In which of the following equipment direct current is needed ?

Related Mcqs:

Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?

A. Mechanical rectifiers B. Copper oxide rectifiers C. Selenium rectifiers D. Electrolytic rectifiers E. Mercury arc rectifiers...

In a mercury arc rectifier, the anode is usually made of_____________?

A. copper B. aluminium C. silver D. graphite E. tungsten...

The efficiency of an electrolytic rectifier is nearly____________?

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

The ionization potential of mercury is approximately_____________?

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

A rotary converter combines the function of____________?

A. an induction motor and a D.C. generator B. a synchronous motor and a D.C. generator C. a D.C. series motor and a D.C. generator D. none of the above...