Manufacturing Technology 1 Lab Viva Questions and answers
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We have added Manufacturing Technology 1 Lab Viva Questions and Answers for the diploma mechanical II year / III Semester as PDF
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Machine Drawing and CAD Practical VIVA questions and answers – click here
Measurements and Metrology Practical VIVA Questions and answers – Click here
1.What is a lathe?
Lathe is a machine, which removes the metal from a piece of work to the required shape &size
2.What is the various operations can be performed on a lathe?
- Facing
- Turning
- Forming
- Knurling
- Chamfering
- Thread Cutting
- Drilling
3.What are principle parts of the lathe?
Headstock, tailstock, carriage, crossslide, toolpost
- What is an apron?
The integral part of several gears, levers clutches mounted with the saddle for moving the garriage along with lead screw while thread cutting
- List any four holding devices?
Chucks
Centers
Face plate
Angle plate
6. What is the function of Hand riddle?
Used for hand riddling of sand to remove foreign material from it.
- What is a Rammer?
Rammers are used for striking the sand mass in the moulding box to pack it uniformly around the pattern.
- Give the classification of Rammer.
Peen rammer
2. Hand rammer
3. Floor rammer
9. What is the use of Vent wire in foundry?
It is a thin steel rod. After ramming and striking off the excess sand it is used to make small holes, called vents, in the sand mould to allow the exit of gases and steam during casting
- What are Slicks?
They are used for repairing & finishing the mould surfaces & edges after
- Mention the material of moulding boxes.
Made of Wood, Cast iron or steel.
- List the characteristics of Foundry sand.
1. Refractoriness,
2. Permeaability,
3. Flowability or plasticity
4. Adhesiveness
5. Cohesiveness
6. Collapsibility
13.Explain Refractoriness of foundry sand?
It is that property of the moulding sand which enables it to withstand high temperatures of the molten metal without using thus facilitating a clean casting.
- Define Permeability of foundry sand.
It is also termed as porosity. It is the property of the sand which allows the gases and steam to escape through the sand mould.
- What is Adhesiveness of foundry sand?
It is that property of the sand due to which it is capable of adhering to the surfaces of other materials.
- What is Green sand?
It is also known as tempered sand. Which contains just enough moisture to give it sufficient bond. Moulds in this sand are known as green sand moulds.
- What is Parting sand?
This sand is sprinkled on the pattern and the parting surfaces of the mould so that the sand mass of one flask does not stick to that of the other or the pattern
- Define welding
Welding is the process of joining similar or different metal by heating.
- What are the major applications of welding?
Welding is used in the fabrication of automobile bodies, air craft, machine frames, boilers, ship building, railway wagons, etc.
- What are the types of welding? Give example.
1) Plastic welding or pressure welding
Example : Electric resistance welding.
2) Fusion welding or non – pressure welding.
Example : Electric arc welding, gas welding.
- What are the types of consumable electrodes?
1.Bare electrodes:They are not coated with flux.
2. Lightly coated electrodes:A light layer of flux is coated on the electrodes.
3. Heavily coated electrodes: Flux is coated on the electrodes to a thickness of 1 mm to 3 mm
22. Give the expansion of MIG and TIG
MIG – Metal Inert Gas welding
TIG – Tungsten Inert Gas welding
- What is plasma in Welding?
Ionised gas jet is called plasma. It produces high heat and is used for joining metal together.
- What is spot welding? Give its applications.
- Spot welding is a type of resistance welding which is used for joining overlapping sheet metals by making weld at
regular interval. - Boxes, cans, automobile frames and air conditioners can be welded by spot welding.
- What is seam welding? List out its applications.
- Seam welding is a process of making weld continuously between two overlapping sheet metals.
- Seam welding is used for welding radiators, drums, leak proof tanks, automobile silencers, etc.
- What is thermit? Give the applications of thermit welding.
- Thermit steel is a mixture of aluminium powder and iron oxide in the ration of 1:3.
- Thermit welding is used for joining heavy parts, rails, pipes, shafts, cables and worn out machine frames.
- What is gas welding? Name the gases used in gas welding.
Gas welding is a process of joining metals by the heat of the flame formed when oxygen burns with another gas
The following gases are used to produce flame in gas welding.
1) Oxygen – acetylene
2) Oxygen – hydrogen
3) Air- acetylene
- List out the equipment need for gas welding.
Gas cylinders 2. Pressure regulators 3. Pressure gauges 4. Hoses 5. Welding torch
29. What are the three types of flames in gas welding?
1) Neutral flame 2) Carburising flame 3) Oxidising flame
30. What is neutral flame? Give its application.
- The neutral flame is produced when equal quantity of oxygen and acetylene gases are used.
- Neutral flame is used for welding steel, cast iron, aluminium, copper and stainless steel.
31.When carburising flame is produced? State its applications.
- Carburising flame is produced when the quantity of acetylene is more than oxygen.
- Carburising flame is used for welding steel, alloy steels, non-ferrous metals, nickel and monel metal.
32.How oxidising flame is produced? List out its applications.
- Oxidising flame is produced when the quantity of oxygen is more than acetylene.
- Oxidising flame is used for welding brass, bronze, manganese and steel.
33.Differentiate between soldering and brazing.
Soldering is the process of joining two similar or dissimilar metals by using a low melting alloy called solder. Solder is an alloy of tin and lead.
Brazing is the process of joining two similar or dissimilar metals by using a high melting alloy called spelter. Spelter is a mixture of copper and zinc alloy.
34. List out the various defects in welding.
1) Incomplete fusion 2) Slag inclusion 3) Crack 4) Undercut 3) Porosity and blow holes
