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 metal rectifiers, as compared to mercury arc rectifiers
A operate on low temperatures
B can operate on high voltages
C can operate on heavy loads
D give poor regulation
E none of the above
In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.
A accelerates
B decelerates
C any of the above
D none of the above
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
A They are mechanically strong
B They do not require any voltage for filament heating
C Both (A) and (B)
D None of the above
Mercury, in arc rectifiers, is chosen for cathode because
A Its ionization potential is relatively low
B Its atomic weight is quite high
C Its boiling point and specific heat are low
D All of the above
তড়িৎ রাসায়নিক কোষের emf = ?i. E° Anode(ox) + E°Cathode (Red) 11. E Cathode(Red) - E°Anode (Red) 111. E° Anode(ox) - E°Cathode (Red) নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
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
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
A Moving mercury and graphite
B Graphite and moving mercury
C Moving mercury and carbon
D Moving mercury and crimped steel wire
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
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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