GATE ME topic:machine-design PYQs & Answers — Page 4

Questions 31–40 of 43. Imported answers require independent review unless marked reviewed.

Pre-tensioning of a bolted joint is used to

Your answerChoose one option.

strain harden the bolt head

decrease stiffness of the bolted joint

increase stiffness of the bolted joint

prevent yielding of the thread root

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If the wire diameter of a compressive helical spring is increased by 2%, the change in spring stiffness (in %) is ____ (correct to two decimal places).

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Fatigue life of a material for a fully reversed loading condition is estimated from

where

is the stress amplitude in MPa and

is the failure life in cycles. The maximum allowable stress amplitude (in MPa) for a life of

cycles under the same loading condition is ______ (correct to two decimal places).

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A self-aligning ball bearing has a basic dynamic load rating (

, for

revolutions) of 35 kN. If the equivalent radial load on the bearing is 45 kN, the expected life (in

revolutions) is

Your answerChoose one option.

below 0.5

0.5 to 0.8

0.8 to 1.0

above 1.0

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A bar is subjected to a combination of a steady load of 60 kN and a load fluctuating between −10 kN and 90 kN. The corrected endurance limit of the bar is 150 MPa, the yield strength of the material is 480 MPa and the ultimate strength of the material is 600 MPa. The bar cross-section is square with side a. If the factor of safety is 2, the value of a (in mm), according to the modified Goodman’s criterion, is ________ (correct to two decimal places).

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The schematic of an external drum rotating clockwise engaging with a short shoe is shown in the figure. The shoe is mounted at point Y on a rigid lever XYZ hinged at point X. A force F = 100 N is applied at the free end of the lever as shown. Given that the coefficient of friction between the shoe and the drum is 0.3, the braking torque (in Nm) applied on the drum is ______ (correct to two decimal places).

Diagram for Mechanical Engineering question 53

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A machine component made of a ductile material is subjected to a variable loading with

and

. If the corrected endurance limit and the yield strength for the material are

and

, respectively, the factor of safety is __________

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Consider the schematic of a riveted lap joint subjected to tensile load

, as shown below. Let

be the diameter of the rivets, and

be the maximum permissible tensile stress in the plates. What should be the minimum value for the thickness of the plates to guard against tensile failure of the plates? Assume the plates to be identical.

Diagram for Mechanical Engineering question 19

Your answerChoose one option.

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A helical compression spring made of a wire of circular cross-section is subjected to a compressive load. The maximum shear stress induced in the cross-section of the wire is 24 MPa. For the same compressive load, if both the wire diameter and the mean coil diameter are doubled, the maximum shear stress (in MPa) induced in the cross-section of the wire is ________.

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A steel plate, connected to a fixed channel using three identical bolts A, B and C, carries a load of 6 kN as shown in the figure. Considering the effect of direct load and moment, the magnitude of resultant shear force (in kN) on bolt C is

Diagram for Mechanical Engineering question 35

Your answerChoose one option.

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GATE ME topic:machine-design PYQs

Question 8

Question 21

Question 21

Question 32

Question 38

Question 53

Question 11

Question 19

Question 33

Question 35