Q.1.
To produce cathode spot in a mercury arc rectifier
Q.2.
If cathode and anode connections in a mercury arc rectifier are inter changed
Q.3.
Which of the following metals is generally manufactured by electrolysis process?
Q.4.
In a mercury arc rectifier, the anode is usually made of
Q.5.
When a rectifier is loaded which of the following voltage drops take place ?
Q.6.
In a mercury pool rectifier, the voltage drop across its electrodes
Q.7.
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
Q.8.
Which of the following methods may be used to convert A.C. system to D.C.?
Q.9.
On which of the following factors the number of phases for which a rectifier should be designed depends?
Q.10.
With a motor converter it is possible to obtain D.C. voltage only upto
Q.11.
A commutating rectifier consists of commutator driven by
Q.12.
The voltage drop at anode, in a mercury arc rectifier is due to
Q.13.
The efficiency of an electrolytic rectifier is nearly