IES-ESE Mechanical Engineering: Questions 68 - 71 of 81
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Question number: 68
Appeared in Year: 2007
Consider the following statements in respect of oxy-acetylene welding:
1. The joint is not heated to a state of fusion.
2. No pressure is used.
3. Oxygen is stored in steel cylinder at a pressure of 14 MPa.
4. When there is an excess of acetylene used, there is a decided change in the appearance of flame.
Which of the statements given above are correct?
2, 3 and 4
1, 2 and 4
1, 2 and 3
1, 3 and 4
Question number: 69
Appeared in Year: 1998
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 A. The generator settings for maximum arc power will be
80 V and 300 A
40 V and 300 A
0 V and 150 A
40 V and 150 A
Question number: 70
Appeared in Year: 1992
Thick steel plate cut with oxygen normally shows signs of cracking. This tendency for cracking can be minimized by
Cutting in two or more stages
Preheating the plate
Using oxy-acetylene flame
Slow speed cutting
Question number: 71
Appeared in Year: 2010
Oxidizing flame is used in gas welding to join medium carbon steels having high melting point.
In gas welding, oxidizing flame produces the maximum temperature compared to neutral and reducing flame.
|a.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|b.||Ꭺ is false but Ꭱ is true|
|c.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are false|