In a three-phase mercury arc rectifiers each anode conducts for? Mark as favorite Copy Link one-third of a cycle one-fourth of a cycle one-half a cycle two-third of a cycle Check Answer
The internal efficiency of a mercury arc rectifier depends on? Mark as favorite Copy Link voltage only current only voltage and current r.m.s. value of current Check Answer
Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of? Mark as favorite Copy Link 100 A at 100 V 200 A at 200 V 300 A at 300 V 500 A at 500 V Check Answer
A rotary converter in general construction and design, is more or less like? Mark as favorite Copy Link a transformer an induction motor an alternator any dc machine Check Answer
A rotary converter combines the function of? Mark as favorite Copy Link an induction motor and a D.C. generator a synchronous motor and a DC generator a D.C. series motor and a D.C. generator none of the above Check Answer
In selenium rectifiers efficiencies ranging from to percent are attainable? Mark as favorite Copy Link 25, 35 40, 50 60, 70 75, 85 Check Answer
The efficiency of an electrolytic rectifier is nearly? Mark as favorite Copy Link 80% 70% 60% 40% Check Answer
In a glass bulb mercury arc rectifier the maximum current rating is restricted to? Mark as favorite Copy Link 2000 A 1500 A 1000 A 500 A Check Answer
When a rectifier is loaded which of the following voltage drops take place? Mark as favorite Copy Link Voltage drop in transformer reactance Voltage drop in resistance of transformer and smoothing chokes Arc voltage drop All of the above Check Answer
The efficiency of the copper oxide rectifier seldom exceeds? Mark as favorite Copy Link 90 to 95% 85 to 90% 80 to 85% 65 to 75% Check Answer