if I understand your question correctly the answer is: Not at all. We have to know more about the circuit.
Take for example the (electronic) ignition circuit of a combustion engine: Regardless of the number of revolutions, duration and voltage of the output pulses are always the same. So, the duty cycle increases with increasing speed but the voltage (resp. the ratio of output to input voltage) does not. (O.k., the mean output voltage increases but you could change the voltage also by changing the ignition coil without altering the duty cycle.)
BTW: Never trust automatic subject generators: I guess "Transfer (Psychology)" (as your question is labeled) is not what you would prefer.
Habib M. N. Ahmad we can easily find the voltage in terms of duty cycle or vice versa....but how can we find duty cycle with the help of transfer function?
You can simply calculate the duty cyle of any converter according to its state space representation, you could check my publication as an exemple for the buck boost converters
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