1
GATE PI 2007
MCQ (Single Correct Answer)
+2
-0.6
The $$DC$$ power source for arc welding has the characteristic $$3V + 1 = 240,$$ where $$V=$$ Voltage and $${\rm I}\,\, = $$ current in amp. For maximum arc power at the electrode, voltage should be set at
A
$$20V$$
B
$$40V$$
C
$$60V$$
D
$$80V$$
2
GATE PI 2005
MCQ (Single Correct Answer)
+2
-0.6
Two $$8$$ $$mm$$ thick steel plates are placed $$5$$ $$mm$$ apart and welded by a butt joint. Welding is carried out at $$20$$ $$V$$ and speed of $$5$$ $$mm/sec.$$ Heat transfer efficiency is $$0.80.$$ If the heat required to melt steel is $$10$$ $$J/m{m^3}$$ and melting efficiency is $$0.625.$$ The weld current (in Amperes) will be
A
$$100$$
B
$$200$$
C
$$300$$
D
$$400$$
3
GATE PI 2005
MCQ (Single Correct Answer)
+2
-0.6
Match List - I (welding problems) with List - II (Causes) and select the correct answer using the codes given below the lists: GATE PI 2005 Joining of Materials - Welding Question 28 English
A
$$A - 2,\,B - 1,\,C - 5,\,D - 3$$
B
$$A - 3,\,B - 4,\,C - 2,\,D - 1$$
C
$$A - 2,\,B - 4,\,C - 5,\,D - 3$$
D
$$A - 3,\,B - 1,\,C - 4,\,D - 2$$
4
GATE PI 2005
MCQ (Single Correct Answer)
+2
-0.6
Consider the following statements:

The size of the heat affected zone (HAZ) will increase with
$$1.$$ increased starting temperature
$$2.$$ increased welding speed
$$3.$$ increased thermal conductivity of the base metal
$$4.$$ increase in base metal thickness

Which of the statements given above are correct?

A
$$1,2$$ and $$3$$
B
$$1$$ and $$3$$
C
$$1$$ and $$4$$
D
$$2$$ and $$3$$
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