Condition for zero voltage regulation is-

A tanφ = X/R

B tanφ = R/X

C cosφ = X/R

D cosφ = R/X

Solution

Correct Answer: Option B

Zero voltage regulation সাধারণত leading power factor-এর ক্ষেত্রে ঘটে।
Leading power factor-এর জন্য voltage regulation এর সমীকরণ হলো: VR ≈ I(Rcosφ - Xsinφ) / V
Zero voltage regulation এর জন্য, Rcosφ - Xsinφ = 0 হতে হবে।
⇒ Rcosφ = Xsinφ
⇒ sinφ / cosφ = R / X
tanφ = R/X

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