Related Questions

If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as
A ARC
B Short ARC
C ARC length
D ARC blow
In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as
A Fusion
B Reverse polarity
C Forward welding
D Direct polarity
The length of an arc is 7π. If the diameter of the circle is 14, what is the degree of central angle by that arc?
A 90°
B 120°
C 180°
D 270°
The radius of circle A is r, and the radius of circle B is 3/4r. What is the ratio of the area of circle A to the area of circle B?
A 16 to 9
B 9 to 16
C 1 to 4
D 4 to 3
In a circle with center 0, RS is arc of the circle and RS=132 degrees. How many degrees are there in angle RSO?
A 66
B 20
C 22
D 24
If the ratio of the area of a sector to the area of the circle is 3: 5, What is the ratio of the length of the arc in the sector to the circumference of the circle?
A 3/5
B 2/7
C 1/3
D 1/2
A circle has a radius of 30 cm. Determine the length of the arc subtended by an angle of 60∘ at the center of the circle.
A  π6 cm
B 6π cm
C 10π cm
D 20π cm
In arc welding, the electric arc is produced between the work and the electrode by
A Voltage
B Flow of current
C Contact resistance
D All of these
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as
A maximum grid voltage
B critical grid voltage
C any of the above
D none of the above
The potential drop in the arc, in a mercury arc rectifier, varies
A 0.05 V to 0.2 V per cm length of the arc
B 0.5 V to 1.5 V per cm length of the arc
C 2 V to 3.5 V per cm length of the arc
D none of the above

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