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GATE 2021 ME : Toppers Quiz 3 (App update required to attempt this test)

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Question 1

A new multiple plate clutch disc having inner and outer diameters 100 mm and 200 mm respectively transmits power through contact surface.If the friction coefficient and permissible intensity of pressure is 0.2 and 1 MPa. Then the no. of pair of contacting surfaces if the torque carrying capacity of clutch at 750 rpm is 1.1 KN-m.

Question 2

In case of a nuclear reactor, the neutrons moving in random directions in reactor collide with each other. If the another particle is at rest, determine the velocity of the particle that struck after collision. Take u₁ = 2.2 km/hr, mass of neutron = 1.6726 x 10^-27 kg

Question 3

A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of 50 mm. The working temperature of 700 °C and the extrusion constant is 250 MPa. The force required for extrusion is

Question 4

The Demand forecast and the actual demand of an organization is provided. Determine the values of mean absolute deviation.

Question 5

Air at 20 °C flows past a 250 mm long plates at a velocity of 45 m/s. If the surface of the plate is maintained at 300 °C. Take properties of air as: k = 0.03638 W/m-K,

Pr = 0.682. The heat transferred from the entire plate length to air assuming unit width of the plate will be ____ W.

Question 6

Match list-I (Surface with orientations) with List-II (Equivalent emissivity) and select the correct answer using the codes given below the lists :
List-I
A- Infinite parallel planes
B- Body 1 completely enclosed by body 2 but body 1 is very small
C- Radiation exchange between two small gray bodies.
D- Two concentric cylinders with large lengths.
List-II
1- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image024.png$
2- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image025.png$
3- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image026.png$
4- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image027.png$

Question 7

A rigid tank contains 2.5 kg of refrigerant R-12 initially at 35°C & 170 kPa. The refrigerant is now cooled until its pressure drops to 110 kPa. The entropy change in (kJ/k) of the refrigerant during the process is –

Use the following data :

At P₁ = 170 kPa S₁ = 1.1375 kJ/kg.k

V₁ = 0.17634 m³/kg

At P₂ = 110 kPa,

[–0.68 to – 0.70]

Question 8

A child is inflating a rubber balloon to a pressure of 0.050MPa. The diameter of balloon is 300mm and thickness of rubber maybe taken as 2mm. What is the max. strain in the balloon after which it will burst? (Neglect end effects and take it to be a sphere)

Take Poisson ratio = 0.40 and E = 5MPa

Question 9

A pitot tube measures a differential pressure of 0.008 bar. What is the speed of the plane, if it is flying at a height of about 12000 m. Take density of air at this height 0.31 kg/m³

Question 10

A pressure-crank angle diagram for the SI engine is shown, which is showing different stages of combustion.

The stage BC is

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