Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as
(A) One-third of their synchronous speed
(B) One-fifth of their synchronous speed
(C) One-seventh of their synchronous speed
(D) One-ninth of their synchronous speed
(A) One-third of their synchronous speed
(B) One-fifth of their synchronous speed
(C) One-seventh of their synchronous speed
(D) One-ninth of their synchronous speed