Related Questions

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 gate current is increased, then anode-cathode voltage at which SCR closes ___________
A Is decreased
B Is increased
C Remains the same
D None of the above
In normal operation of an SCR, gate is ___________w.r.t. cathode
A Positive
B Negative
C At zero potential
D None of the above
Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A Occurs higher in the electro-chemical series of metals
B Is exemplified by magnesium plate
C Is much cheaper than the cathodic base material to be guarded against corrosion
D All of the above
  Zn/Zn2+  (E° = + 0.76V ) অ্যানোড (Anode) হলে নিম্নের কোনটি ক্যাথোড (Cathode) রুপে ব্যবহার করা যাবে?
A  Co/Co2+(E° =+0.28 V)   
B   Mg/Mg2+ (E° =+2.36 V)
C     Ca/Ca2+ (E°= +2.87 V)   
D Al/Al3+ (E° =+ 1.66 V) 
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
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 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
In a mercury arc rectifier______ flow from anode to cathode
A ions
B electrons
C ions and electrons
D any 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

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