Electronics and Communication Engineering - Automatic Control Systems - Discussion

Discussion Forum : Automatic Control Systems - Section 1 (Q.No. 14)

Automatic Control Systems

14.

In the given figure, the input frequency is such that R = X_C. Then

v₀ lags v_i by 45°

v₀ lags v_i by 90°

v₀ leads v_i by 45°

v₀ leads v_i by 90°

Answer: Option

Explanation:

R = X_C, voltage drops across R and X_C are equal and at 90° with respect by each other. V₀ lags V_i by 45°.

Discussion:

7 comments Page 1 of 1.

Santosh Gupta said: 4 years ago

Thanks @Pranoti.

James said: 7 years ago

You are right @Pranoti.

Asd said: 10 years ago

Why 45?

Pranoti said: 1 decade ago

tan-1(xc/r) = tan-1(xc/xc) = 45. As it is capacitive reactants voltages vi.

Agrawal said: 1 decade ago

So if we use inductor then it will lead by 45?

Manikanta said: 1 decade ago

The reactance of capacitor is Xc=1/jwc, which will gives a negative (lagging) phase angle.

Suraj said: 1 decade ago

Why it will be lagging?

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