Q : Why did the armies of the British East India Company - mostly comprising of Indian soldiers-win consistently against the more numerous and better equipped armies of the then Indian rulers ? Give reasons.

Intro : 

The British East India Company (EIC) defeated larger Indian armies through military and political superiority. Despite consisting mostly of Indian soldiers, the EIC forces won due to advanced tactics, discipline and leadership.

Body

Reasons for the victory of the East India Company:

1. Unified Command: The EIC had unified, centralized and highly organized command over its forces. 
2. Latest Technology: EIC had weapons of latest technology. They even used the best naval forces in the Indian coastal princely states.
3. Single Purpose: The sole purpose of the British EIC was to control trade and economic interest. 
4. External support and good leadership: The British Parliament and the Crown supported the EIC's war efforts. Leaders like Robert Clive, Warren Hasting, Cornwallis also helped.
5. British Policies: The Subsidiary Alliance or Ring of Fence helped the British to remove Indian rulers.
6. Permanent nature of armies: The EIC had a standing army while the soldiers of the Indian rulers worked in the fields during peace times.

Conclusion

Other factors that helped the British included infighting among Indian rulers, a good network of espionage by the EIC and betrayal of Indian rulers by local people (for example Ghasiti Begum or Omi Chand in the Battle of Plassey).