In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode. accelerates any of the listed here decelerates none of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
It is the_______of the transformer on which the magnitude of angle of overlap depends. resistance all of the listed here capacitance leakage reactance TRUE ANSWER : ? YOUR ANSWER : ?
The efficiency of the copper oxide rectifier seldom exceeds 65 to 75% 80 to 85% 85 to 90% 90 to 95% TRUE ANSWER : ? YOUR ANSWER : ?
The efficiency of an electrolytic rectifier is nearly 50 % 60 % 40 % 70 % TRUE ANSWER : ? YOUR ANSWER : ?
Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of 500 A at 500 V 100 A at 100 V 400 A at 400 V 300 A at 300 V TRUE ANSWER : ? YOUR ANSWER : ?
A rotary converter operates at a high power factor zero power factor low power factor None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
In a glass bulb mercury arc rectifier the maximum current rating is restricted to 1500 A 500 A 200 A 2000 A TRUE ANSWER : ? YOUR ANSWER : ?
Ageing of a selenium rectifier may change the output voltage by 25 to 30 per cent 5 to 10 per cent None of the listed here 15 to 20 per cent TRUE ANSWER : ? YOUR ANSWER : ?
The ignited or auxiliary anode in mercury arc rectifier is made of Boron carbide Copper Graphite Aluminium TRUE ANSWER : ? YOUR ANSWER : ?
If cathode and anode connections in a mercury arc rectifier are inter changed Both ion and electron streams will move in the same direction The rectifier will not operate The rectifier will operate at reduced efficiency Internal losses will be reduced TRUE ANSWER : ? YOUR ANSWER : ?