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Mr. Dubey • 52.30K Points
Coach 

Q. For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then,

(A) x/r and l/d are both small
(B) x/r is large but l/d is small
(C) x/r is small but l/d is large
(D) x/r and l/d are both large
Correct : Option (C)

Explanation: 
 small x/r gives linear speed torque characteristic. large l/d gives less inertia and good acceleration characteristic.

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