GATE ME format:nat PYQs & Answers — Page 32 — Exam Papers

Questions 311–320 of 418. Imported answers require independent review unless marked reviewed.

Topic practice 418 questionsPage 32 of 42

Fatigue life of a material for a fully reversed loading condition is estimated from

where

is the stress amplitude in MPa and

is the failure life in cycles. The maximum allowable stress amplitude (in MPa) for a life of

cycles under the same loading condition is ______ (correct to two decimal places).

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A flat plate of width L = 1 m is pushed down with a velocity U = 0.01 m/s towards a wall resulting in the drainage of the fluid between the plate and the wall as shown in the figure. Assume two-dimensional incompressible flow and that the plate remains parallel to the wall. The average velocity, u_ of the fluid (in m/s) draining out at the instant shown in the figure is __________(correct to three decimal places).

Diagram for Mechanical Engineering question 22

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The viscous laminar flow of air over a flat plate results in the formation of a boundary layer. The boundary layer thickness at the end of the plate of length L is

. When the plate length is increased to twice its original length, the percentage change in laminar boundary layer thickness at the end of the plate (with respect to

) is ________ (correct to two decimal places).

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An ideal gas undergoes a process from state 1 (T₁ = 300 K, p₁ = 100 kPa) to state 2 (T₂ = 600 K, p₂ = 500 kPa). The specific heats of the ideal gas are: cₚ = 1 kJ/kg-K and cᵥ = 0.7 kJ/kg-K. The change in specific entropy of the ideal gas from state 1 to state 2 (in kJ/kg-K) is __________(correct to two decimal places).

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An engine operates on the reversible cycle as shown in the figure. The work output from the engine (in kJ/cycle) is ______ (correct to two decimal places).

Diagram for Mechanical Engineering question 23

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For a Pelton wheel with a given water jet velocity, the maximum output power from the Pelton wheel is obtained when the ratio of the bucket speed to the water jet speed is ______ (correct to two decimal places).

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The arrival of customers over fixed time intervals in a bank follow a Poisson distribution with an average of 30 customers/hour. The probability that the time between successive customer arrival is between 1 and 3 minutes is ______ (correct to two decimal places).

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The height (in mm) for a 125 mm sine bar to measure a taper of 27° 32′ on a flat work piece is ______ (correct to three decimal places).

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A ball is dropped from rest from a height of 1 m in a frictionless tube as shown in the figure. If the tube profile is approximated by two straight lines (ignoring the curved portion), the total distance travelled (in m) by the ball is ________ (correct to two decimal places).

Diagram for Mechanical Engineering question 25

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The percentage scrap in a sheet metal blanking operation of a continuous strip of sheet metal as shown in the figure is ______ (correct to two decimal places).

Diagram for Mechanical Engineering question 36

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