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
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
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
A Resistance
B Arc
C Low frequency induction
D None of these
In direct arc furnace, which of the following has high value?
A Current
B Voltage
C Power factor
D All of the above
The refractory lining of the bottom in a basic electric arc furnace is made of
A Silica
B Alumina
C Magnesia
D Fireclay
Silver chloride electrode is used as a reference electrode due to its
A Large half cell potential
B Stable half cell potential
C Stable resting potential
D Stable action potential
The air gap between the central electrode and ground (or side) electrode of a spark plug is around
A 0.2 mm
B 0.5 mm
C 1 mm
D 1.5 mm
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°
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

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