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?
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
1 Crore+ students have signed up on EduRev. Have you? Download the App |
In case of power screws, what is the combination of materials used for the screwand the nut? I
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:
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:
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
A cast iron specimen in a torsion test gives a
Which of the following metal shrinks most from molten state to solid state?
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:
Addition of magnesium to cast iron increases its
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
Assertion (A): Machine tool beds are generally made of grey cast iron.Reason (R): Cast iron possesses good self-lubricating properties.
The eutectoid of carbon in iron, above lower critical temperature, when cooled,results in:
Assertion (A): The notch sensitivity of cast iron component is zero.Reason (R): Cast iron does not have a yield point.
Cast iron is used for machine beds because of its high
Piston compression rings are made of which one of the following
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:
Vibration damping in machinery is best achieved by means of base structuresmade of which one of the following materials?
Which one of the following cast irons consists of carbon in rosette form?
The percentage of carbon in gray cast iron is in the range of
Which of the following materials is used in the manufacture of extrusion nozzles?
Martensite is a super-saturated solution of carbon in
Increase of ferrite phase in steel increases:
Martensite is a super-saturated solution of carbon in
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
Which one of the following is the correct statement?
Pearlite in iron-carbon system is a
Which one of the following sets of constituents is expected in equilibrium coolingof a hypereutectoid steel from austenitic state?
In a eutectic system, two elements are completely
For the pipe fitting like elbow, tee, union etc. which of the following is preferred?
Presence of hydrogen in steel causes
29 docs|220 tests
|
29 docs|220 tests
|