# Electrical Engineering: Control system MCQ

## Getting Started with Electrical Engineering: Power system MCQ:

##### 1. Question

The open loop transfer function of a unity feedback control system is given by

G(S) =K(s+1) / s(1+Ts)(1+2s) K> 0,T> 0

The closed loop system will be stable if,

Answer

##### 2. Question

A second-order real system has the following properties:

a) the damping ratio ζ= 0.5 and undamped natural frequency ω_{n}=10 rad/s,

b) the steady state value of the output, to a unit step input, is 1.02.

The transfer function of the system is

^{2}+5s+ 100

^{2}+10s+ 100

^{2}+10s+ 100

^{2}+5s+ 100

Answer

##### 3. Question

The gain at the breakaway point of the root locus of a unity feedback system with open loop

transfer function G ( s ) = Ks/(s-1(s-4) is

Answer

##### 4. Question

The impulse response g(t) of a system, G, is as shown in figure (a). What is the maximum value attained by the impulse response of two cascaded blocks of G as shown in figure (b)?

Answer

##### 5. Question

For the signal-flow graph shown in the figure, which one of the following expressions is equal to the transfer function Y(s) / X_{2}(s)|_{x1(s)=0 ?}

_{}

_{1}/ [1+G_{2}(1+G_{1})]

_{2} / [1+G_{1}(1+G_{2})]

_{1}/1+G_{1}G_{2}

_{2}/1+G_{1}G_{2}

Answer