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
In a three-phase mercury arc rectifiers each anode conducts for
A One-third of a cycle
B One-fourth of a cycle
C One-half a cycle
D Two-third of a cycle
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
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

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