# ENT 461 preclass quizsset II

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1. The Feedback Inc 33-033 unit is a ______ system
servomotor
2. The mechanical unit is connected to the control panel
through the ribbon cable
3. The control panel is connected to the computer through
the USB cable
4. The 33-033 system is powered by +15VDC, -15VDC, 5VDC, and ground
true
5. The DC servomotor is about _____ inches in diameter:
two
6. The output shaft is
connected to the motor shaft through pulleys and belts
7. The position sensor on the output shaft is
32:1
8. A digital display shows the ______ shaft speed in ______.
output, rpm
9. The speed sensor on the motor shaft is
tachometer or tacho-generator
10. The position sensor on the motor shaft is
incremental encoder
11. The input voltage range to the power amplifier to the motor is approximately plus and minus
1VDC
12. The "zero offset" potentiometer on the power amplifier to the motor is used to set the initial speed to 0
0
13. The "Input Potentiometer" range is about +-1VDC and is located on the
mechanical unit
14. The "variable dc" input potentiometer range is about +-1VDC and is located on the
control panel
15. Sine, square, and triangle input signals to the servomotor power amplifier are possible through
the control panel.
16. The video demonstrated motor manual-speed control using the
Input potentiometer on the mechanical unit
17. The video demonstrated motor automatic-speed control using the
sine wave input
18. Steady state error is the difference between the steady state output and the input.
true
19. Zeta and wn can be determined directly from the transfer function poles.
true
20. An overdamped system has zeta
greater than one
21. A critically damped system has zeta
equal to one
22. A critically damped or overdamped system's step response will have overshoot.
false
23. An underdamped system's step response will have overshoot.
true
24. An underdamped system has zeta between zero and ____.
1
25. s^2 + 2*zeta*wn*s + wn^2 is a useful form for the denominator of a 2nd-order transfer function. wn (radians/second) is
undamped natural frequency
26. s^2 + 2*zeta*wn*s + wn^2 is a useful form for the denominator of a 2nd-order transfer function. zeta is
damping ratio
27. Which one of these MATLAB functions multiplies two polynomials?
conv()
28. Which one of these MATLAB functions makes a table of step response parameters?
ltiview()
29. Four MATLAB functions were used in the video: tf(), stepinfo(), ltiview(), and conv().
true
30. The response at the first peak minus the steady state value divided by the steady state value and converted to percent is defined as
percent overshoot
31. WebCHARLIE uses the variable PO for percent overshoot. Does the video use the variable %Mp for percent overshoot?
yes
32. The time to the _____ peak is identified as peak time (tp).
first
33. The text uses +-2% for settle time, but the video used +-___%.
1
34. Settle time of a step response is the time to go from zero to 99% of the steady state value.
false, because 99% and 101% must be included
35. Rise time of a step response is the time to go from ___% to ___% of the total response.
10, 90
36. The video does not mention the closed loop controller that positions the head, but the last homework exercise does.
true
37. Ref video: signal processing permits even greater data-storage capacity.
true
38. Ref video: smaller platter-head separation results in _____ data-storage capacity.
greater
39. Ref video: the platter-head separation is about _____nm and the wavelength of light is between 400 and 700 nm.
10
40. Ref video: the speed of the platter relative to the floating head is ____ mph.
80
41. Ref video: no electrical pulse in the head corresponds to
0
42. Ref video: a negative electrical pulse in the head corresponds to a
1
43. Ref video: a positive electrical pulse in the head corresponds to a
1
44. Ref video: the linear motor moves due to the ______ force.
Lorentz
45. 14. Ref video: a spinning disk that contains the magnetized bits is the
platter
46. Ref video: ones and zeros are written (or read) by the
47. Ref video: physical motion of the head is caused by a(n)
voice-coil actuator
48. This course considers systems with one input and one output. Therefore R=0 so that the system response (C) to disturbance (D) can be evaluated.
true
49. In H461220, Figure 220 has ___ input signal(s).
2
50. In H461220, the sensor in Fig. 220 is
H
51. In H461220, the sensor in Fig. 220 is
1/(s+1)
52. In H461220, the controller in Fig. 220 is
K
53. In H461220, the error signal in Fig. 220 is
E(s)
54. In H461220, the output signal in Fig. 220 is
C(s)
55. H461220, the input signal in Fig. 220 is
R(s)
56. In H461220, the disturbance signal in Fig. 220 is
D(s)
57. In H461220, distubance in a closed loop feedback system is
undesirable and not avoidable usually
58. In H461220, the focus of this video is on disturbance
rejection
59. The partial derivative of z(x,y) with respect to y, means that ___ is held constant.
x
60. The partial derivative of z(x,y) with respect to x, means that ___ is held constant.
y
61. z(x,y) = f(x,y). A common notion of partial derivative of f with respect to y is
fy
62. z(x,y) = f(x,y). A common notion of partial derivative of f with respect to x is
fx
63. The number of lines that define a plane is
two
64. The number of tangent lines to any point on a surface is
infinite
65. The number of tangent planes to any point on a surface is
one
66. Partial derivative of z(x,y) with respect to y is the same a regular derivative except ___ is considered constant.
x
67. Partial derivative of z(x,y) with respect to x is the same a regular derivative except ___ is considered constant.
y
68. Partial derivatives are meaningful in 3D surfaces.
true
69. The derivative of z(x,y) at constant x is the ____ derivative of z with respect to ____.
partial, y
70. The derivative of z(x,y) at constant y is the ____ derivative of z with respect to ____.
partial, x
71. When one takes a derivative of a 3D surface, the direction of the derivative
must also be specified
72. The number of slopes for any point on a 3D surface is
infinite
73. A function that produces a 3D surface is z(x,y), which means that z is a function of
x and y
74. In a right-hand coordinate system,
ixj=k
75. Ground loops can be caused by grounding
both ends of a cable
76. Ground loops are
undesirable and avoidable
77. A primary purpose of the instrumentation amplifier is
amplifies a small signal while rejecting a common-mode DC component
78. An instrumentation amplifier has
plifies a small signal while rejecting a common-mode DC component
79. An instrumentation amplifier has
differential input and a single-ended output with respect to ground
80. See Fig 4.1. The ground point on the op-amp is not shown,
because there is no ground point on an op-amp
81. The op-amp is ubiquitous device, meaning that
it is commonly used
82. most applications with feedback, voltage gain, input impedance, and output impedance depend on
external components
83. See Fig 4.1. The op-amp is
rarely used without feedback
84. The ability of an op-amp to eliminate unwanted coupling between adjacent op-amps
channel separation
85. See Fig 4.1. The no-load supply current (I_s) is
typically a few mA
86. See Fig 4.1. The op-amp output (for which current can go in or out)
can be shorted indefinitely
87. See Fig 4.1. The short-circuit current (Isc) is typically
10ma to 30mA
88. See Fig 4.1. Zout is
typically small
89. See Fig 4.1. The input impedance (Zin+ and Zin-) are
typically 100s of Mohms
90. See Fig 4.1 Vs is
supply voltage
91. See Fig 4.1. The op-amp output current (I.out) originates from
+Vs and -Vs
92. See Fig 4.1. Vout = ( (Vin+) - (Vin-) ) * A where A is the op-amp gain and is
typically hundreds of thousands, but never known precisely
93. See Fig 4.1
• Vs is usually about 15v
•  -Vs < Vout < +Vs
•  I.in+ = I.in- is approximately zero
94. See Fig 4.1. When connected to other components and when
n+ = Vin-, the op-amp is operating in the linear range
95. Many op-amps today cost less than \$1
and are a major building block in industrial circuits
96. The first solid-state op-amp was designed by Bob Widlar at Fairchild Semiconductor and sold in 1963 for about
\$300
97. The op-amp has
• low output impedance
• high input impedance
• high gain
98. All of these are active (not passive) because of the plus and minus supply voltages
true
99. A passive system does not require supply voltages.
true
100. All of the opamp filters are on Figure 9033-____.
B
101. The basic opamp without any feedback is subfig A-11
true
102. The voltage follower is subfig ___
A-32
103. The non-inverting amplifier is subfig ___
A-22
104. The inverting amplifier is subfig ___
A-21
105. The integrator is subfig ___
A-24
106. The differentiator is subfig ___
A-34
107. The summing amplifier is subfig ___
A-13
108. The differential amplifier is subfig ___
A-23
109. The current-to-voltage converter is subfig ___
A-14
110. The voltage-to-current converter is subfig ___
A-33
111. RB in subfig A-31 is calculated as the parallel combination of R1 and RF for the purpose of reducing the output offset voltage
true
112. The first-order low-pass filter is subfig ___
B-11
113. The unity-gain second-order low-pass filter is subfig ___
B-12
114. The non-unity-gain second-order low-pass filter is subfig ___
B-31
115. fourth-order low-pass filter is subfig ___
B-21
116. The first-order high-pass filter is subfig ___
B-32
117. e second-order high-pass filter is subfig ___
B-13
118. e band-pass filter is subfig ___
B-33
119. The band-stop filter is subfig ___
B-22
120. The monolithic (2 or 3 matched opamps in a single package) usually provide specifications that more-closely match actual preformance in subfig ___
BOTH OF THESE
 Author: lacythecoolest ID: 324764 Card Set: ENT 461 preclass quizsset II Updated: 2016-10-20 08:33:57 Tags: engineering Folders: Description: 1st semester 2nd set Show Answers: