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# GATE 2022 ME: Machine Design Revision Quiz

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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

In case of design of friction clutches, uniform rate of wear theory is used over uniform pressure. The reasons may be the following:
1) It gives higher frictional torque.
2) It gives lower frictional torque.
3) The intensity of pressure is maximum at the inner radius and minimum at the outer radius of the friction or contact surfaces.
4) This concept is prevalent for running and old clutches.
Which of the above reasons are correct?

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

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 9

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 10

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, = 600 MPa and = 400 MPa]
Assume, = 0.6 and = 0.5 .

Question 11

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 12

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 13

Match the List-1 with List-2 and select the correct answer using the codes given below (where n – factor of safety) Question 14

Square key of side ‘d/4’ each and length l is used to transmit torque ‘T’ from the shaft of diameter ‘d’ to the hub of a pulley. Assuming the length of the key to be equal to the thickness of the pulley, the average shear stress developed in the key is given by

Question 15

In a reducer gear, 5 kW input was given at the input end at a speed of 1500 rpm. If the speed reduction in this unit is 10 : 1 and efficiency is 85% then what will be the output torque (Nm)?
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