The welding set up is said to have straight polarity, when

Which of the following statement(s) is/are true regarding butt welding? 1. Flash butt welding is a combination of resistance, arc and pressure welding 2. Upset butt welding is used for welding rods 3. Percussion Welding is a self timing spot welding method 4. Aluminium alloys are flash welded

A

1, 2, and 3

B

Only 2 and 3

C

2, 3, and 4

D

Only 1 and 4

The welding set up is said to have straight polarity when

A

Work is connected to the positive terminal and the electrode holder to the negative terminal

B

Work is connected to the negative terminal and the electrode holder to the positive terminal

C

Work is connected to the positive terminal and the electrode holder is earthed

D

Work is connected to the negative terminal and the electrode holder is earthed

Choose the sentence (s) in which the word 'straight means 'honest or frank'. (1) Draw a straight line through the two points. (2) You are not being straight with me, even though you know that I like straight answers. (3) It was a straight choice between taking or leaving the offer of friendship.

A

(1)

B

(3)

C

(1) and (2)

D

1) and (3)

Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding

A

i and iv

B

ii and iii

C

ii and iv

D

i and iii

In the following question, two statements are given each followed by two conclusions I and II. You have to consider the statements to be true even ifthey seem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statements:
(I) Empty set is a subset of any set.
(II) A set is a subset of power set. Conclusion:
(I) Empty set is a power set.
(II) A set is a subset of power set.

A

Conclusion I follows

B

Conclusion II follows

C

Neither I nor II follows

D

Both I and II follows

Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion (a): During welding of aluminium alloys by the gas tungsten arc welding process, direct current reverse polarity (DCRP) mode is used.
Reason (r): DCRP facilitate breaking up of the oxide film on the workpiece surface.

A

a is true but r is false

B

a is false but r is true

C

both a and r are true, and r is the reason for a

D

both a and r are true, and r is not the reason for a

In a town fair 50 people were asked which dessert they liked: ice cream, Donuts, or cupcakes. 28 said they like ice cream, 26 said they like donuts, and 26 said they like cupcakes. 8 said they like all three. 17 said they like donuts and cupcakes, 11 said they like ice cream and cupcakes. 5 said they do not like any of these. Find those people who liked ice cream and donuts but not cupcakes.

A

10

B

7

C

5

D

9

E

None of the above

Consider the following statements in respect of the oxidizing flame due to excess oxygen in welding: 1) AT high temperature, it combines with many metals to form hard and brittle oxides. 2) It causes the weld bead and the surrounding area to have a scummy appearance 3) It has good welding effect in welding of copper-base metal. Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

In backhand welding, the angle between the welding rod and the work is ________ as compared to forehand welding.

A

Same

B

Less

C

More

D

None of these

In forehand welding, the angle between the welding torch and the work is ________ as compared to backhand welding.

A

Same

B

Less

C

More

D

None of these

The welding set up is said to have straight polarity, when

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