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Test: Cold Working, Recrystallisation, Rolling & Forging - 2


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30 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Cold Working, Recrystallisation, Rolling & Forging - 2

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 for Mechanical Engineering 2023 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Test: Cold Working, Recrystallisation, Rolling & Forging - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Cold Working, Recrystallisation, Rolling & Forging - 2 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 below.
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Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 1

For mild steel, the hot forging temperature range is 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 1

For Mild Steel, recrystallisation temp is of the order of 10000C

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 2

Assertion (A): Hot working does not produce strain hardening.
Reason (R): Hot working is done above the re-crystallization temperature. 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 3

A strip is to be rolled from a thickness of 30 mm to 15 mm using a two-high mill having rolls ofdiameter 300 mm. The coefficient of friction for unaided bite should nearly be 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 3

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 4

Assertion (A): In a two high rolling mill there is a limit to the possible reduction in thickness in one pass.
Reason (R): The reduction possible in the second pass is less than that in the first pass. 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 5

Which one of the following is an advantage of forging? 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 5

Due to grain flow in the specific direction

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 6

Consider the following statements related to forging:
1. Flash is excess material added to stock which flows around parting line.
2. Flash helps in filling of thin ribs and bosses in upper die.
3. Amount of flash depends upon forging force. 

Q.

Which of the above statements are correct?

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 6

Amount of flash depends on the forging size.

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 7

Hot rolling of mild steel is carried out 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 8

Assertion (A): There is good grain refinement in hot working.
Reason (R): In hot working physical properties are generally improved. 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 9

Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. This property is useful in obtaining products by cold rolling.
Reason (R): Plastic or permanent deformation in metal or alloy is caused by movement or dislocations. 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 10

The blank diameter used in thread rolling will be 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 10

The blank diameter used in thread rolling is equal to pitch diameter of the thread.

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 11

Assertion (A): Rolling requires high friction which increases forces and power consumption.
Reason (R): To prevent damage to the surface of the rolled products, lubricants should be used. 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 12

Match List I (Different systems) with List II (Associated terminology) and select the correct answer using the codes given below the Lists:


Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 12

 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 13

Consider the following steps involved in hammer forging a connecting rod from bar stock:
1. Blocking 2 . Trimming 3. Finishing 4. Fullering 5. Edging 

Q.

Which of the following is the correct sequence of operations?

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 14

Match List I (Forging operations) with List II (Descriptions) and select the correct answer using the codes given below the Lists:

Codes: A  B C D                     A B C  D

(a)         3  2  1  4          (b)      4  1  2  3 

(b)         3  1  2  4           (d)      4  2  1  3

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 15

In a rolling process, sheet of 25 mm thickness is rolled to 20 mm thickness. Roll is of diameter 600 mm and it rotates at 100 rpm. The roll strip contact length will be 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 15

The projected length of arc of contact, L = R sin α
And we know that

Δh = 2R (1 -cos α) or cos α = 

therefore sin α = 0.13

Therefore  L= R sin α = 300 x .013 = 39 mm

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 16

In a single pass rolling operation, a 20 mm thick plate with plate width of 100 mm, is reduced to 18 mm. The roller radius is 250 mm and rotational speed is 10 rpm. The average flow stress for the plate material is 300 MPa. The power required for the rolling operation in kWis closest to 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 17

An imaginary circle which by pure rolling action, gives the same motion as the actual gear,and is called 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 18

Consider the following operations involved in forging a hexagonal bolt from a round bar stock, whose diameter is equal to the bolt diameter:
1. Flattening 2. Upsetting 3. Swaging 4. Cambering

Q.

The correct sequence of these operations is

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 19

Match List I (Type of Forging) with List II (Operation) and select the correct answer using the code given below the Lists:  

Code: 

          A  B  C  D                              A  B  C  D

(a)      4  1  2   3                       (b)   3   2  1  4

(c)      4   2  1  3                       (d)   3  1   2  4 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 20

Assertion (A): In drop forging besides the provision for flash, provision is also to be made in the forging die for additional space called gutter.
Reason (R): The gutter helps to restrict the outward flow of metal thereby helping to fill thin ribs and bases in the upper die. 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 21

Consider the following characteristics of rolling process:

1. Shows work hardening effect
2. Surface finish is not good
3. Heavy reduction in areas can be obtained 

Q.

Which of these characteristics are associated with hot rolling?

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 22

Rolling very thin strips of mild steel requires 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 22

Rolling with smaller diagram rolls requires lower force.

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 23

A strip with a cross-section 150 mm x 4.5 mm is being rolled with 20% reduction of areausing 450 mm diameter rolls. The angle subtended by the deformation zone at the roll centre is(in radian)

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 23

Initial thickness (h1) = 4.5 mm. As width constant therefore 20% reduction in area means 20% reduction in thickness also.

Final thickness (h12 = 0.8x4.5 = 3.6 mm

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 24

Match List - I (products) with List - II (processes) and select the correct answer using the
codes given below the lists:

Codes:  A  B  C  D                     A  B  C  D

(a)         1   2  3   4         (b)        4  3  2   1

(b)         1   2  4   3         (d)        4  3  1   2

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 25

The bending force required for V-bending, U-bending and Edge-bending will be in the ratio of 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 26

Which one of the following processes is most commonly used for the forging of bolt heads of hexagonal shape? 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 27

A steel wheel of 600 mm diameter rolls on a horizontal steel rail. It carries a load of 500 N.The coefficient of rolling resistance is 0.3 mm. The force in N, necessary to roll the wheel along the rail is 

Detailed Solution for Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 27

Given : A steel wheel of 600 mm diameter rolls on a horizontal steel rail. it carries a load of 500 n. The coefficient of rolling resistance is 0.3 mm.

To find : The force in n, necessary to roll the wheel along the rail is?

Solution :

The diameter of the wheel is 600 mm

Radius of the wheel is 300 mm

The formula to find the frictional force is

Therefore, Option a is correct.

The frictional force is 0.5.

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 28

In one setting of rolls in a 3-high rolling mill, one gets 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 29

The forging defect due to hindrance to smooth flow of metal in the component called 'Lap'occurs because 

Test: Cold Working, Recrystallisation, Rolling & Forging - 2 - Question 30

Match List I (Different systems) with List II (Associated terminology) and select the correct
answer using the codes given below the Lists:

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