Electrical Engineering MCQs

Page No. 173

To produce cathode spot in a mercury arc rectifier______________?


aanode is heated


btube is evacuated


can auxiliary electrode is used


dlow mercury vapour pressures are used



The advantage of mercury arc rectifier is that________________?


ait is light in weight and occupies small floor space


bit has high efficiency


cit has high overload capacity


dall of the above


View Answer all of the above

The internal efficiency of a mercury arc rectifier depends on___________?


avoltage only


b current only


cvoltage and current


dr.m.s. value of current


View Answer voltage only

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


ais directly proportional to load


bis inversely proportional to load


cvaries exponentially with the load current


dis almost independent of load current



If cathode and anode connections in a mercury arc rectifier are inter changed_____________?


athe 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_____________?


aself restoring property of mercury


bhigh ionization potential


cenergy 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_____________?


aanode drop and cathode drop


b anode drop and arc drop


ccathode drop and arc drop


danode drop, cathode drop and arc drop



The ionization potential of mercury is approximately_____________?


a5.4 V


b8.4 V


c10.4 V


d16.4 V


View Answer 10.4 V

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


a2000 A


b1500 A


c 1000 A


d500 A


View Answer 500 A

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


acolour of mercury


bionization


chigh temperature


delectron streams


View Answer ionization

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