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engineering
introduction mechanical engineering

Questions and Answers of Introduction Mechanical Engineering

What is NC machine? Explain its applications and limitations.
Explain all features of CNC machine.
Explain the programming methods used in CNC machine. Also, mention the advantages of CNC machine over NC machine.
Write notes on DNC machine. How does it differ from CNC?
Discuss CNC with its different components?
Draw a neat diagram showing the main elements of an NC machine and state the function served by each element.
How does a CNC machine differ from an NC machine?
Define Robot, write the classification based on robot physical configuration, write down the applications of an industrial robot.
Classify the robots on the basis of the physical configuration.
What is automation? Explain the types of automation with examples
The heat treatment process in which steel is heated above upper critical temperature and then cooled in air is known as:(a) Annealing(b) Normalizing(c) Austempering(d) Martempering
The heat treatment process in which steel is heated above upper critical temperature and then cooled in furnace is known as:(a) Annealing (b) Normalizing(c) Austempering (d) Martempering
In nitriding steel components, the following atmosphere is generally used in the furnace:(a) Inert(b) Nascent nitrogen(c) Liquid nitrogen(d) Ammonia
Austempering is the heat treatment process used to obtain greater:(a) Hardness (b) Toughness(c) Softness (d) Brittleness
Low carbon steel can be hardened by:(a) Hardening(b) Heating and quenching in oil(c) Heating and quenching in water(d) Carburizing and cyaniding
The hardening strains are reduced and the toughness of the part increased by the following process after hardening:(a) Annealing (b) Tempering(c) Carburizing (d) Anodizing
A small selected portion of the job can be hardened by:(a) Flame and induction hardening(b) Pack hardening(c) Cyaniding(d) Case hardening
Which of the following is a case hardening process:(a) Spherodising (b) Tempering(c) Cyaniding (d) Parkerising
Martensite is a supersaturated solution of carbon in:(a) Iron (b) Steel(c) α-iron (d) δ-iron
Martensite is a structure obtained by:(a) Quenching austenite(b) Quenching austenite and heating into the range of 200 to \(375^{\circ} \mathrm{C}\)(c) Quenching austenite and heating into the range
Troosite is the structure obtained by quenching austenite and heating at ___________ \({ }^{\circ} \mathrm{C}\).
Line \(A_{1}\) on iron-carbon diagram indicates completion of austenite transition to ___________.
Line \(\mathrm{A}_{\mathrm{cm}}\) on iron-carbon diagram indicates limit of carbon solubility in ___________.
Line \(\mathrm{A}_{3}\) on iron-carbon diagram indicates the beginning of transition fron austenite to ___________.
Eutectoid composition of carbon steel at room temperature is known as ___________ .
What is heat treatment? Discuss its importance in metallurgy.
Write the importance of FE-C diagram? Draw the diagram and explain the solubility of carbon in iron at the different temperature.
Draw the TTT diagram and explain the isothermal transformation process.
Differentiate between normalizing and annealing.
Write notes on the process and full annealing.
Differentiate between austempering and martempering.
Differentiate between hardening and tempering.
Write notes on: (i) case hardening, (ii) pack carburizing, (iii) nitriding, (iv) cyaniding, and(v) induction hardening.
What is tempering? What are its objectives?
Explain various case hardening processes of steel.
Pipes of large length and diameters are made by _____.
Felting in casting is used to _____.
The process of removal of sprue and riser from casting is known as _____.
Chills are metal inserts that are placed at appropriate location in the mold to help _____.
Core print is an added projection on the pattern and forms a seat to support and locate _____.
The maximum quantity moisture content in the molding sand can be up to _____.
Acetylene gas is produced from _____ by reacting with _____.
Thermit welding employs _____ for generating high heat.
In submerged arc welding, the metal arc is shielded by _____.
The porosity in welded metal is caused by _____.
In straight polarity, work piece is connected to _____.
In reverse polarity, work piece is connected to _____.
In D.C. arc welding, maximum heat is generated at _____.
The main function of the flux is to form _____ and protect the _____.
In arc welding, the electric arc is produced between the work and electrode by _____.
What is casting? How it differs from other primary shaping processes?
Enumerate and explain various allowances provided for pattern making.
Explain the application of various hand tools used in casting with neat sketch.
What are the various types of patterns? Explain them with their uses.
What are the required properties of molding sands? Classify the molding sand.
Explain the various types of molding sands and their uses.
Explain the advantages and disadvantages of sand casting.
Justify the statement that casting is most versatile forms of a mechanical process for producing components.
Briefly, explain hot chamber and cold chamber die casting.
What are the advantages of special casting techniques?
What purpose is served by risers in sand casting?Why they are not provided in die casting.
What are the advantages and disadvantages of die casting?
What is centrifugal casting? For what type of jobs would you recommend this casting process?Explain the process with the help of a neat sketch.
What are the casting defects? Explain the causes and remedies for these defects.
Explain the various cleaning process of castings.
Describe the working principle of arc welding.Explain the shielded arc welding. How does it save the weldment from oxidation and absorption of nitrogen? What precautions need to be observed in arc
Describe the basic fusion welding process.Explain the process details of electroslag welding.
What is the role of flux in Welding? Explain in detail.
What for Thermit welding is used.
Differentiate between neutral and oxidizing flame.
Compare the merits and demerits of using A.C.and D.C. set for arc welding.
What do you mean by arc blow problem? How can it be minimized?
Explain the soldering and brazing process.
What is gas welding? Explain with a neat sketch of welding torch and various flames.
What are the welding defects? Explain the causes and remedies.
Explain briefly about soldering.
Explain the principle of arc welding with a figure.
Name the three types of oxy-acetylene flame.Explain the application of each of them.
Differentiate between welding and brazing.
Explain electric arc welding and oxy-acetylene welding with neat sketch.
Briefly discuss the three types of flames used in gas welding and mention their applications.
In sand molding, the middle part of box is called:(a) Cope(b) Drag(c) Cheek(d) Flask-middle
Core is used to:(a) Make desired recess in casting(b) Strengthen molding sand(c) Support loose pieces(d) Remove pattern easily
Shrinkage allowance is made up by:(a) Adding to external and internal dimensions(b) Subtracting from external and internal dimensions (c) Subtracting from the external dimension and adding to the
Facing sand in foundry work comprises of:(a) Silica and clay(b) Cay and alumina(c) Silica and alumina(d) Clay and silica
The purpose of sprue is to:(a) Feed the casting at a rate consistent with the rate of solidification(b) Act as a reservoir for molten metal(c) Help in feeding the casting until the solidification
The purpose of riser is:(a) Feed the casting at a rate consistent with the rate of solidification(b) Act as a reservoir for molten metal(c) Help in feeding the casting until the solidification takes
Down sprue in casting is given a taper shape for:(a) Easy flow of molten metal(b) Easy withdrawal of casting(c) Preventing aspiration of gases through the sprue(d) Preventing bulging of sprue during
Draft on pattern is provided for:(a) The easy flow of molten metal(b) Easy withdrawal of casting(c) Preventing aspiration of gases through the sprue(d) Preventing bulging of sprue during pouring
True centrifugal casting is used to:(a) Ensure purity and density at extremities of a casting(b) Cast symmetrical object(c) Obtain high density and pure casting(d) Use heavy cast iron mold to act as
Semi-centrifugal casting is used to:(a) Ensure purity and density at extremities of a casting(b) Cast symmetrical object(c) Obtain high density and pure casting(d) Use heavy cast iron mold to act as
Surfaces to be machined are marked on the pattern by:(a) Black(b) Yellow(b) Red(d) Blue
Centrifugal method of casting is used to:(a) Ensure purity and density at extremities of a casting(b) Cast symmetrical object(c) Obtain high density and pure casting(d) Use heavy cast iron mold to
Blind risers:(a) Assist in feeding the metal into casting properly(b) Help to trap slag or other lighter particles(c) Supply the hottest metal when pouring is completed(d) Do not exist
Shift is a casting defect which:(a) Results in a mismatching of the top and bottom parts of the casting(b) Is due to enlargement of the mold cavity by metal pressure(c) Occurs near the gates as rough
Swell is a casting defect which:(a) Results in a mismatching of the top and bottom parts of the casting(b) Is due to enlargement of the mold cavity by metal pressure(c) Occurs near the gates as rough
Sand wash is a casting defect which:(a) Results in a mismatching of the top and bottom parts of the casting(b) Is due to enlargement of the mold cavity by metal pressure(c) Occurs near the gates as
Fin is a casting defect which:(a) Results in a mismatching of the top and bottom parts of the casting(b) Is due to enlargement of the mold cavity by metal pressure(c) Occurs near the gates as rough
Slag inclusion in casting is a:(a) Surface defect(b) Internal defect(c) Superficial defect(d) None of these
Felting of casting is done to:(a) Produced uniformly cooled casting(b) Remove to extra metals from casting(c) Smoothen surface (d) All of the above

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