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The transfer function of a compensating network is of the form (1 + α Ts)/ (1 + Ts). If this is a phase-lag network, the value of α should be—
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- exactly equal to 0
- between 0 and 1
- exactly equal to 1
- greater than 1.
- exactly equal to 0
Correct Option: B
| Given | = | ||
| Vi(s) | (1 + sT) |
The output leads to the input by an angle
| φ = tan–1 |  |  | - tan–1(T) | |
| 1 |
If α is > 1, φ is positive and if 0 < α < 1 then φ becomes negative meaning that output will lag the input by φ. Since the given function is to represent a phase lag network, so α should be between 0 and 1.
