Manufacturing Engineering Questions & Answers
01. Alloy of nickel and iron is known as :
Invar
Explanation: Invar contains 36% nickel and 64% iron. Invar has the property of good hardness.
02. Major constituent of the gun metal alloy is :
Copper
Explanation: Gun metal contains 83% copper, 10% tin, and 2% zinc. where copper is the base metal.
03. Major constituent of Mutz metal alloy is :
Copper.
Explanation: Mutz metal contains 60% copper and 40% zinc. where copper is the base metal.
04. Major constituent of Nichrome alloy is :
Nickel.
Explanation: Nichrome contains 80% nickel and 20% chromium. where nickel is the base metal.
05. Major constituent of Constantan alloy is :
Copper.
Explanation: Constantan contains 60% copper and 40% nickel. where copper is the base metal.
06. which alloy is widely used in thermo couples?
Nichrome.
Explanation: Nichrome contains 80% nickel and 20% chromium and used in thermo couples and strain gauges.
07. What is the approximate percentage of Lead in soft solder?
50.
Explanation: Soft solder contains 50% lead and 50% tin. It is used in a fabrication process of two material at a temperature below 450 degree centigrade.
08. Magnetic Bubbles are used as :
Storage device.
Explanation: Magnetic properties of material are used for making different storage devices.
09. With an increase in temperature of a semiconductor, resistance of semiconductor.
Decreases.
Explanation: Semiconductor has a negative temperature coefficient of resistance. Their resistance increases with a decrease in temperature.
10. Thermosetting plastics have
1 degree bond.
Explanation: Thermosetting plastics have 1 degree bond. Thermosetting plastics have three dimensional network of primary bond.
11. Primary bond network of thermosetting plastic is :
3-Dimensional.
Explanation: Thermosetting plastics have three dimensional network of a primary bond. Thermosetting plastics have 1 degree bond.
12. Thermoplastics have
2 degree bond.
Explanation: Thermoplastics have 2 degree bond. Thermoplastics have one dimensional network of a secondary bond.
13.following is a correct chemical property of quartz.
Acidic
Explanation: Quartz comes under acidic refractory.whereas sand, quartz and silica brick are acidic.
14. following is a chemically neutral refractory.
Silicon carbide.
Explanation: Silicon carbide is a neutral refractory.
15. Which of the ceramics can be used as pigment in paints?
Titanium oxide.
Explanation: Titanium oxide is generally used as pigment in paints. It has a very high density.
16. following will give better chip flow.
Positive back rake angle tool.
Explanation: With positive back rake angle, lip angle decreases and space for chip flow increases and hence it will give better chip flow.
17. following will give large friction during chip flow.
Negative back rake angle tool.
Explanation: With negative back rake angle, lip angle increases and space for chip flow decreases due to which it offers large resistance to chip flow.
18. Positive rake angle is given for machining of:
Ductile material.
Explanation: Positive rake angle have better chip flow. As the amount of chip flow in ductile material is large, hence positive back rake angle tool will be a better option for machining ductile material.
19. Negative back rake angle is given for machining of:
Brittle and hard material
Explanation: Brittle material has smaller amount of chip flow and are very strong. As negative back angle tool are very strong, hence these are used for machining of brittle and hard material.
20. following will give maximum chip flow during machining.
Ductile material.
Explanation: Brittle material breaks very easily due to which they have maximum chip flow.
21. With an increase in rake angle of tool, tool life will
First increase then decrease.
22. For machining of carbide material following tool will be preferred.
Large negative rake angle tools.
Explanation: Carbide materials are very hard hence strong tool is required for their machining. Tools with large negative back rake angle are stronger.
23. following tool will give the best result for machining of brass.
Zero rake angle tools
Explanation: Brass is neither very hard nor very soft and zero rake angle tool would be the best option for machining of brass.
24. With an increase in rake angle of tool, tool life will
First increase then decrease.
Explanation: With an increase in side cutting edge angle width of cut decreases, hence the chip removal rate is good due to which toll life increases. After some limit increasing side cutting angle will decrease tool life to increase in interaction of tool with work piece.
25. What is the optimum value of side cutting edge in degrees for maximum tool life?
30.
Answer: d
Explanation: At 30 degree chip removal rate and strength of tool are optimum and hence tool life will be maximum.
01. Alloy of nickel and iron is known as :
Invar
Explanation: Invar contains 36% nickel and 64% iron. Invar has the property of good hardness.
02. Major constituent of the gun metal alloy is :
Copper
Explanation: Gun metal contains 83% copper, 10% tin, and 2% zinc. where copper is the base metal.
03. Major constituent of Mutz metal alloy is :
Copper.
Explanation: Mutz metal contains 60% copper and 40% zinc. where copper is the base metal.
04. Major constituent of Nichrome alloy is :
Nickel.
Explanation: Nichrome contains 80% nickel and 20% chromium. where nickel is the base metal.
05. Major constituent of Constantan alloy is :
Copper.
Explanation: Constantan contains 60% copper and 40% nickel. where copper is the base metal.
06. which alloy is widely used in thermo couples?
Nichrome.
Explanation: Nichrome contains 80% nickel and 20% chromium and used in thermo couples and strain gauges.
07. What is the approximate percentage of Lead in soft solder?
50.
Explanation: Soft solder contains 50% lead and 50% tin. It is used in a fabrication process of two material at a temperature below 450 degree centigrade.
08. Magnetic Bubbles are used as :
Storage device.
Explanation: Magnetic properties of material are used for making different storage devices.
09. With an increase in temperature of a semiconductor, resistance of semiconductor.
Decreases.
Explanation: Semiconductor has a negative temperature coefficient of resistance. Their resistance increases with a decrease in temperature.
10. Thermosetting plastics have
1 degree bond.
Explanation: Thermosetting plastics have 1 degree bond. Thermosetting plastics have three dimensional network of primary bond.
11. Primary bond network of thermosetting plastic is :
3-Dimensional.
Explanation: Thermosetting plastics have three dimensional network of a primary bond. Thermosetting plastics have 1 degree bond.
12. Thermoplastics have
2 degree bond.
Explanation: Thermoplastics have 2 degree bond. Thermoplastics have one dimensional network of a secondary bond.
13.following is a correct chemical property of quartz.
Acidic
Explanation: Quartz comes under acidic refractory.whereas sand, quartz and silica brick are acidic.
14. following is a chemically neutral refractory.
Silicon carbide.
Explanation: Silicon carbide is a neutral refractory.
15. Which of the ceramics can be used as pigment in paints?
Titanium oxide.
Explanation: Titanium oxide is generally used as pigment in paints. It has a very high density.
16. following will give better chip flow.
Positive back rake angle tool.
Explanation: With positive back rake angle, lip angle decreases and space for chip flow increases and hence it will give better chip flow.
17. following will give large friction during chip flow.
Negative back rake angle tool.
Explanation: With negative back rake angle, lip angle increases and space for chip flow decreases due to which it offers large resistance to chip flow.
18. Positive rake angle is given for machining of:
Ductile material.
Explanation: Positive rake angle have better chip flow. As the amount of chip flow in ductile material is large, hence positive back rake angle tool will be a better option for machining ductile material.
19. Negative back rake angle is given for machining of:
Brittle and hard material
Explanation: Brittle material has smaller amount of chip flow and are very strong. As negative back angle tool are very strong, hence these are used for machining of brittle and hard material.
20. following will give maximum chip flow during machining.
Ductile material.
Explanation: Brittle material breaks very easily due to which they have maximum chip flow.
21. With an increase in rake angle of tool, tool life will
First increase then decrease.
22. For machining of carbide material following tool will be preferred.
Large negative rake angle tools.
Explanation: Carbide materials are very hard hence strong tool is required for their machining. Tools with large negative back rake angle are stronger.
23. following tool will give the best result for machining of brass.
Zero rake angle tools
Explanation: Brass is neither very hard nor very soft and zero rake angle tool would be the best option for machining of brass.
24. With an increase in rake angle of tool, tool life will
First increase then decrease.
Explanation: With an increase in side cutting edge angle width of cut decreases, hence the chip removal rate is good due to which toll life increases. After some limit increasing side cutting angle will decrease tool life to increase in interaction of tool with work piece.
25. What is the optimum value of side cutting edge in degrees for maximum tool life?
30.
Answer: d
Explanation: At 30 degree chip removal rate and strength of tool are optimum and hence tool life will be maximum.
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