Production and Industrial Engineering
2022 · Paper 1
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Complete GATE PI 2022 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 46–48 of 65. Imported answers require review unless explicitly marked reviewed.
Question 46
Open questionPINAT2 marksNeeds review
A thick-cylinder has inner diameter of 20 mm and outer diameter of 40 mm. It is subjected to an internal pressure of 100 MPa. Follow the convention of taking tensile stress as positive and compressive stress as negative. The sum of radial and hoop stresses (in MPa) at a radius of 15 mm is____________. [round off to two decimal places]
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Open questionPINAT2 marksNeeds review
A shaft is used to transmit a power of 10 kW. The shear yield stress of the material is 150 MPa and factor of safety is 2. The shaft rotates at 1440 revolutions per minute. The diameter of the shaft (in mm) based on static strength is____________. [round off to two decimal places]
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Open questionPINAT2 marksNeeds review
Air at an initial temperature and pressure of 15 °C and 1 bar, respectively is heated in an irreversible process. The final temperature and pressure are 303 °C and 2 bar, respectively. Take gas constant for air as R = 287 J/kg-K, the ratio of the specific heats as γ = 1.4, and treat air as a calorically perfect gas. The change of entropy (in J/kg-K) in the process is____________. [round off to nearest integer]
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