Related Questions

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
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
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 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
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
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
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 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
In a mercury arc rectifier______ flow from anode to cathode
A ions
B electrons
C ions and electrons
D any 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

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