IES-ESE Mechanical Engineering: Questions 68 - 71 of 81

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Question number: 68

» Manufacturing and Industrial Engineering » Joining » Physics of Welding

Appeared in Year: 2007

MCQ▾

Question

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?

Choices

Choice (4) Response
a.

2, 3 and 4

b.

1, 2 and 4

c.

1, 2 and 3

d.

1, 3 and 4

Question number: 69

» Manufacturing and Industrial Engineering » Joining » Physics of Welding

Appeared in Year: 1998

MCQ▾

Question

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

Choices

Choice (4) Response
a.

80 V and 300 A

b.

40 V and 300 A

c.

0 V and 150 A

d.

40 V and 150 A

Question number: 70

» Manufacturing and Industrial Engineering » Joining » Physics of Welding

Appeared in Year: 1992

MCQ▾

Question

Thick steel plate cut with oxygen normally shows signs of cracking. This tendency for cracking can be minimized by

Choices

Choice (4) Response
a.

Cutting in two or more stages

b.

Preheating the plate

c.

Using oxy-acetylene flame

d.

Slow speed cutting

Question number: 71

» Manufacturing and Industrial Engineering » Joining » Physics of Welding

Appeared in Year: 2010

Assertion-Reason▾

Assertion (Ꭺ)

Oxidizing flame is used in gas welding to join medium carbon steels having high melting point.

Reason (Ꭱ)

In gas welding, oxidizing flame produces the maximum temperature compared to neutral and reducing flame.

Choices

Choice (4) Response
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

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