GATE ME topic:mechanics PYQs & Answers — Page 70

Questions 691–700 of 1040. Imported answers require independent review unless marked reviewed.

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 is

Your answerChoose one option.

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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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Linear

Quadratic

Logarithmic

Exponential

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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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Coefficient of performance is higher than that of the original cycle.

Coefficient of performance is lower than that of the original cycle.

Coefficient of performance is the same as that of the original cycle.

Refrigerating effect is lower than that of the original 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 to

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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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blister

spue

riser

pin hole

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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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Increasing the boiler pressure.

Decreasing the boiler pressure.

Increasing the turbine inlet temperature.

Decreasing the condenser pressure.

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Which one of the following welding methods provides the highest heat flux (W/m²)?

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Oxy-acetylene gas welding

Tungsten inert gas welding

Plasma arc welding

Laser beam welding

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Hardenability of steel is a measure of

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the ability to harden when it is cold worked

the maximum hardness that can be obtained when it is austenitized and then quenched

the depth to which required hardening is obtained when it is austenitized and then quenched

the ability to retain its hardness when it is heated to elevated temperatures

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The length, width and thickness of a steel sample are 400 mm, 40 mm and 20 mm, respectively. Its thickness needs to be uniformly reduced by 2 mm in a single pass by using horizontal slab milling. The milling cutter (diameter: 100 mm, width: 50 mm) has 20 teeth and rotates at 1200 rpm. The feed per tooth is 0.05 mm. The feed direction is along the length of the sample. If the over-travel distance is the same as the approach distance, the approach distance and time taken to complete the required machining task are

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14 mm, 18.4 s

21 mm, 28.9 s

21 mm, 39.4 s

14 mm, 21.4 s

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The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in

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viscosity

surface tension

freezing range

degree of superheat

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GATE ME topic:mechanics PYQs

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