Modelling and Block Diagrams

Question 1

If we have functions in series, what is the overall transfer function?

Answer 1

It’s the product of each individual function

Question 2

What is the overall function if we have systems in parallel?

Answer 2

It’s the sum of the functions

Question 3

Y(s) is the output function of the system
R(s) is the input function of the system
G(s) is the initial transfer function of the system
H(s) is the transfer function of the negative feedback loop of the system

What is the overall transfer function of the system?

Answer 3

G(s) / (1 + G(s) * H(s))

Question 4

What is the value of the transfer function of a unity negative feedback system?

Answer 4

G(s) / (1 + G(s))

Question 5

What is the difference between the standard transfer functions of a positive feedback and a negative feedback?

Answer 5

Positive has a negative function in the denominator

Negative has a positive function in the denominator