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Test: Production Level - 1 - Mechanical Engineering MCQ


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25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) - Test: Production Level - 1

Test: Production Level - 1 for Mechanical Engineering 2024 is part of Mechanical Engineering SSC JE (Technical) preparation. The Test: Production Level - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Production Level - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Production Level - 1 below.
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Test: Production Level - 1 - Question 1

The following types of materials are usually the most ductile

Test: Production Level - 1 - Question 2

Pure iron is the structure of

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Test: Production Level - 1 - Question 3

Gamma iron exits at following temperature

Test: Production Level - 1 - Question 4

The crystal of alpha iron is

Detailed Solution for Test: Production Level - 1 - Question 4

The crystal of alpha iron is body centred cubic.

Explanation:

The crystal structure of a material refers to the arrangement of its atoms or ions in a repeating pattern extending in all three spatial dimensions. In the case of alpha iron (also known as ferrite), the atoms are arranged in a body-centered cubic (BCC) structure.

In a BCC structure, one atom is at the center of the cube and the other eight atoms are at the corners. This structure is efficient and compact, allowing the atoms to occupy about 68% of the total volume.

It's worth noting that iron can exist in different crystal structures depending on the temperature. At room temperature, iron is in the alpha phase and has a BCC structure. When it is heated, it transitions to the gamma phase (also known as austenite) where it has a face-centered cubic (FCC) structure. Upon further heating, it reverts back to a BCC structure in the delta phase before finally melting.

Test: Production Level - 1 - Question 5

The percentage of carbon in pig iron varies from

Detailed Solution for Test: Production Level - 1 - Question 5

Pig iron contains at least 92% Fe and has a very high carbon content, typically 3.5 - 4.5%.

Test: Production Level - 1 - Question 6

Pig iron is the name given to

Test: Production Level - 1 - Question 7

The unique property of cast iron is its high

Test: Production Level - 1 - Question 8

In grey cast iron, carbon is present in the form of

Detailed Solution for Test: Production Level - 1 - Question 8

In grey cast iron, carbon is present in the form of free carbon which takes the shape of flakes. Hence, options 2 and 3 are correct.

Grey cast iron gets its name from the grey color that is observed when the material is fractured. This grey color is due to the presence of flake graphite. Cast irons are alloys of iron and carbon, with carbon content greater than 2%. In grey cast iron, the carbon is in the form of graphite flakes which give it its characteristic grey color on the fractured surface.

The free carbon in the form of graphite makes the grey cast iron have good machinability since the graphite flakes are weak points that allow the material to break away more easily. However, this also makes grey cast iron brittle and not suitable for applications where strength and ductility are required.

Test: Production Level - 1 - Question 9

Sulphur in pig iron tends to make it

Detailed Solution for Test: Production Level - 1 - Question 9

Presence of sulfur tends to make iron hard and produces unsound castings. Wrought iron and steel produced from iron containing sulfur makes wrought iron and steel to be brittle when heated

Test: Production Level - 1 - Question 10

Iron is

Test: Production Level - 1 - Question 11

Chilled cast iron has

Test: Production Level - 1 - Question 12

'Killed steels' are those steels

Test: Production Level - 1 - Question 13

Hardness of steel depends on

Detailed Solution for Test: Production Level - 1 - Question 13

The amount of carbon in steel directly influences its hardness by forming carbides, enhancing its strength and wear resistance. Higher carbon content leads to increased hardness, as carbon atoms distort the iron lattice, hindering dislocation movement and strengthening the material. Thus, controlling carbon content is crucial in tailoring steel's mechanical properties to meet specific requirements.

Test: Production Level - 1 - Question 14

Corrosion resistance of steel is increased by addition of

Test: Production Level - 1 - Question 15

Railway rails are normally made of

Test: Production Level - 1 - Question 16

Eutectoid steel contains following percentage of carbon

Test: Production Level - 1 - Question 17

Basic constituents of Monel metal are

Test: Production Level - 1 - Question 18

German silver is an alloy of

Test: Production Level - 1 - Question 19

Solder is an alloy consisting of

Detailed Solution for Test: Production Level - 1 - Question 19

Actuallly there were two types of solder tin-lead alloy and tin copper alloy.Due restrictions in several countries only tin-copper solder is in use now.

Test: Production Level - 1 - Question 20

Cyaniding is the process of

Test: Production Level - 1 - Question 21

Weld decay is the phenomenon found with

Test: Production Level - 1 - Question 22

Carbon in iron is an example of

Test: Production Level - 1 - Question 23

Amorphous material is one

Test: Production Level - 1 - Question 24

An example of amorphous materials is

Test: Production Level - 1 - Question 25

Which of the following parameters is/are false for steel?

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