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GATE ME 2021 || Subject Revision Quiz-7

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Question 1

For the given fluctuating fatigue load, the values of stress amplitude and stress ratio are respectively _________. 

Question 2

A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is

Question 3

A spur gear is designated as
Module = 2 mm
Tooth thickness = 4 mm
Tooth length = 12 mm
Face width = 24 mm
Beam strength = 1.5 MPa
The Lewis form factor is_______.

Question 4

If the ratio of diameter of rivet hole to the pitch of rivets is 0.60 then the tearing efficiency of the joint is_____.

Question 5

If the value of Fatigue stress concentration factor (Kf) is one then the value of notch sensitivity is

Question 6

What will be the tensile yield strength if the factor of safety is taken as 2. The values of principle stresses σ1 = 35 MPa andσ2 = -115 MPa were calculated from the Mohr’s circle. Use Maximum distortion energy theory.

Question 7

A car of mass 1000 kg is moving down the hill at a slope of 1: 4 at 108 km/hr. The braking torque(in Nm) to be applied to stop the vehicle in a distance of 100 m, is _______ . Diameter of tyre is 0.5m (Neglect all the frictional energy except for the brake)

Question 8

A bracket attached to a column by means of 4 identical rivets is subjected to an eccentric force of 10 kN as shown below. Find the maximum Shear force(in N)______.

where R=Radius, all dimensions are in mm.

Question 9

The principal stresses at a point inside a solid object are σ1 = 100 MPa, σ2 = 100 MPa and σ3 = 0MPa. The yield strength of the material is 200 MPa. The factor of safety calculated using Tresca theory is nT and the factor of safety calculated using Von-Mises theory is nV. Which one of the following relations is TRUE?

Question 10

A disk clutch is required to transmit 5 kW at 2000 rpm. The disk has a friction lining with coefficient of friction equal to 0.25 and bore radius of friction lining is equal to 25 mm. assume uniform contact pressure of 1 MPa. The value of outside radius of the friction lining is:

Question 11

A carbon steel shaft 60 mm diameter is subjected to a fluctuating torque between 1500 Nm to 4000 Nm. Using Soderberg equation, the factor of safety is _________.
[Take, Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image067.png = 600 MPa and Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image068.png = 400 MPa]
Assume, Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image069.png = 0.6 Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image068.png and Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image070.png = 0.5 Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\12_Machine-Design_BLok1_files\image067.png.

Question 12

A spring having properties: G = 79.34 GPa, τ = 0.69 GPa, C = 6; is used for punching machine. The compression spring has to support 4 kN load & the diameter of wire is 13mm the number of turns in coil if the deflection under the load is 50mm

Question 13

A clutch has outer and inner diameters 80 mm and 50 mm respectively. Assuming a uniform pressure of 5 MPa and coeffiecient of friction of linear material 0.5, the torque carrying capacity of the clutch is _________.

Question 14

The figure shows an electric motor driving a machine under steady conditions by means of three straight tooth spur gears having 25, 32 and 26 teeth. The diametral pitch is 4 teeth/cm and the pressure angle is 20 °. For the direction of motor rotation shown, determine the radial load acting on the shaft carrying the idler.

Question 15

Match the List-1 with List-2 and select the correct answer using the codes given below (where n – factor of safety)
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Aug 30ESE & GATE ME