Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?

Related Mcqs:

Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?

A. small size machines B. medium size machines C. large size machines D. any of the above...

Materials exhibiting zero value of resistivity are known as ____________ ?

A. conductors B. semiconductors C. insulators D. superconductors...

The slot leakage can be calculated by making which of the following assumptions ?

A. The current in the slot conductors is uniformly distributed over their cross-section B. The leakage path is straight across the slot and around the iron at the bottom C. The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero D. All of the above...

Which of the following brushes can be used for high values of current density ?

A. Metal graphite brushes B. Hard carbon brushes C. Electro-graphitic brushes D. Natural graphite brushes...

The forced oil and air circulation method is usual one for transformers of capacities____________?

A. upto 5 MVA B. upto 10 MVA C. upto 20 MVA D. 30 MVA upwards...