Wednesday, 24 November 2021

QUALITY TECHNICAL RESEARCH, IS IT THERE OR NOT?

 

QUALITY TECHNICAL RESEARCH, IS IT THERE OR NOT? 

PhD research topic is always by choice and liking of the research scholar and he / she chooses the research supervisor accordingly but PhD is by compulsion these days for the sake of building CVs of the faculty members. Research scholars have no freedom to choose / select the research supervisor / the topic of research. 

Therefore, quality research output despite sinking thousands of crores of taxpayer’s money is not there and won’t be there for many years to come due to the existence of such faculty members who think that the research scholars are the passport for their next promotion ONLY. 

There is a caucus working on the principle of “You scratch my back; I will scratch yours” in most of the Govt. funded research institutions. 

Nepotism / may be plutocracy / incompetent Selection Committees are singly or jointly responsible for this state of affairs. 

JEE and JEE advanced are fully responsible for guaranteeing the effluence and roaring business of private coaching centers in the country. 

No immediate action to check these issues means the youth, parents and education system will continue to be taken for a ride by the self-attested World class research faculty and the institutions.

Saturday, 5 June 2021

HUMAN IGNORANCE, DESTROYING ENVIRONMENT: HAVE SPACE FOR NEXT GENERATION

 

HUMAN IGNORANCE, DESTROYING ENVIRONMENT: HAVE SPACE FOR NEXT GENERATION

Celebrating environment day (June 05) and simultaneously destroying it is a serious dichotomy. We must assess the volume of damage humans are causing continuously by way of using Cosmetics, Perfumery, Toiletries, Cleaning & Washing agents, Tieing & dyeing clothes using synthetic dies, Fertilizers etc. 

On one hand we talk of ‘Environmental protection’ and on the other hand we are destroying it in a big way. Is it due to ignorance or we don’t want to take note of it? There is therefore a serious flaw in our philosophy for the environment.

We must reorient our research for eliminating environmental pollution due to our irresponsible acts. Existing research may continue side by side but the research in this area must start immediately and on war footing. Can researchers and research institutes escape responsibility and accountability?

Our open-loop behaviour as a matter of fact is seriously destroying the environment. 
Remember we will have to save the environment if we want our next generation to enjoy healthy life style. 
Anyway, happy ‘Environment day’



Thursday, 3 June 2021

SAMPLE PAPER FOR BLOG ON viva-written-format-equal-opportunity

SAMPLE PAPER FOR BLOG ON viva-written-format-equal-opportunity.html 

VIVA: WRITTEN FORMAT, EQUAL OPPORTUNITY EVALUATION PROCEDURE (SAMPLE)

Programme

Course No. & Name

Semester, Session

MM: 100

Practical Quiz

Venue

Time

Date

 

Name:

Roll No.:

Signature:

 

  • True / False statements. Answer all statements by checking the appropriate box, ‘T’ for True, or ‘F’ for False.
  • ONE mark would be awarded for each correct answer, but TWO marks would be deducted (-2) for each wrong answer.
  • No marks would be deducted for unattempted statements or skipped statements. Therefore ATTEMPT ONLY WHEN SURE. Please note, engineering education has no room for guessing.

 

#

Statement

T/F

1.  

Metal transfer through the arc stream varies greatly with different gas shielding.

T

2.  

The stickout is the distance between the end of the contact tube and the tip of the welding arc in semi-automatic welding processes.

T

3.  

At the same weld speed, decrease in electrode size will increase the cross-sectional area of weld bead in SMAW process.

F

4.  

Welding in ‘Vertical-up’ direction is more difficult than vertical-down direction in arc welding.

T

5.  

Primary of the transformer power source can’t be connected to DC suppy.

F

6.  

A manual metal arc covered electrode can have a metal deposition efficiency greater than 130%

T

7.  

Weld bead penetration increases with increase in thermal conductivity of the weld metal.

F

8.  

Moisture is one of the major causes of cold cracking in welds.

T

9.  

DCEP- is the specific direction of current flow through a welding circuit.

T

10.   

Inverter-Power source is one, which converts AC-DC-AC.

T

11.   

Oxygen or carbon dioxide additions to the inert shielding gas stabilizes the arc, but usually results in increased fume formation rates.

T

12.   

SAW has the lowest fume formation rate amongst all the arc processes,.

T

13.   

Electrode size is nominated by diameter of the covered core wire.

T

14.   

Increase in carbon weight percentage will increase ductility of steels.

F

15.   

The droopers are commonly known as constant voltage welding machines.

F

16.   

The portion of the base metal which doesn’t melt during arc welding is called fusion zone.

F

17.   

A cavity formed by gas entrapment during welding is called inclusion.

F

18.   

Heat Affected Zone stand for the portion of the base metal affected by the heat of the welding arc but doesn’t experience melting.

T

19.   

The penetration can be reduced by simple manipulation of the arc gap, at the same welding current.

T

20.   

Micro-hardness testing is best suitable for materials with very fine multi-phase microstructure.

T

21.   

Ceramic materials can be tested by Vickers hardness testing.

T

22.   

SMAW is the preferred process for reactive metals.

F

23.   

Change in type of shielding gas will affect the weld bead geometry.

T

24.   

‘Drag electrode’ is a term used in SMAW process.

T

25.   

SMAW is the preferred process for zinc and zirconium.

F

26.   

The maximum allowable current is determined by the length of the stick electrode.

F

27.   

Metal fumes of some metals are carcinogenic.

T

28.   

Any increase in arc voltage with constant current will increase the weld bead width in SAW process.

T

29.   

DCEP is also known as ‘straight polarity’.

F

30.   

Arc length increases with the increase in arc voltage.

T

31.   

Heavy coated iron powder electrodes are designed for high deposition welding.

T

32.   

Low hydrogen electrodes are used to weld hardenable steels.

T

33.   

DCEN is preferable than DCEP for surfacing process with SMAW process.

F

34.   

Toughness of mild steel is more at –20 °C than at 30°C.

F

35.   

Autogenous welds are not possible with GTAW.

F

36.   

Post weld cleaning is more in GMAW process.

F

37.   

GTAW gives the best quality welding compared to GMAW and SAW.

T

38.   

GMAW is best suitable for inaccessible positional welding.

F

39.   

The arc in helium is more penetrating than Argon.

T

40.   

GTAW is a preferred process for thicker sections.

F

41.   

GMAW is a recommended process for outdoor welding.

F

42.   

Operator duty cycle of the welding power source is greater in SMAW process than that of GMAW process.

F

43.   

Change in type of shielding gas will affect the weld pool shape at the same arc voltage.

T

44.   

Electrodes with different tip shapes in GTAW affect the weld quality.

T

45.   

The voltage drop across the welding cables is lower in case of AC supply when compared to DC supply.

T

46.   

CO2 is the only reactive gas that is used as a shielding gas in GMAW.

T

47.   

Droopers are the choice when using large diameter covered electrodes with higher coating ratios in SMAW.

T

48.   

OCV will remain constant on both during and after welding in SMAW.

F

49.   

The maximum temperature that is reached in SMAW arc is around 5000 ~ 6000 °C.

T

50.   

Charpy V notch test is conducted for determining the hardness of the composite metal.

F

51.   

Cellulosic electrodes are the most efficient electrodes for high carbon steels.

F

52.   

The study of weldability is usually confined to the weld metal of the joint.

F

53.   

The best welding technique for obtaining sound weld for any material is the one that gives maximum linear heat input.

F

54.   

Medium carbon steels have better weldability than mild carbon steels.

F

55.   

High hardenable materials have low weldability.

T

56.   

Larger the weldment reinforcement, better the rigidity and strength of the joint.

F

57.   

Stress relieving may be necessary for Q&T steels to prevent cracking.

T

58.   

The intensity of welding heat source is distributed uniformly over the contact area.

F

59.   

The most difficult material to weld is low carbon steel.

F

60.   

High heat input and slower cooling always increase the amount of dilution.

T

61.   

The main cause for HAZ cracking in base metal is lack of shielding.

F

62.   

Pre / post weld heating are the common methods applied to control the weld metal dilution.

F

63.   

The volume of deposited metal is greater in single ‘V’ groove joint than a double ‘V’ groove joint.

T

64.   

Vertical down welding is an example of “out of position welding”.

T

65.   

Increase in welding speed during SAW reduces cooling rate.

F

66.   

Weldability is reduced by the presence of Sulphur and Phosphorous in the base metal.

T

67.   

Unequal leg size is a defect for fillet welds.

T

68.   

The intensity of heat from a welding heat source cannot generally be expressed as a precise number.

T

69.   

Self-shielded flux cored arc welding (FCAW-S) can’t be used for welding of cross country pipelines.

F

70.   

With the increase in viscosity of molten metal there are more chances of lack of fusion.

T

71.   

Sulphur increases the cold cracking susceptibility in the weld metal.

F

72.   

Increase in carbon weight percentage will decrease the melting temperature and ductility in steels.

T

73.   

Strength to weight ratio of pure aluminum is more than high strength steel.

T

74.   

If you double the amperage in a given welding cable then the heat produced will also be doubled.

F

75.   

If a welding cable produces too much heat, the remedy would be to reduce the diameter of the cable.

F

76.   

Cold cracking defect is associated with phosphorous presence in weld metal.

F

77.   

Increase in welding current during welding causes increase in weld penetration.

T

78.   

Charpy impact test is an example of NDT.

F

79.   

Cracks occur because the stress at the point in the weldment exceeds the yield strength.

T

80.   

DC of the equivalent voltage and amperage is more dangerous than of an A.C. line in welding.

T

81.   

The delayed cracking in welds is due to the presence of moisture during welding.

T

82.   

Phosphorous increases the hot cracking susceptibility in base metal

T

83.   

It is difficult to define the area of contact between the heat source and the work piece in welding.

T

84.   

Inter-pass cleaning is done for avoiding slag inclusion.

T

85.   

Presence of Carbon in iron is an example of substitutional solid solution.

F

86.   

In SAW process increase in arc voltage with constant welding current will increase the flux consumption.

T

87.   

Flame hardening is a case hardening process.

T

88.   

Arc welding can produce Ozone.

T

89.   

Heat balance is not important criteria in resistance welding materials of different electrical conductivities.

F

90.   

Super conductivity is a phenomenon associated with metals at room to elevated temperatures.

T

91.   

The arc in Helium is more penetrating than Argon.

T

92.   

The droopers are commonly known as constant voltage welding machines

F

93.   

Gas is also used as a coolant in GTAW process.

T

94.   

GMAW is a better process for reactive materials than GTAW.

F

95.   

The best welding technique for obtaining sound weld for any material is the one that gives maximum linear heat input.

F

96.   

Medium carbon steels have better weldability than mild carbon steels.

F

97.   

Chlorinated hydrocarbons should never be used for degreasing the joint surfaces during arc welding.

T

98.   

Larger the weldment reinforcement, better the rigidity and strength of the joint.

F

99.   

Deadly nerve gas Phosgene can also be produced during arc welding if proper precautions are not taken.

T

100.         

Infrared radiation is more harmful than UV radiation.

F