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GATE preparation for Mechanical Engineering

(244 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.
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Sree Raj
Shared from Design of Machine Elements - 3 on 29 Aug, 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)

 
6.7
8
7.3
9.2
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Sree Raj
Posted on 29 Aug, 2019 11:52 AM

(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 28 Aug, 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)?

 
174
153
186
214
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Sree Raj
Posted on 28 Aug, 2019 4:54 PM

Use Mckeey's Eq

Edugate405
Shared from GATE Mock Test - 8 (Mechanical E... on 31 Jan, 2019 5:36 PM

Blocks A and B of masses 40 kg and 60 kg, respectively are placed on a smooth surface as shown in the figure and the spring connected between them is stretched a distance 2 m . If they are released from rest, the speeds of both blocks the instant the spring becomes unstreched is (Take k = 150 N/m)

 
VA = 4 m/sec, VB = 3 m/sec
VA = 2 m/sec, VB = − 6 m/sec
VA = 2 m/sec, VB = − 3 m/sec
VA = − 3 m/sec, VB = 2 m/sec
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Edugate405
Posted on 31 Jan, 2019 5:36 PM

Correct answer is D)

Gopi
Shared from GATE Mock Test - 3 (Mechanical E... on 29 Jan, 2019 1:46 PM

The rank of a 3 x 3 matrix C = AB found by multiplying a non-zero column matrix A of size 3 x 1 and a non-zero row matrix B of size 1 x 3 is

 
1
0
2
3
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Gopi
Posted on 29 Jan, 2019 1:46 PM

Answer is 1 not zero

Edugate434
Shared from GATE Mock Test - 10 (ME) on 26 Jan, 2019 10:30 PM

A rectangular plate blocks the end of a freshwater channel as shown in the figure below.

The plate is hinged about a horizontal axis along its upper edge through a point A and is restrained from opening by a fixed ridge at point B. If the width of the plate is b, the force exerted on the plate by the ridge is

 
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Edugate434
Posted on 26 Jan, 2019 10:30 PM

Can you give explanation