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ISRO 2018 Manufacturing Booster Quiz 4
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Question 1
The main objective of 'shot peening' is to improve which property of metal parts
Question 2
A 18 mm thick sheet is rolled with 300 mm diameter rolls to reduce thickness without any change in its width. The friction coefficient at the work-roll interface is 0.3 what is the minimum possible thickness of the sheet that can be produced in a single pass?
Question 3
If the shear strength of the work material is 350 MPa, the force required to pierce a circular hole of diameter 20 mm in a 2 mm thick mild steel plate with the help of flat-ended die and punch in a press tool is _____ kN.
Question 4
Which one of the following is a part of moulding flask?
Question 5
In a rolling operation using rolls of diameter 500 mm, if a 25 mm thick plate cannot be reduced to less than 20 mm in one Pass, the coefficient of friction between the roll and the plate is ___________
Question 6
Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as
Question 7
A cast steel slab of dimension 30×20×5 cm is poured horizontally using a side riser. The riser is cylindrical in shape with diameter and height both equal to 10 cm. The freezing ratio of the mould is _________.
Question 8
The minimum number of hot rolling passes necessary to reduce an ingot of 20 cm thickness to 10 cm thickness in rolling mill is 10. The coefficient of friction between the rolls and the hot material is assumed as 0.2. Then roll diameter is
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