वेरिएबल फ्रीक्वेंसी ड्राइव (VFD) का उपयोग मुख्य रूप से औद्योगिक मोटर अनुप्रयोगों में किया जाता है जहाँ निम्नलिखित में से किसकी आवश्यकता होती है?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?