The advantage of mercury arc rectifier is that it has high efficiency it is comparatively noiseless All of the listed here it is light in weight and occupies small floor space TRUE ANSWER : ? YOUR ANSWER : ?
A rotary converter operates at a zero power factor low power factor high power factor None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable 75, 85 20, 30 40, 50 30, 60 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 : ?
Which of the following metals is generally manufactured by electrolysis process? Aluminium Zinc Copper Load TRUE ANSWER : ? YOUR ANSWER : ?
In a mercury arc rectifier positive ions are attracted towards mercury pool cathode shell bottom anode TRUE ANSWER : ? YOUR ANSWER : ?
On which of the following factors the number of phases for which a rectifier should be designed depends? The power factor of the system should be high All of the listed here In the output circuit there should be no harmonics The voltage regulation of the rectifier should be low TRUE ANSWER : ? YOUR ANSWER : ?
In phase-shift control method the control is carried out by varying the of grid voltage. magnitude polarity All of the listed here phase TRUE ANSWER : ? YOUR ANSWER : ?
The efficiency of the copper oxide rectifier seldom exceeds 65 to 75% 90 to 95% 80 to 85% 85 to 90% TRUE ANSWER : ? YOUR ANSWER : ?
A rotary converter is a single machine with one armature and one field one armature and two fields two armatures and one field none of the listed here TRUE ANSWER : ? YOUR ANSWER : ?