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

Related MCQs

• The density of hydrogen is _____ times the density of air.
• The thermal conductivity of hydrogen is ______ times that of air
• The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
• The mcrease in heat dissipation by air blasts is due to increase in
• Which ofthe following is an advantage of hydrogen cooling ?
• With conventional hydrogen cooling it is possible to increase the rating of a single unit to
• In direct cooled system using hydrogen both stator and rotor conductors are made
• The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
• On which of the following variables heat convected depends ?
• The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ?