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
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
The electrode of a direct arc furnace is made of
A Tungsten
B Graphite
C Silver
D Copper
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
A 1800
B 2200
C 2400
D 2700
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 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
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
A Globular transfer
B Spray transfer
C GMAW practice
D Dip transfer

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