CONTROL SYTSTEMS

 The most commonly used input signal(s) in control system is 

a)step function

b) ramp or velocity dunction

c) accelerating funtion

d) all of the above

ANS: a

What is the characteristic of a good control system

a)Sensitive to parameter variation

b)insensitive to input commands

c)Neither sensitive to parameter variation nor sensitive to input commands

d)Insensitive to parameters variation but sensitive to input commands

ANS d

The system described by the equation y=a+bx ,a>  0,b > 0 is

a)dynamic 

b)Linear

c)Nonlinear

d) Time-Varying

ANS:b

Linear system obeys

a)principle of maximum power transfer

b)reciprocity principal

c)principle of superposition

d)All of these 

ANS:d

A System can be Completely described by a transfer function if it is 

a)Nonlinear and continuous 

b)Linear and time-varying

c)Nonlinear and time-invariant

d)linear and time-invariant 

ANS:d

Compared to continuous time system,the discrete system is

a)more accurate but less stable

b)Less accurate but more stable

c)More accurate and more stable

d)Less accurate and less stable

ANS:c

If a linear time invariant system is excited by true random signal like white noise,the output of the linear system will have which of the following properties ?

a)Output will be a white noise

b)Output will be periodic 

c)Output will not be random

d)Output will be correlated or coloured noise

ANS:c

A function of one or more variables which conveys information on the nature of physical phenimenon is called

a) noise

b)interference 

c)system

d)signal

ANS:d

If the initial conditions for a system are inherently zero,what does it physically mean

a) The system is at rest but stores energy

b)The system is working but does not store energy

c)the system is at rest or no energy is stored in any of its parts

d)The system is working with zero reference input

ANS:d

In a Control system ,the use of negative feedback

a)eliminates the chances of instability

b)increases the reliability

c)reduce the effects of disturbance and noise signal in the forward path 

d)increases the influence of variations of component parameters on the system performance

ANS:c