The internal efficiency of a mercury arc rectifier depends on___________?

A. Voltage only
B. Current only
C. Voltage and current
D. R.m.s. value of current

In a mercury pool rectifier, the voltage drop across its electrodes___________?

A. Is directly proportional to load
B. Is inversely proportional to load
C. Varies exponentially with the load current
D. Is almost independent of load current

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

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

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 ionization potential of mercury is approximately_____________?

A. 5.4 v
B. 8.4 v
C. 10.4 v
D. 16.4 v

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

In a mercury arc rectifier characteristic blue luminosity is due to_____________?

A. Colour of mercury
B. Ionization
C. High temperature
D. Electron streams

When a rectifier is loaded which of the following voltage drops take place ?

A. Voltage drop in transformer reactance
B. Voltage drop in resistance of transformer and smoothing chokes
C. Arc voltage drop
D. All of the above

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

A. Six-phase
B. Three-phase
C. Two-phase
D. Single-phase