1
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
Which pair among the following solid state welding processes uses heat from an external source
$$P$$- Diffusion welding
$$Q$$- Friction welding
$$R$$- Ultrasonic welding
$$S$$- Forge welding
$$P$$- Diffusion welding
$$Q$$- Friction welding
$$R$$- Ultrasonic welding
$$S$$- Forge welding
2
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
3
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
4
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:
Questions Asked from Welding (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE PI Subjects
Engineering Mechanics
Strength of Materials
Theory of Machines
Engineering Mathematics
Machine Design
Fluid Mechanics
Thermodynamics
Casting
Joining of Materials
Metal Forming
Machine Tools and Machining
Metrology
Industrial Engineering