To produce cathode spot in a mercury arc rectifier______________?

Related Mcqs:

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

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

In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of______________?

A. shunt motor B. synchronous motor C. induction regulator D. synchronous generator...

When a rectifier is loaded which of the following voltage drops take place ?

A. Voltage drop in transformer reactance B. Voltage drop in resistance of transformer and smoothing chokes C. Arc voltage drop D. All of the above...

The potential drop in the arc, in a mercury arc rectifier, varies_____________?

A. 0.05 V to 0.2 V per cm length of the arc B. 0.5 V to 1.5 V per cm length of the arc C. 2 V to 3.5 V per cm length of the arc D. none of the above...

Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?

A. Motor-generator set B. Motor converter C. Rotary converter D. Mercury arc rectifier...