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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Mechanical Engineering MCQ

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Mechanical Engineering MCQ


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30 Questions MCQ Test - Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 below.
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Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 1
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Consider the following statements about medium carbon steel:  
1. It can be quench-hardened but not case-hardened.
2. It cannot be quench-hardened but case-hardening can be done.
3. It exhibits distinct yield point under tension test.
Which of the following statements given above are correct?

Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 1

Ans. (c) Low carbon steels (less than 0.3%C) cannot be quench hardened but case hardening can be done.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 2
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Match List I (Steel) with List II (Application) and select the correct answer using the code given below the Lists:  

Codes: A B C D                     A B C D
       (a) 2 1 4 3                 (b) 4 3 2 1
       (c) 2 3 4 1                 (d) 4 1 2 3

Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 2

Ans. (d)

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Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 3
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In case of power screws, what is the combination of materials used for the screwand the nut? I 

Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 3

Ans. (b)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 4
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Hot cracks occur in the weld and fusion zone as the metal solidifies. Which of thefollowing are the causes for hot cracks? 
1. Presence of sulphur and phosphorus in the base metal
2. High carbon or alloy content of the base metal
3. Moisture in the joint or electrode4. Joint restraint
Select the correct answer using the code given below:
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 4

Ans. (d)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 5
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Which of the following factors influence in a plain carbon steel?  
1. Percentage carbon
2. Quenching media
3. Work size
Select the correct answer using the code given below:
Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 6
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Match the terms used in connection with heat-treatment of steel with the micro structural/physical characteristics:  

Codes: A B C D                A B C D
Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 7
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A cast iron specimen in a torsion test gives a  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 7

Ans. (b) cast iron brittle fracture.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 8
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Which of the following metal shrinks most from molten state to solid state?  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 8

Admiralty metal is an alloy of not less than 70 percent copper, about 1 percent tin, small amounts of other elements, and the balance zinc; tin brass.
Admiralty metal shrinks most from molten state to solid state

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 9
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Which of the following pairs are correctly matched? 
1. Lead screw nut………… Phosphor bronze
2. Piston………….. Cast iron.
3. Cam ……………………..EN-31 steel
4. Lead screw ……..Wrought iron.
Select the correct answer using the codes given below:
Codes:
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 9

Ans. (d)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 10
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Addition of magnesium to cast iron increases its 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 10

Ans. (b)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 11
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Consider the following work materials:  
1. Titanium
2. Mild steel
3. Stainless steel
4. Grey cast iron.
The correct sequence of these materials in terms of increasing order of difficulty inmachining is
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 11

Ans. (a) Titanium high cost and need 10 times much energy than steel to produce.
Light weight, strong, corrosion resistant, properties between steel and aluminium.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 12
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Assertion (A): Machine tool beds are generally made of grey cast iron.Reason (R): Cast iron possesses good self-lubricating properties.  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 12

Ans. (a) Both A and R are true and R provides correct explanation for A.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 13
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The eutectoid of carbon in iron, above lower critical temperature, when cooled,results in:  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 13

Ans. (b)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 14
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Assertion (A): The notch sensitivity of cast iron component is zero.Reason (R): Cast iron does not have a yield point. 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 14

Ans. (a)

*Multiple options can be correct
Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 15
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Cast iron is used for machine beds because of its high 
Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 16
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Piston compression rings are made of which one of the following  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 16

Ans.(a) They are subjected to wear, to minimize they are made of wear resisting material, high quality grey cast iron casting and coated with Nitride or Chrome by PVD.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 17
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Which of the following pairs are correctly matched? 
(Designation of Steel/Cast Iron)     (Description)
1. Fe E 250                                  : Minimum tensile strength of 250 N/mm2
2. 40 C 8                                      : Percentage of Manganese is 0.7% - 0.9%
3. FG 200                                    : Grey cast iron with ultimate tensile strength of200 N/mm2
Select the correct answer using the code given below:
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 17

Ans. (c)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 18
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Vibration damping in machinery is best achieved by means of base structuresmade of which one of the following materials? 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 18

Ans. (c) Carbon is in a flake like shape as in grey cast iron; the graphite breaks up the
continuity of iron and greatly weakens it. But it also helps in absorbing vibrational energy,
as a result of which grey cast iron is normally used for the beds of machine tools.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 19
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Which one of the following cast irons consists of carbon in rosette form? 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 19

Ans. (d)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 20
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The percentage of carbon in gray cast iron is in the range of 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 20

Ans. (c)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 21
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Which of the following materials is used in the manufacture of extrusion nozzles?  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 21

Ans. (c)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 22
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Martensite is a super-saturated solution of carbon in  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 22

Ans. (a)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 23
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Increase of ferrite phase in steel increases: 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 23

Ans. (a)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 24
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Martensite is a super-saturated solution of carbon in 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 24

Ans. (a)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 25
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A given steel test specimen is studied under metallurgical microscope.Magnification used is 100 X. In that different phases are observed. One of them isFe3C. The observed phase Fe3C is also known as 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 25

Ans. (b)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 26
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Which one of the following is the correct statement? 
Pearlite in iron-carbon system is a
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 26

Ans. (b) Since the chemical separation occurs entirely within crystalline solids, the
resultant structure is a five mechanical mixture of ferrite & cementite.
Pearlite is a eutectoid mixture of ferrite and cementite.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 27
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Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 27

Ans. (b)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 28
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In a eutectic system, two elements are completely  
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 28

Ans. (b) In eutectic system, two elements are completely soluble in liquid state.

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 29
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For the pipe fitting like elbow, tee, union etc. which of the following is preferred?
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 29

Ans. (b)

Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 30
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Presence of hydrogen in steel causes 
Detailed Solution for Test: Plain Carbon Steel, Iron Carbon Equilibrium Diagram & Cast Iron - 2 - Question 30

The result of hydrogen embrittlement is that components crack and fracture at stresses less than the yield strength of the metal.

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