Electrical Engineering MCQs

Page No. 173

To produce cathode spot in a mercury arc rectifier______________?


aanode is heated

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btube is evacuated

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can auxiliary electrode is used

✓


dlow mercury vapour pressures are used

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The advantage of mercury arc rectifier is that________________?


ait is light in weight and occupies small floor space

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bit has high efficiency

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cit has high overload capacity

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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

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cvoltage and current

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dr.m.s. value of current

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View Answer voltage only

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


ais directly proportional to load

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bis inversely proportional to load

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cvaries exponentially with the load current

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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

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c both ion and electron streams will move in the same direction

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d the rectifier will operate at reduced efficiency

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The voltage drop at anode, in a mercury arc rectifier is due to_____________?


aself restoring property of mercury

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bhigh ionization potential

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cenergy spent in overcoming the electrostatic field

✓


d high temperature inside the rectifier

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The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following_____________?


aanode drop and cathode drop

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b anode drop and arc drop

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ccathode drop and arc drop

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danode drop, cathode drop and arc drop

✓



The ionization potential of mercury is approximately_____________?


a5.4 V

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b8.4 V

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c10.4 V

✓


d16.4 V

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View Answer 10.4 V

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


a2000 A

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b1500 A

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c 1000 A

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d500 A

✓


View Answer 500 A

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


acolour of mercury

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bionization

✓


chigh temperature

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delectron streams

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View Answer ionization

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