1
All of the following are properties of nonlinear dynamic systems EXCEPT:
Choose one answer.
a. Linear systems do not satisfy superposition.
b. Linear systems do not satisfy homogeneity.
c. Linear systems have one equilibrium point at origin.
d. Linear systems have many equilibrium points at origin.
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Question 2
Fill in the blank. As the damping ratio ______________, the percentage overshoot ________________.
Choose one answer.
a. Increases, decreases
b. Increases, increases
c. Increases, remains unchanged
d. reRmains unchanged, increases
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Question 3
Fill in the blank. Laplace transformations use the __________ variable?
Choose one answer.
a. "t"
b. "s"
c. "d"
d. "g"
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Question 4
Fill in the blank. Damping ratio generally varies from ________________.
Choose one answer.
a. 0 to 5
b. 0 to 1
c. 1 to 10
d. 0 to 0.1
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Question 5
Fill in the blank. Poles of a system are obtained by setting the _______________ of the transfer function to zero.
Choose one answer.
a. Numerator
b. Denominator
c. Natural frequency
d. Gain
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Question 6
Fill in the blank. Voltage in electrical systems is analogous to _______________ in fluid systems.
Choose one answer.
a. Flow
b. Pressure
c. Current
d. Torque
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Question 7
Gain of a second order dynamic system exhibits which of the following?
Choose one answer.
a. How much the system oscillates
b. How fast the system oscillates
c. Size of steady state response
d. None of the above
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Question 8
How many poles will a second order system have?
Choose one answer.
a. One
b. Two
c. Three
d. Four
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Question 9
How many types of electric power source are there in electrical systems?
Choose one answer.
a. Two
b. Three
c. Four
d. Five
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Question 10
Natural frequency of a second order dynamic system exhibits which of the following?
Choose one answer.
a. How much the system oscillates
b. How fast the system oscillates
c. Size of steady state response
d. None of the above
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Question 11
Plots of second order dynamic system exhibit which of the following?
Choose one answer.
a. Natural frequency
b. Overshoot
c. Gain
d. All of the above
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Question 12
Pole location in dynamic systems is a function of which of the following?
Choose one answer.
a. Natural frequency
b. Damping ratio
c. Gain
d. None of the above
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Question 13
The damping ratio of a second order dynamic system exhibits which of the following?
Choose one answer.
a. How much the system oscillates
b. How fast the system oscillates
c. Size of steady state response
d. None of the above
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Question 14
Which of the following applies to a transfer functions?
Choose one answer.
a. A transfer function is ratio of transform of input to transform of output.
b. A transfer function is ratio of transform of output to transform of input.
c. Both A and B
d. None of the above
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Question 15
Which of the following are common signals for dynamic systems?
Choose one answer.
a. Impulse
b. Step
c. Both A and B
d. None of the above
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Question 16
Which of the following are components of electrical systems?
Choose one answer.
a. Capacitor
b. Inductor
c. Resistor
d. All of the above
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Question 17
Which of the following can be considered a second order dynamic system?
Choose one answer.
a. Overdamped
b. Underdamped
c. Undamped
d. All of the above
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Question 18
Which of the following does second order dynamic systems exhibit?
Choose one answer.
a. Oscillations
b. Overshoot
c. Both A and B
d. None of the above
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Question 19
Which of the following inputs are generally used as test inputs to dynamic systems?
Choose one answer.
a. Ramp input
b. Step input
c. Constant input
d. None of the above
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Question 20
Which of the following is an example of static dynamic system?
Choose one answer.
a. Gear train
b. Four-bar linkage
c. Transformer
d. All of the above
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Question 21
Which of the following is NOT a characteristic of transfer function?
Choose one answer.
a. Transfer function applies to nonlinear system.
b. Transfer function applies to stationary systems.
c. During transfer function, computation all initial conditions are assumed as zero.
d. Transfer function describes input-output dynamics.
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Question 22
Which of the following is NOT a method of modeling electrical systems?
Choose one answer.
a. Loop method
b. Node method
c. Complex impedances
d. Perimeter method
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Question 23
Which of the following is NOT a property of linear dynamic systems?
Choose one answer.
a. Linear systems satisfy superposition.
b. Linear systems satisfy homogeneity.
c. Linear systems have two equilibrium points at origin.
d. Linear systems have one equilibrium point at origin.
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Question 24
Which of the following regarding input variables of dynamic systems is false?
Choose one answer.
a. Input variables originate outside the system.
b. Input variables originate inside the system.
c. Input variables are not affected by what happens in a system.
d. All of the above
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Question 25
Which of the following regarding output variables of dynamic systems is true?
Choose one answer.
a. Output variables are not influenced by input variables.
b. Output variables do not regulate the system.
c. Output variables do not monitor the system.
d. Output variables are influenced by input variables.
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Question 26
Fill in the blank. A dynamic system at a minimum has ______________ sets of variables.
Choose one answer.
a. Two
b. Three
c. Four
d. Five
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Question 27
Bode' plots are based on which of the following?
Choose one answer.
a. Time
b. Frequency
c. Both A and B
d. None of the above
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Question 28
Decibels in Bode' plot is used to measure which of the following?
Choose one answer.
a. Power gain
b. Phase
c. Margin
d. Percentage overshoot
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Question 29
Fill in the blank. A system is less stable if the gain margin is close to _______.
Choose one answer.
a. 0
b. 1
c. -1
d. 2
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Question 30
Fill in the blank. An increase of frequency by a factor of ___________ is called Decade.
Choose one answer.
a. 2
b. 4
c. 8
d. 10
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Question 31
Fill in the blank. An increase of frequency by a factor of ____________ is called Octave.
Choose one answer.
a. 2
b. 4
c. 8
d. 10
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Question 32
Fill in the blank. Gain margin is just the amount of gain that you can add to move the zero db crossing to occur at the same frequency as the _________ degrees crossing.
Choose one answer.
a. 0
b. 180
c. 360
d. -180
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Question 33
Fill in the blank. In Bode' plot frequency is plotted in __________________.
Choose one answer.
a. Decibels
b. Logarithmic scale
c. Degrees
d. Percentage overshoot
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Question 34
Fill in the blank. In Bode' plot magnitude is plotted in ________________.
Choose one answer.
a. Decibels
b. Logarithmic scale
c. Degrees
d. Percentage overshoot
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Question 35
Fill in the blank. In Bode' plot phase is plotted in _________________.
Choose one answer.
a. Decibels
b. Logarithmic scale
c. Degrees
d. Percentage overshoot
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Question 36
Fill in the blank. Root Locus of a system has _____________ number of branches compared to open loop poles.
Choose one answer.
a. More
b. Less
c. The same
d. Zero
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Question 37
Fill in the blank. Steady state error ______________when the loop gain ______________.
Choose one answer.
a. Increases, decreases
b. Increases, increases
c. Increases, remains unchanged
d. Remains unchanged, increases
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Question 38
Fill in the blank. The percent overshoot is generally measured for ______________ peak.
Choose one answer.
a. First
b. Second
c. Third
d. Fourth
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Question 39
If the response to step input is 0.9 and the error is 0.1, the system is said to have what percent steady state error?
Choose one answer.
a. 6 percent
b. 8 percent
c. 10 percent
d. 12 percent
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Question 40
If the system poles are at the origin, the system is said to have what percent steady state error?
Choose one answer.
a. 1 percent
b. 0.05 percent
c. 10 percent
d. 0 percent
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Question 41
Root Locus of a first order system has how many branches?
Choose one answer.
a. 0
b. 1
c. 2
d. 3
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Question 42
Root Locus of a second order system has how many branches?
Choose one answer.
a. 0
b. 1
c. 2
d. 3
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Question 43
The distance of poles from the origin of a dynamic system gives which of the following?
Choose one answer.
a. Frequency of oscillations
b. Reciprocal of time constant
c. Undamped natural frequency
d. None of the above
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Question 44
The horizontal location of poles of a dynamic system gives which of the following?
Choose one answer.
a. Frequency of oscillations
b. Reciprocal of time constant
c. Undamped natural frequency
d. None of the above
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Question 45
The vertical location of poles of a dynamic system gives which of the following?
Choose one answer.
a. Frequency of oscillations
b. Reciprocal of time constant
c. Undamped natural frequency
d. None of the above
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Question 46
To evaluate steady state error, which of the following input signal is commonly used?
Choose one answer.
a. Impulse
b. Step
c. Ramp
d. Random
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Question 47
Where does Root Locus begin?
Choose one answer.
a. At open loop zeros
b. At closed loop zeros
c. At open loop poles
d. At closed loop poles
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Question 48
Where does Root Locus end?
Choose one answer.
a. At open loop zeros
b. At closed loop zeros
c. At open loop poles
d. At closed loop poles
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Question 49
Which of the following about Nyquist plots is true?
Choose one answer.
a. A Nyquist plot uses the same plot to display amplitude and phase.
b. A Nyquist plot cannot depict if a system is stable or unstable.
c. Both A and B
d. None of the above
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Question 50
Which of the following are measures of relative stability of systems?
Choose one answer.
a. Phase margin
b. Gain margin
c. Both A and B
d. None of the above
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Question 51
Which of the following best describes steady state error?
Choose one answer.
a. Difference between input and measured varying output
b. Difference between input and measured constant output
c. Difference between measured constant input and measured varying output
d. None of the above
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Question 52
Fill in the blank. As the damping ratio reaches around ______________ the overshoot cannot be observed.
Choose one answer.
a. 0.2
b. 0.4
c. 0.6
d. 0.8
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Question 53
Compensation control techniques use which of the following?
Choose one answer.
a. Phase lead
b. Phase lag
c. Integration
d. All of the above
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Question 54
Compensation control techniques use which of the following?
Choose one answer.
a. Phase lead
b. Phase lag
c. Integration
d. All of the above
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Question 55
Controller design using frequency is based on which of the following?
Choose one answer.
a. Open-loop time response
b. Closed-loop time response
c. Open-loop frequency response
d. Closed-loop frequency response
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Question 56
Fill in the blank. If the error signal is _________, then the output of the integrator stays constant.
Choose one answer.
a. 0.1
b. 1
c. 2
d. 0
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Question 57
Fill in the blank. In proportional control systems, the measured output is _____________ the input signal to form the error signal.
Choose one answer.
a. Added to
b. Subtracted from
c. Multiplied with
d. Divided by
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Question 58
Fill in the blank. In proportional control systems, if the sensor gain is ________, then the output is equal to input.
Choose one answer.
a. 1
b. 0.1
c. 2
d. 0.01
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Question 59
Fill in the blank. Lead compensation is equivalent to ________ control?
Choose one answer.
a. P
b. D
c. PD
d. PID
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Question 60
Fill in the blank. Many open-loop systems have high magnitude (gain) at natural frequency equal to _________________.
Choose one answer.
a. Zero
b. One
c. Infinity
d. Ten
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Question 61
Fill in the blank. Many open-loop systems have low magnitude (gain) at natural frequency equal to _________________.
Choose one answer.
a. Zero
b. One
c. Infinity
d. Ten
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Question 62
Fill in the blank. Steady state error is also known as ____________ error.
Choose one answer.
a. AC
b. DC
c. On-Off
d. Integral
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Question 63
Fill in the blank. The primary objective of lead compensation is to increase ________________ near crossover frequency?
Choose one answer.
a. Phase margin
b. Gain margin
c. Natural frequency
d. Overshoot
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Question 64
For a stable integral control system, what is the steady state error?
Choose one answer.
a. 0.1
b. 0.01
c. 0
d. 1
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Question 65
In control systems, the device which measures what the system is doing is also known as which of the following?
Choose one answer.
a. Sensor
b. Input
c. Plant
d. None of the above
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Question 66
In control systems, the system to be controlled is also known as which of the following?
Choose one answer.
a. Sensor
b. Input
c. Plant
d. None of the above
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Question 67
In integral control, which of the following is proportional to the integral of the error?
Choose one answer.
a. Input
b. Output
c. Control effort
d. Response
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Question 68
In proportional control systems, the control effort is proportional to which of the following signals?
Choose one answer.
a. Input
b. Measured input
c. Output
d. Error
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Question 69
Many heating systems use what type of control?
Choose one answer.
a. Proportional control
b. Integral control
c. On-Off control
d. Derivative control
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Question 70
Pre-filters are generally used to cancel which of the following?
Choose one answer.
a. Zeros
b. Poles
c. Gain
d. Phase
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Question 71
The accuracy of proportional control is determined by which of the following?
Choose one answer.
a. Steady state error
b. Phase margin
c. Open loop gain
d. Closed loop gain
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Question 72
The thermostat in homes is an example of which of the following?
Choose one answer.
a. Proportional
b. Integral
c. On-Off
d. Derivative
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Question 73
Which of the following about deadbeat overshoot is true?
Choose one answer.
a. Overshoot is within plus and minus 1 percent.
b. Overshoot is within plus and minus 2 percent.
c. Overshoot is within plus and minus 3 percent.
d. Overshoot is within plus and minus 4 percent.
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Question 74
Which of the following about deadbeat response is true?
Choose one answer.
a. Response is fast.
b. There is a short rise time.
c. There is a short settling time.
d. All of the above
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Question 75
Which of the following is a primary objective of lag compensation at low frequencies?
Choose one answer.
a. Maintain gain
b. Increase gain
c. Decrease gain
d. None of the above
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Question 76
Which of the following is a primary objective of lag-lead compensation at low frequencies?
Choose one answer.
a. Increase phase margin
b. Decrease gain
c. Maintain phase margin
d. None of the above
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Question 77
Which of the following occurs in lag-lead compensation?
Choose one answer.
a. Bandwidth increases
b. Bandwidth decreases
c. Bandwidth is constant
d. None of the above
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Question 78
Control systems generally consist of which of the following?
Choose one answer.
a. Input
b. System
c. Output
d. All of the above
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Question 79
In SCILAB, what command can also be used to define first order systems?
Choose one answer.
a. "poly"
b. "csim"
c. "step"
d. "evans"
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Question 80
In SCILAB, what command is used to convert state-space of systems to transfer functions?
Choose one answer.
a. "ss2tf"
b. "tf2ss"
c. "roots"
d. "evans"
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Question 81
In SCILAB, what command is used to create Root Locus of systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "step"
d. "evans"
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Question 82
In SCILAB, what command is used to define second order systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "step"
d. "evans"
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Question 83
In SCILAB, what command is used to define second order overdamped systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "roots"
d. "evans"
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Question 84
In SCILAB, what command is used to define second order underdamped systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "roots"
d. "evans"
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Question 85
In SCILAB, what command is used to define second order undamped systems?
Choose one answer.
a. "roots"
b. "csim"
c. "syslin"
d. "evans"
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Question 86
In SCILAB, what command is used to define second order critically damped systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "roots"
d. "evans"
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Question 87
In SCILAB, what command is used to define state-space of systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "roots"
d. "evans"
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Question 88
In SCILAB, what command is used to find poles of systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "roots"
d. "evans"
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Question 89
In SCILAB, what command is used to find steady state error of systems?
Choose one answer.
a. "ss2tf"
b. "horner"
c. "roots"
d. "evans"
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Question 90
In SCILAB, what command is used to nyquist plot of systems?
Choose one answer.
a. "csim"
b. "step"
c. "bode"
d. "nyquist"
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Question 91
In SCILAB, what command is used to simulate bode plot of systems?
Choose one answer.
a. "csim"
b. "step"
c. "bode"
d. "nyquist"
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Question 92
In SCILAB, what command is used to simulate first order systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "step"
d. "evans"
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Question 93
In SCILAB, what command is used to simulate step response systems?
Choose one answer.
a. "csim"
b. "step"
c. "bode"
d. "nyquist"
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Question 94
In SCILAB, what command is used to define first order systems?
Choose one answer.
a. "syslin"
b. "csim"
c. "step"
d. "evans"
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Question 95
Fill in the blank. Digital control systems have been accelerated by the invention of ______________.
Choose one answer.
a. Vacuum tubes
b. Transformers
c. Microprocessors
d. Opamps
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Question 96
For pole-zero cancellation which of the following candidate controllers is generally used?
Choose one answer.
a. P controller
b. PD controller
c. PI controller
d. PID controller
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Question 97
For strategic zero placement, which of the following candidate controllers is generally used?
Choose one answer.
a. P controller
b. PD controller
c. PI controller
d. PID controller
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Question 98
Which of the following regarding digital control systems is false?
Choose one answer.
a. Digital control system uses digital computers.
b. Digital control system uses digital signals.
c. Measured data is converted from analog to digital.
d. Measured data is converted from digital to analog.
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Question 99
Which of the following regarding manipulation of digital control is true?
Choose one answer.
a. Manipulation is done in digital form.
b. Manipulation is done in analog form.
c. Both A and B
d. None of the above
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Question 100
Which of the following regarding many systems is true?
Choose one answer.
a. Many systems are analog.
b. Many systems are digital.
c. Both A and B
d. None of the above
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Question 101
Which of the following regarding performance of linear digital systems is true?
Choose one answer.
a. Performance of analog is greater than performance of digital.
b. Performance of analog is less than performance of digital.
c. Performance of analog is equal to performance of digital.
d. None of the above
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Question 102
Which of the following regarding performance of nonlinear digital systems is true?
Choose one answer.
a. Performance of analog is greater than performance of digital.
b. Performance of analog is less than performance of digital.
c. Performance of analog is equal to performance of digital.
d. None of the above.
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Question 103
Z-transformation is based on which of the following?
Choose one answer.
a. Laplace
b. State-space
c. Both A and B
d. None of the above
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Question 104
Which of the following regarding robust control systems is false?
Choose one answer.
a. Robust control systems have high sensitivities.
b. Robust control systems have low sensitivities.
c. Robust control is stable over wide range of parameter variations.
d. All of the above
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