ME401-FinalExam-Answers

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.

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

Question 3

Fill in the blank. Laplace transformations use the __________ variable?

Choose one answer.

	a. “t”
	b. “s”
	c. “d”
	d. “g”

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

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

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

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

Question 8

How many poles will a second order system have?

Choose one answer.

	a. One
	b. Two
	c. Three
	d. Four

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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.

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Question 41

Root Locus of a first order system has how many branches?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

Question 42

Root Locus of a second order system has how many branches?

Choose one answer.

	a. 0
	b. 1
	c. 2
	d. 3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Question 59

Fill in the blank. Lead compensation is equivalent to ________ control?

Choose one answer.

	a. P
	b. D
	c. PD
	d. PID

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

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

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

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

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

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

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

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

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

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

Question 70

Pre-filters are generally used to cancel which of the following?

Choose one answer.

	a. Zeros
	b. Poles
	c. Gain
	d. Phase

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

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

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.

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

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

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

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

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

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”

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”

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”

Question 82

In SCILAB, what command is used to define second order systems?

Choose one answer.

	a. “syslin”
	b. “csim”
	c. “step”
	d. “evans”

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”

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”

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”

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”

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”

Question 88

In SCILAB, what command is used to find poles of systems?

Choose one answer.

	a. “syslin”
	b. “csim”
	c. “roots”
	d. “evans”

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”

Question 90

In SCILAB, what command is used to nyquist plot of systems?

Choose one answer.

	a. “csim”
	b. “step”
	c. “bode”
	d. “nyquist”

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”

Question 92

In SCILAB, what command is used to simulate first order systems?

Choose one answer.

	a. “syslin”
	b. “csim”
	c. “step”
	d. “evans”

Question 93

In SCILAB, what command is used to simulate step response systems?

Choose one answer.

	a. “csim”
	b. “step”
	c. “bode”
	d. “nyquist”

Question 94

In SCILAB, what command is used to define first order systems?

Choose one answer.

	a. “syslin”
	b. “csim”
	c. “step”
	d. “evans”

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

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

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

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.

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

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

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

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.

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

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