Related Questions

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 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 cathdde voltage drop, in a mercury arc rectifier, is due to
A expenditure of energy in ionization
B surface resistance
C expenditure of energy in overcoming the electrostatic field
D expenditure of energy in liberating electrons from the mercury
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
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
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 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
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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