# Electrical Engineering: Control system MCQ

##### 21. Question

The positive, negative and zero sequence impedances of a three phase generator are Z_{1} , Z_{2} and Z_{0} respectively. For a line-to-line fault with fault impedance Z_{f} ,the fault current is I_{f1} = kI_{f . }where I f is the fault current with zero fault impedance. The relation between Z_{f} and k is

Answer

##### 22. Question

Consider a unity feedback system with forward transfer function given by

G(S)= 1/(s+1)(s+2)

The steady-state error in the output of the system for a unit-step input is _________(up to 2 decimal places).

Answer

##### 23. Question

A continuous-time input signal x(t) is an eigenfunction of an LTI system, if the output is

t x(t) , where k ise^{jωt}

an eigenvalue and is complex exponential signal

, wheree^{jωt}

is a complex exponential signal

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##### 24. Question

The graph of a network has 8 nodes and 5 independent loops. The number of branches of the graph is

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##### 25. Question

A system transfer function is

If a 1 = b 1 = 0, and all other coefficients are positive, the transfer function represents a

Answer