1
GATE PI 2007
+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
+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
+2
-0.6
Match List - I (welding problems) with List - II (Causes) and select the correct answer using the codes given below the lists: 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
+2
-0.6
Consider the following statements :

The magnitude of residual stresses in welding depends upon
$$1.$$ Metal melted / deposited
$$2.$$ Design of weldment
$$3.$$ Support and clamping of components
$$4.$$ Welding process used

Which of the statements given above are correct?

A
$$1,2$$ and $$4$$
B
$$1,2$$ and $$3$$
C
$$1$$ and $$3$$
D
$$2$$ and $$3$$
GATE PI Subjects
Fluid Mechanics
Metrology
Theory of Machines
Engineering Mathematics
Heat Transfer
Machine Tools and Machining
Industrial Engineering
Engineering Mechanics
Strength of Materials
Thermodynamics
Machine Design
Casting
Joining of Materials
Metal Forming
EXAM MAP
Joint Entrance Examination