24/08/2022

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. 

13/08/2022

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.

09/08/2022

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. 

06/08/2022

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. 

04/08/2022

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.