In which of the following appUcations, direct current is absolutely essential ?

Related Mcqs:

In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?

A. 25, 35 B. 40, 50 C. 60, 70 D. 75, 85...

The efficiency of an electrolytic rectifier is nearly____________?

A. 80% B. 70% C. 60% D. 40%...

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

A. is directly proportional to load B. is inversely proportional to load C. varies exponentially with the load current D. is almost independent of load current...

In a mercury arc rectifier positive ions are attracted towards______________?

A. anode B. cathode C. shell bottom D. mercury pool...

A synchronous converter can be started______________?

A. by means of a small auxiliary motor B. from AC. side as induction motor C. from D.C. side as D.C. motor D. any of the above methods E. none of the above methods...