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NHPC JE’21 ME: Daily Practices Quiz. 24-Sep-2021

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NHPC-JE’21 ME: Daily Practices Quiz

NHPC-JE’21 ME: Daily Practices Quiz 24-Sep-2021

Quiz: Mechanical Engineering
Exam: NHPC JE
Topic: Welding

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. The filler material in brazing process is
(a) An alloy of Cu and Zn
(b) An alloy of Cu and Silver
(c) An alloy of Cu and Al
(d) All of the above

Q2. Weld spatter in welding is refer to
(a) Flux
(b) Welding electrode
(c) Filler material
(d) Welding defect

Q3. The principle by which the material enters into the gap between workpiece in case of soldering as well as brazing is
(a) Capillary action
(b) Cohesiveness
(c) Both
(d) None of these

Q4. In thermit welding, the thermit is the mixture of Aluminum powder and Iron oxide. where, aluminium act as
(a) Reducing agent
(b) Oxidizing agent
(c) Sometimes reducing agent and sometimes oxidizing agent
(d) None of these

Q5. In spot welding, the electrode used is
(a) Made of Al
(b) Made of Cu
(c) Made of any material
(d) Made of Tungsten carbide

Q6. A non-consumable tungsten electrode is used in TIG to generate the arc, but the material which is used to increase the thermal resistance non-consumable tungsten is
(a) Thorium
(b) Beryllium
(c) Both
(d) No such material is required

Solutions

S1. Ans. (d)
Sol. The filler material in brazing process is an alloy of Cu and Zn an alloy of Cu and Silver an alloy of Cu and Al

S2. Ans. (d)
Weld spatter is a welding defect which is present due to high welding current, too low welding speed and arc blow.

S3. Ans. (a)
Sol. The principle by which the material enters into the gap between workpiece in case of soldering as well as brazing is capillary action.

S4. Ans. (a)
Sol. In thermit welding, the thermit is the mixture of Aluminum powder and Iron oxide. where, aluminium act as reducing agent. Its use is to repair railway track and temperature generated near about 3000℃

S5. Ans. (b)
Sol. In spot welding, the electrode used is made of Cu. In this welding process indentation is produced by applying pressure and a high current in the range of 10000 Amp. is used.

S6. Ans. (c)
Sol. A non-consumable tungsten electrode is used in TIG to generate the arc, but the material which is used to increase the thermal resistance non-consumable tungsten is thorium and beryllium.

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Published by VINAYAK KUMAR

Graduated from BIT Sindri, Postgraduated from IIT BHU Varanasi

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