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
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
The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following
A anode drop and cathode drop
B anode drop and arc drop
C cathode drop and arc drop
D anode drop, cathode drop and arc drop
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 a mercury arc rectifier characteristic blue luminosity is due to
A colour of mercury
B ionization
C high temperature
D electron streams
In a mercury pool rectifier, the voltage drop across its electrodes
A is directly proportional to load
B is inversely proportional to load
C varies exponentially with the load current
D is almost independent of load current
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
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

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