1

GATE PI 1991

Subjective

+5

-0

A resistance welder is rated at $$50$$ $$kVA,$$ at $$50\% $$ duty cycle. Secondary voltage is always constant at $$25$$ volts. If a job requires $$1500$$Amps current, determine the maximum welding time in a total cycle time of $$30$$$$secs$$.

2

GATE PI 1991

MCQ (Single Correct Answer)

+5

-1.5

The voltage-arc length characteristic of a $$DC$$ arc is given by $$V=20+40L.$$ where $$L=$$ arc length in $$cm.$$ The power source characteristics can be approximated by a straight line. Open circuit is $$80V$$ and short circuit current $$1000$$Amps. The optimum arc length in $$mm$$

3

GATE PI 1991

Fill in the Blanks

+1

-0

Thrust force in drilling can be reduced by .................A............... the point angle and by ..........B.......... the helix angle of the drill

(a) increasing / reducing

(b) increasing / reducing

4

GATE PI 1991

Fill in the Blanks

+1

-0

Increase in rake angle causes ..........A................ in chip thickness and .............B......... in shear angle

(a) increase / reduction

(b) increase / decrease

Paper analysis

Total Questions

Casting

5

Joining of Materials

7

Machine Tools and Machining

8

Metal Forming

5

Metrology

4

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