1
GATE PI 1991
MCQ (Single Correct Answer)
+2
-0.6
In welding process, penetration is increased by
A
increasing current and decreasing speed
B
decreasing both current and speed
C
increasing both arc voltage and speed
D
increasing arc voltage and decreasing
2
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 $$30$$$$secs$$.
3
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 $$mm$$
A
$$0.5$$
B
$$1$$
C
$$5$$
D
$$10$$
4
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

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