Switch Reluctance Motor ( SRM ) Interview Question Answer - II

Explain the term : Torque ripple
Torque ripple
  • It is defined as the difference between the maximum and minimum instantaneous torque during steady state condition. 
  • It is expressed as percentage of the average torque.

Give reason : There is no shoot through fault in the SRM.

Shoot Through Fault

  • The SRM power converter consists of one power switch is connected in series with phase wining across DC supply. 


Safety Provisions For Electric Vehicle Charging Stations


Following safety provisions are applied to electric vehicle charging stations

  • Protection against overload of input supply and output supply fittings
  • Electric vehicle charging point shall be installed so that any socket outlet of supply is at least 800 millimeter above the finished ground level.
  • A cord extension shall not be used in addition to supply lead for the connection of electric vehicle to the electric vehicle charging point.


Hydrogen Fuel Transportation

 Hydrogen Production – Centralized / Decentralized

  • Hydrogen is produced either in a centralized or decentralized manner, but transportation is key point. 
  • The cost of hydrogen generation is lower due to economies of scale but transmission and distribution costs are higher in the centralized production. 


Earthing Protection For E Vehicle Charging Stations


Earth protection system for E Vehicle Charging stations

According to Central Electrical Authority notification, 2019 earth protection system for the all the electrical vehicle charging stations

  • All residual current device of the protection of supplies for electric vehicle shall

       ( a ) Have residual operating current not greater than 30 mA

India's Hydrogen Energy Roadmap : Vision - 2020

  • The nation hydrogen energy roadmap was laid in the year 2006 to provide blueprint for the long-term public and private efforts required for hydrogen energy development in the country. 
  • The roadmap identify technology gaps and challenges for introduction of hydrogen in large scale in different phase manner. 


Hydrogen As Fuel | Future of Hydrogen

  • As energy demand is rising day by day, hydrogen is promising energy carrier. 
  • It is non-polluting, efficient and clean fuel which could be used for most of the energy sectors like the conventional fuel or like electricity and provide energy to the nation. 

Fuel Cell : Hydrogen Production & Applications


Hydrogen production, storage, transportation and applications

  • The current global demand of hydrogen is 70 million metric ton per year in terms of energy it is around 330 million. 
  • Most of the hydrogen is produced from fossil fuels ( 76% form natural gas, 23% from coal and remaining from electrolysis of water ) which consumes 6% of global natural gas and 2% of global coal, result in CO2 emission of 830 Mt per year.