The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

Related Mcqs:

Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?

A. Copper oxide rectifiers B. Selenium rectifiers C. Mercury arc rectifiers D. Mechanical rectifiers E. None of the above...

In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as______________?

A. maximum grid voltage B. critical grid voltage C. any of the above D. none of the above...

In a three-phase mercury arc rectifiers each anode conducts for____________?

A. one-third of a cycle B. one-fourth of a cycle C. one-half a cycle D. two-third of a cycle...

The ionization potential of mercury is approximately_____________?

A. 5.4 V B. 8.4 V C. 10.4 V D. 16.4 V...

In a rotary converter armature currents are______________?

A. d.c. only B. a.c. only C. partly a.c. and partly d.c....