1

GATE PI 2001

MCQ (Single Correct Answer)

+5

-1.5

A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/min;$$ wire diameter: $$1.2$$ $$mm;$$ Wire feed rate: $$4$$ $$m/min;$$ Thermal efficiency of the process: $$65\% $$

The area of cross section of weld bead in $$m{m^2}$$ is:

2

GATE PI 2001

Subjective

+5

-0

In certain machining operation with a cutting speed of $$50$$ $$m/min,$$ tool life of $$45$$ minutes was observed, when the cutting speed was increased to $$100$$ $$m/min,$$ the tool life decreased to $$10$$ minutes. The cutting speed for maximum productivity, if tool change time is $$2$$ minutes is

3

GATE PI 2001

Subjective

+5

-0

Tool life in drilling steel using $$HSS$$ drill is expressed as $${T^{0.2}} = 9.8\,\,{D^{0.4}}\,\,/\,\,V\,{s^{0.5}}$$ where $$D$$ is the drill diameter (in $$mm$$), $$T$$ is the tool life (in minutes), $$V$$ is the cutting speed (in $$m/min$$) and $$s$$ is the feed ($$mm/rev$$). The feed is set at maximum possible value of $$0.4$$ $$mm/rev$$ for a given drill diameter of $$30mm.$$ The length of drilling is $$50mm.$$ The machine hour rate Rs $$60$$ and the cost of drill is Rs. $$400.$$

$$i)$$ For the given conditions, the tailor's exponent and constant are .............

$$ii)$$ The optimum cutting speed, $${V_{opt}},$$ neglecting the work-piece and tool changing times is

4

GATE PI 2001

MCQ (Single Correct Answer)

+1

-0.3

In Whitworth quick return mechanism (used in shapers) the velocity of the $$ram$$ is maximum at

Paper analysis

Total Questions

Casting

1

Joining of Materials

3

Machine Tools and Machining

3

Metal Forming

1

More papers of GATE PI

GATE PI 2017

GATE PI 2016

GATE PI 2015

GATE PI 2014

GATE PI 2013

GATE PI 2012

GATE PI 2011

GATE PI 2010

GATE PI 2009

GATE PI 2008

GATE PI 2007

GATE PI 2006

GATE PI 2005

GATE PI 2004

GATE PI 2003

GATE PI 2002

GATE PI 2001

GATE PI 1995

GATE PI 1994

GATE PI 1993

GATE PI 1992

GATE PI 1991

GATE PI 1990

GATE PI 1989

GATE PI
Papers

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

1995

1994

1993

1992

1991

1990

1989