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GATE preparation for Mechanical Engineering

(247 Posts)

This thread is dedicated to preparation for Mechanical Engineering - ME section of GATE. You may share questions related to topics like Heat Transfer, Thermodynamics, Design, Engineering Mathematics, Machining and Machine Tool, Mechanics, Strength of Materials, Theory of Machines, Metal Casting etc.

Question should not exceed 100 characters.Use add options for multiple choice questions and "Uploadimage/Add related data" for passage text papers.
Question should be at least 10 characters long.
Add Options | Community Guidelines
Shared from GATE - 2019 Mechanical Engineeri... on Jan 01, 2023 7:53 PM

The figure shows a pouring arrangement for casting of a metal block. Frictional losses are negligible. The acceleration due to gravity is 9.81 m/s2. The time (in s, rounded off to two decimal places) to fill up the mold cavity (of size 40 cm × 30 cm × 15 cm) is

Please type your answer before submitting.

Value of g should be substituted in cm/s^2. so it should be 981cm/s^2

Anand Limbu
Shared from GATE Mock Test - 1 (Mechanical E... on Jan 10, 2020 4:29 PM

A lot sizing policy, in which order quantity equals net requirements for the period, is known as

firm planned order
part-period method
lot-for-lot ordering
planned order receipt
Please type your answer before submitting.

Which topic this question is from

Rahul Narale
Shared from Thermodynamics - 1 (One Mark) on Oct 19, 2019 2:23 PM

A Brayton cycle has a pressure ratio of 16 : 1. This cycle produces 14 MW with an inlet state of 17oC, 100 kPa. If the heat added in the combustion is 960 kJ/kg, the highest temperature and the mass flow rate of air will be

640.37 K, 26.66 kg/s
1595.6 K, 26.66 kg/s
1595.6 K, 22.66 kg/s
640.37 K, 22.66 kg/s
Please type your answer before submitting.

B and C options are same.then why u give C is incorrect

Sree Raj
Shared from Design of Machine Elements - 3 on Aug 29, 2019 11:52 AM

A steam boiler 1.2 metres in diameter generates steam at a gauge pressure of 0.7 N/mm2. Assuming the efficiency of riveted joint as 75%, find the thickness (in mm up to one decimal place) of the shell. (Given: Factor of safety = 5, Ultimate tensile stress = 385 N/mm2)

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(Pd)/4t is the hoop stress to be considered since it is to be considered as a shell / sphere. so ans will be half of this??

Sree Raj
Shared from Machine Design - 2 on Aug 28, 2019 4:54 PM

Directions: A full journal bearing operating under a steady load has journal diameter of 60 mm and bearing length of 60 mm. Radial load on bearing is 2.8 kN and journal speed is 1020 rpm.
The radial clearance is 0.05 mm and viscosity of oil is 80 × 10–9 N–s/mm2.

What will be the power loss (in watts)?

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Use Mckeey's Eq