Hydrogen has a heat transfer co-efficient __________ times that of air?

Related Mcqs:

impose limitation on design____________?

A. Saturation B. Temperature rise C. Efficiency D. Power factor E. All above...

Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?

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

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...

Power transformers should be designed to have maximum efficiency________________?

A. at one-fourth load B. at one-half load C. at or near full load D. any of the above...

Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?

A. Increased I R losses B. Increased core losses C. Poor commutation D. Change in motor parameters E. All of the above...