A mercury arc rectifier possesses __________ regulation characteristics

Related Mcqs:

1. 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

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

   A. Voltage drop in arc
   B. Voltage drop at the anode
   C. Voltage drop at the cathode
   D. All of the above

3. In a mercury arc rectifier, the anode is usually made of_____________?

   A. copper
   B. aluminium
   C. silver
   D. graphite
   E. tungsten

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

   A. colour of mercury
   B. ionization
   C. high temperature
   D. electron streams

5. 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

6. 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

7. 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

8. 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

9. The advantage of mercury arc rectifier is that________________?

   A. it is light in weight and occupies small floor space
   B. it has high efficiency
   C. it has high overload capacity
   D. it is comparatively noiseless
   E. all of the above

10. The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?

    A. expenditure of energy in ionization
    B. surface resistance
    C. expenditure of energy in overcoming the electrostatic field
    D. expenditure of energy in liberating electrons from the mercury