Block Diagram can be used to represent:

• Only linear systems

• Only non-linear systems

• only time-variant systems

• time-invariant as well as time-variant

Signal flow graphs can be used to represent:

• Only linear systems

• Only non-linear systems

• only time-variant systems

• time-invariant as well as time-variant

Which system is also known as automatic control system?

• open loop control system

• Closed loop control system

• both 1 & 2

• None of these

In open loop system____

• the control action depends on the size of the system

• the control action depends on system variables

• the control action depends on the input signal

• the control action is independent of the output

A control system in which the control action is somehow dependent on the output is known as

• Open loop system

• Semiclosed loop system

• Closed loop system

• None of the above

With feedback _______ increases

• system stability

• sensitivity

• gain

• effects of disturbing signals

Reference input minus the primary feedback is called ________ signal

• Manipulated variable

• Error signal

• Zero signal

• Primary feedback

The roots of the denominator polynomial of the transfer function are called:

• ZEROS

• POLES

• SINGULARS

• PLURALS

A third-order system will have:

• 3 poles

• 3 zeros

• 1 Zero and 2 poles

• 1 pole and 2 zeros

Transfer function is the ratio of

• Laplace transform of output to input

• Laplace transform of output to Laplace transform of input.

• Laplace transform of output to Laplace transform of input assuming all initial condition zero.

• Output to Laplace transform of input.