Engineering question 28 (figure 3)

Diagram for Mechanical Engineering question 28 (figure 4)

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Cylindrical bars P and Q have identical lengths and radii, but are composed of different linear elastic materials. The Young’s modulus and coefficient of thermal expansion of Q are twice the corresponding values of P. Assume the bars to be perfectly bonded at the interface, and their weights to be negligible.

The bars are held between rigid supports as shown in the figure and the temperature is raised by

. Assume that the stress in each bar is homogeneous and uniaxial. Denote the magnitudes of stress in P and Q by

and

, respectively.

Which of the statement(s) given is/are CORRECT?

Diagram for Mechanical Engineering question 46

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

The interface between P and Q moves to the left after heating

The interface between P and Q moves to the right after heating

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GATE ME format:msq PYQs

How to practice format:msq

Question 44

Question 40

Question 41

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 46