Question 1

From which of the following transfer function can be obtained ?

Accepted Answer

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

Question 2

In case of type-1 system steady state acceleration is

Accepted Answer

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

Question 3

Spring constant in force-voltage analogy is analogous to

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

is the reference input minus the primary feedback.

Accepted Answer

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

Question 6

The type 0 system has ______ at the origin.

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

In a system zero initial condition means that

Accepted Answer

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 11

The transfer function is applicable to which of the following ?

Accepted Answer

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

Question 12

The type 1 system has ______ at the origin.

Accepted Answer

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

Question 13

technique is not applicable to nonlinear system ?

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

With feedback _____ increases.

Accepted Answer

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

Question 18

A conditionally stable system exhibits poor stability at

Accepted Answer

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

Question 19

In a system low friction co-efficient facilitates

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 3: Control Systems