Which of the following is the loss within the mercury arc rectifier chamber?

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

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

Capillary rise of mercury in a small diameter tube is proportional of (where, d = mercury of the rube, σ = surface tension of mercury)

A

d

B

1/d

C

σ

D

1/σ

Which of the following mercury arc rectifier will deliver least undulating current?

A

Six-phase

B

Three-phase

C

Two-phase

D

Single-phase

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

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

In a mercury arc rectifier, the anode is usually made of

A

copper

B

aluminium

C

silver

D

graphite

E

tungsten

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

In a glass bulb mercury arc rectifier the maximum current rating is restricted to

A

2000 A

B

1500 A

C

1000 A

D

500 A

Which of the following is the loss within the mercury arc rectifier chamber?

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