ISRO 2018 Machine Design Booster Quiz 1

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Question 1

A hydraulic jack is used to compress a spring as shown in fig. stiffness of spring is N/m. By applying a pressure ‘P’ in the hydraulic cylinder, the spring gets compressed by 10 mm. The cross-sectional area of the piston is 25 . The applied pressure ‘P’ is

• A
• B40 Pascals
• C250 Pascals
• D25 Pascals

Question 2

Tension in the tight side of a belt drive is 100 N & that in the slack side is 60 N if the belt breadth is 10 cm & thickness 4 cm what is the maximum stress induced in the belt?

• A2.5 N/cm²
• B1.5 N/cm²
• C4 N/cm²
• D2 N/cm²

Question 3

A circular shaft of 100 mm diameter is welded to the support by means of circumferential fillet weld as shown below. It is subjected to torsional moment of 5000 Nm. If the permissible shear stress in the weld is limited to 140 MPa, then the size of the weld is __________ mm.

• A3.02
• B3.32
• C3.22
• D3.12

Question 4

What will be the average velocity of the chain if Sprocket rotates at speed of 1200 rpm. Also the no. of teeth on sprocket are 24. The chain has a pitch of 6.35 mm and length 1.3 m.

• A1.476 m/s
• B4.945 m/s
• C3.048 m/s
• D6.35 m/s

Question 5

Match the following Theories:

• A1-C, 2-A, 3-B
• B1-A, 2-C, 3-B
• C1-C, 2-B, 3-A
• D1-B, 2-C, 3-1

Question 6

In a typical load cycle over a component the maximum and minimum stresses of 245 N/m² and 132 N/m² are indicated respectively. Therefore the variable stress induced is _________.

• A188.5 N/m²
• B56.5 N/m²
• C113 N/m²
• D337 N/m²

Question 7

A plate clutch with inside radius of contact is 100 mm and outside radius is 200 mm, which transmits the axial force of 8000N. Assuming uniform wear, what will be the maximum and minimum pressure (in kN/m2) in the plate clutch respectively.

• A66.66 and 31.83
• B255 and 127.5
• C127.3 and 63.66
• D211.5 and 105.75

Question 8

Cotter joint is used to transmit _______.

• AAxial tensile load only
• BAxial compressive load only
• CCombined axial and twisting load only
• DAxial tensile or compressive load

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