Thursday, 3 June 2021

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

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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

 

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