घूर्णन करने वाली विद्युत मशीनों में विंडेज हानियाँ (Windage losses) मुख्य रूप से किसके कारण होती हैं?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?