In the normal operation of an SCR, anode is ___________ w.r.t. cathode

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

In the normal operation of an SCR, anode is ___________ w.r.t. cathode

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