Deck 3: Control Systems

Question 1

A signal other than the reference input that tends to affect the value of controlled variable is known as

A)disturbance
B)command
C)control element
D)reference input

Answer 1

disturbance

Question 2

The transfer function is applicable to which of the following ?

A)Linear and time-in variant systems
B)Linear and time-variant systems
C)Linear systems
D)Non-linear systems

Answer 2

Linear and time-in variant systems

Question 3

From which of the following transfer function can be obtained ?

A)Signal flow graph
B)Analogous table
C)Output-input ratio
D)Standard block system

Answer 3

Signal flow graph

Question 4

is the reference input minus the primary feedback.

A)Manipulated variable
B)Zero sequence
C)Actuating signal
D)Primary feedback

Question 5

With feedback _____ increases.

A)system stability
B)sensitivity
C)gain
D)effects of disturbing signals

Question 6

By which of the following the system response can be tested better ?

A)Ramp input signal
B)Sinusoidal input signal
C)Unit impulse input signal
D)Exponentially decaying signal

Question 7

In a system zero initial condition means that

A)The system is at rest and no energy is stored in any of its components
B)The system is working with zero stored energy
C)The system is working with zero reference signal

Question 8

In a system low friction co-efficient facilitates

A)reduced velocity lag error
B)increased velocity lag error
C)increased speed of response
D)reduced time constant of the system

Question 9

Spring constant in force-voltage analogy is analogous to

A)capacitance
B)reciprocal of capacitance
C)current
D)resistance

Question 10

The frequency and time domain are related through which of the following?

A)Laplace Transform and Fourier Integral
B)Laplace Transform
C)Fourier Integral
D)Either (b) or (c)

Question 11

An increase in gain, in most systems, leads to

A)smaller damping ratio
B)larger damping ratio
C)constant damping ratio
D)none of the above

Question 12

Static error co-efficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal.

A)acceleration
B)velocity
C)position
D)all of the above

Question 13

A conditionally stable system exhibits poor stability at

A)low frequencies
B)reduced values of open loop gain
C)increased values of open loop gain
D)none of the above

Question 14

The type 0 system has ______ at the origin.

A)no pole
B)net pole
C)simple pole
D)two poles

Question 15

The type 1 system has ______ at the origin.

A)no pole
B)net pole
C)simple pole
D)two poles

Question 16

The type 2 system has at the origin.

A)no net pole
B)net pole
C)simple pole
D)two poles

Question 17

The position and velocity errors of a type-2 system are

A)constant, constant
B)constant, infinity
C)zero, constant
D)zero, zero

Question 18

Velocity error constant of a system is measured when the input to the system is unit _______ function.

A)parabolic
B)ramp
C)impulse
D)step

Question 19

In case of type-1 system steady state acceleration is

A)unity
B)infinity
C)zero
D)10

Question 20

If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is

A)not necessarily stable
B)stable
C)unstable
D)always unstable

Question 21

Which of the following is the best method for determining the stability and transient response ?

A)Root locus
B)Bode plot
C)Nyquist plot
D)None of the above

Question 22

Phase margin of a system is used to specify which of the following ?

A)Frequency response
B)Absolute stability
C)Relative stability
D)Time response

Question 23

Addition of zeros in transfer function causes which of the following ?

A)Lead-compensation
B)Lag-compensation
C)Lead-lag compensation
D)None of the above

Question 24

technique is not applicable to nonlinear system ?

A)Nyquist Criterion
B)Quasi linearization
C)Functional analysis
D)Phase-plane representation

Question 25

In order to increase the damping of a badly underdamped system which of following compensators may be used ?

A)Phase-lead
B)Phase-lag
C)Both (a) and (b)
D)Either (a) and (b)