ISRO Mechanical Engg. : Machine Design Quiz 3

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Question 1

A weighing m/c consists of a 2kg pan resting on a spring having liner characteristics. In this condition of resting a spring, the length of spring is 200 mm. When a 20 kg mass is placed on the pan, the length of the spring becomes 100 mm. The unreformed mm and the spring stiffness K in N/m are in mm and the spring stiffness K in N/m are

• AL = 220 and K = 1862
• BL = 200, K = 1960
• CL = 210, K = 1962
• DL = 200, k = 2

Question 2

Two metal plates of thickness and ‘w’ are joined by a fillet wield of 45 °C as shown in fig. When subjected to a pulling force “F” the stress induced in the weld will be

• A
• B
• C
• D

Question 3

Which of the following stresses are associated with the tightening of a nut on a stud?

1) Tensile stresses due to stretching of stud.

2) Bending stresses of stud.

3) Transverse shear stresses across threads.

4) Torsional shear stresses in threads due to frictional resistance.

Select the correct answer using the codes give below:

• A1, 2 and 3
• B1, 2 and 4
• C1, 3 and 4
• D2, 3 and 4

Question 4

Which thread is more suited in power screw to take load on both directions?

• AAcme thread
• BSquare thread
• CButtress thread
• DNone of these

Question 5

Which one of the following is not a friction clutch?

• ADisc or plate clutch
• BCone clutch
• CCentrifugal clutch
• DJaw clutch

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