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MCQs 1: Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of _____________?

100 A at 100 V 200 A at 200 V 300 A at 300 V 400 A at 400 V 500 A at 500 V
Answer Explanation

MCQs 2: The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?

expenditure of energy in ionization surface resistance expenditure of energy in overcoming the electrostatic field expenditure of energy in liberating electrons from the mercury
Answer Explanation

MCQs 3: To produce cathode spot in a mercury arc rectifier______________?

anode is heated tube is evacuated an auxiliary electrode is used low mercury vapour pressures are used
Answer Explanation

MCQs 4: The advantage of mercury arc rectifier is that________________?

it is light in weight and occupies small floor space it has high efficiency it has high overload capacity it is comparatively noiseless all of the above
Answer Explanation

MCQs 5: The internal efficiency of a mercury arc rectifier depends on___________?

voltage only current only voltage and current r.m.s. value of current none of the above
Answer Explanation

MCQs 6: In a mercury pool rectifier, the voltage drop across its electrodes___________?

is directly proportional to load is inversely proportional to load varies exponentially with the load current is almost independent of load current
Answer Explanation

MCQs 7: If cathode and anode connections in a mercury arc rectifier are inter changed_____________?

the rectifier will not operate internal losses will be reduced both ion and electron streams will move in the same direction the rectifier will operate at reduced efficiency
Answer Explanation

MCQs 8: The voltage drop at anode, in a mercury arc rectifier is due to_____________?

self restoring property of mercury high ionization potential energy spent in overcoming the electrostatic field high temperature inside the rectifier
Answer Explanation

MCQs 9: The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following_____________?

anode drop and cathode drop anode drop and arc drop cathode drop and arc drop anode drop, cathode drop and arc drop
Answer Explanation

MCQs 10: The ionization potential of mercury is approximately_____________?

5.4 V 8.4 V 10.4 V 16.4 V
Answer Explanation

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