Deck 3: Control Systems

Question 1

is the reference input minus the primary feedback.

A)manipulated variable
B)zero sequence
C)actuating signal
D)primary feedback

Answer 1

actuating signal

Question 2

With feedback _____ increases.

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

Answer 2

system stability

Question 3

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

Answer 3

unit impulse input signal

Question 4

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 5

Spring constant in force-voltage analogy is analogous to

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

Question 6

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 7

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 8

specified ________ input signal.

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

Question 9

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 10

The type 0 system has ______ at the origin.

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

Question 11

The type 1 system has ______ at the origin.

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

Question 12

The type 2 system has ______ at the origin.

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

Question 13

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

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

Question 14

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 15

In case of type-1 system steady state acceleration is

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

Question 16

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 17

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 18

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 19

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 20

technique is not applicable to nonlinear system ?

A)nyquist criterion
B)quasi linearization
C)functional analysis
D)phase-plane representation

Question 21

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)

Question 22

The phase lag produced by transportation relays

A)is independent of frequency
B)is inverseh'proportional to frequency
C)increases linearly with frequency
D)decreases linearly with frequency

Question 23

Which of the following can be measured by the use of a tachogenerator ?

A)acceleration
B)speed
C)speed and acceleration
D)displacement

Question 24

is not a final control element.

A)control valve
B)potentiometer
C)electropneumatic converter
D)servomotor

Question 25

Which of the following is the definition of proportional band of a controller ?

A)the range of air output as measured variable varies from maximum to minimum
B)the range of measured variables from set value
C)the range of measured variables through which the air output changes from maximum to minimum
D)any of the above