ISRO 2018 Manufacturing Booster Quiz 1

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Question 1

The voltage-current characteristics of a DC generator for arc welding is a straight line between an open-circuit voltage of 80 V and short circuit current of 300 Ampere. The generator settings for the maximum arc power will be_______.

• A80 V and 150 A
• B40 V and 300 A
• C40 V and 150 A
• D80 V and 300 A

Question 2

Which of the following option are true matched?

• ARoll forming ___ Mandrel
• BBlanking ___ Shear angle
• CFlow forming ___ Coiled stock
• DAll of these

Question 3

Calculate the blank diameter to make a steel shell as shown in figure

• A226.23
• B127.56
• C22.33
• D446.25

Question 4

What maximum output current can be drawn at 100% duty cycle from a welding power source rated at 500A at 60% duty cycle _________?

• A  330.9 A
• B300 A
• C183.8 A
• D387.3 A

Question 5

Hanging mass of sand would break under its own weight. So it needs to be supported, for this purpose _______ can be used.

• AShowel
• BGaggers
• CSlick
• DSwab

Question 6

A steel sheet 1.6 mm thick and 1.2 m wide is to be bent in a die. The die radius is 3 mm and the ultimate tensile strength is 1200 MPa. The bending forces required will be _________. Take K = 0.33 for wiping die.

• A16.0 kN
• B160 MN
• C160 kN
• D0.160 kN

Question 7

In a forging operation the initial and final diameter of blank is 200 mm and 400 mm. Height is 30 mm. Find true strain?

• A-1.386
• B1.328
• C1.386
• D-1.328

Question 8

A metal disc of 90 mm diameter is to be punched from a sheet of 2 mm thickness. The punch and the dia clearance is 3% the required punch diameter is

• A79.88 mm
• B89.97 mm
• C30.06 mm
• D29.12 mm

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