Related Questions

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
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
Capillary rise of mercury in a small diameter tube is proportional of (where, d = mercury of the rube, σ = surface tension of mercury)
A d
B 1/d
C σ
D 1/σ
Which of the following is the loss within the mercury arc rectifier chamber?
A Voltage drop in arc
B Voltage drop at the anode
C Voltage drop at the cathode
D All of the above
The voltage drop at anode, in a mercury arc rectifier is due to
A self restoring property of mercury
B high ionization potential
C energy spent in overcoming the electrostatic field
D high temperature inside the rectifier
Which of the following mercury arc rectifier will deliver least undulating current?
A Six-phase
B Three-phase
C Two-phase
D Single-phase
In a mercury arc rectifier, the anode is usually made of
A copper
B aluminium
C silver
D graphite
E tungsten
If cathode and anode connections in a mercury arc rectifier are inter changed
A The rectifier will not operate
B Internal losses will be reduced
C Both ion and electron streams will move in the same direction
D The rectifier will operate at reduced efficiency
To produce cathode spot in a mercury arc rectifier
A anode is heated
B tube is evacuated
C an auxiliary electrode is used
D low mercury vapour pressures are used
In a glass bulb mercury arc rectifier the maximum current rating is restricted to
A 2000 A
B 1500 A
C 1000 A
D 500 A

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