The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following

Choose the right option among the alternatives – A thyristor goes into full conduction in its forward direction when anode/cathode/gate is positive with respect to its anode/cathode/gate and a turn-on voltage or current signal in the form of a pulse is given to its anode/ cathode/gate.

A

Cathode, anode, gate

B

Gate, anode, cathode

C

Anode, cathode, gate

D

Anode, gate, 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

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 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

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

With reference to street-lighting, how do Mercury vapour lamps differ from LED lamps? 1. Mercury vapour lamps use a fraction of the energy used in the case of LED lamps. 2. LEDs have a lower radiance than mercury arc lamps. 3. Mercury lamps are eco-friendly as they require low voltages than LED lamps to operate. Select the correct answer using the code given below.

A

2 only

B

3 only

C

1 and 3 only

D

1, 2 and 3

Assertion (A) For a galvanic cell, oxidation takes place at anode and reduction at cathode.
Reason (R) Electrons in the external circuit move from anode to cathode

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true, but R is not the correct explanation of A

C

A is true, but R is false

D

A is false, but R is true

The potential drop in the arc, in a mercury arc rectifier, varies

A

0.05 V to 0.2 V per cm length of the arc

B

0.5 V to 1.5 V per cm length of the arc

C

2 V to 3.5 V per cm length of the arc

D

none of the above

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

Potential of earth is – 50 V. If the potential difference between anode and cathode (earthed) is measured as 150 V, actual voltage on anode is __________

A

0 V

B

100 V

The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following

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