Mechanical Engineering
GATE ME format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 411–420 of 599. Imported answers require independent review unless marked reviewed.
Question 9
Open questionMEMCQ1 markNeeds review
For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant cross-section, the Nusselt number at constant wall heat flux (
) and that at constant wall temperature (
) are related asYour answerChoose one option.
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Open questionMEMCQ1 markNeeds review
A two-dimensional incompressible frictionless flow field is given by
. If
is the density of the fluid, the expression for pressure gradient vector at any point in the flow field is given asYour answerChoose one option.
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As per common design practice, the three types of hydraulic turbines, in descending order of flow rate, are
Your answerChoose one option.
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Sphere 1 with a diameter of 0.1 m is completely enclosed by another sphere 2 of diameter 0.4 m. The view factor
isYour answerChoose one option.
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Open questionMEMCQ1 markNeeds review
A slender rod of length
, diameter
(
) and thermal conductivity
is joined with another rod of identical dimensions, but of thermal conductivity
, to form a composite cylindrical rod of length
. The heat transfer in radial direction and contact resistance are negligible. The effective thermal conductivity of the composite rod isYour answerChoose one option.
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Open questionMEMCQ1 markNeeds review
One-dimensional steady state heat conduction takes place through a solid whose cross-sectional area varies linearly in the direction of heat transfer. Assume there is no heat generation in the solid and the thermal conductivity of the material is constant and independent of temperature. The temperature distribution in the solid is
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Open questionMEMCQ1 markNeeds review
Consider an ideal vapor compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle?
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For a simple compressible system,
,
,
and
are specific volume, specific entropy, pressure and temperature, respectively. As per Maxwell’s relations,
is equal toYour answerChoose one option.
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In a casting process, a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mold cavity is called
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Open questionMEMCQ1 markNeeds review
Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet?
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