# ENT 462 pcq set I

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1. What electrical component allows current to flow in only one direction (approximately)?
diode
2. A diode has approximately two values of ______ depending on _______.
resistance, current direction
3. The dominant resistances of a diode are very large or very small.
true
4. The initial-design goal for the transistor was a component with
variable resistance
5. Another word for "mathematically proportional to"
transformation
6. The original designers of the transistor were trying to make a
variable resistor
7. The transistor was designed by ______ in the ______.
Bell Labs, 1940s
8. Transformative-changing variable resistor was the first name proposed for the _____ by the ______.
transistor, designers
9. Transforming resistor was the second name proposed for the
transistor
10. The name for the transistor was selected from the two words:
transforming and resistor
11. A transistor is most like a
resistor
12. Signal input to the "transforming resistor" is into the
base
13. "power" input to the "transforming resistor" is into the
collector
14. "power" output from the "transforming resistor" is from the
emitter
15. Trans in transistor was derived from
transformative
16. sistor in transistor was derived from
resistor
17. One A/D or D/A with one bit-size can have several sensitivities depending on the voltage or current range, if the range is variable.
true
18. The numerical value and corresponding analog value in a A/D or D/A can be calculated by
interpolation
19. The rise time of the general-purpose OPAMP is about
3000ns
20. The A/D or D/A analog signal is usually _____, but sometimes _____ signal.
voltage, current
21. The rise time of 7400 series digital TTL chips are about
6ns to 33ns
22. Digital signals are ____, and analog signals are _____.
discrete, continuous
23. The output of a digital integrated circuit is said to be discrete, because only the ON state and OFF state are considered useful.
true
24. The settle time of the THS4211 OPAMP is
22ns
25. Analog signals into a computer are converted to digital values through _____ converters
A/D
26. The actual signals inside a computer are
always digital
27. The values of interest in an analog signal are
all values between and including minimum and maximum
28. The values of interest in a digital signal are
on or off
29. The output of an opamp is usually considered
continuous
30. Computers produce analog output signals through _____ converters.
D/A
31. Common A/D and D/A converters are 8, 10, 12, 16 bits. A 10-bit converter utilizes _____ discrete numerical values.
1024
32. The rise time of CMOS (low-power) digital chips are about
500ns
33. The sensitivity of an A/D or D/A is the smallest voltage or current change corresponding to a digital change of one count.
true
34. LabVIEW Front Panel contains
controls and indicators
35. LabVIEW Front Panel contains
virtual instruments
36. LabVIEW Block Diagram contains
the program
37. LabVIEW Block Diagram contains
preprogrammed blocks of computer code
38. Almost every object/icon on the Front Panel has a corresponding object/icon on the Block Diagram
true
39. The controls on the Front Panel include
only the slide
40. The indicators on the Front Panel include
meter, rule weights, and error out
41. The Tools Pallet is for changing the way the mouse pointer works and is valid for
both the Front Panel and Block Diagram.
42. In the first row of the Tools Pallet is rectangular region, that is currently grey, which means that the mouse pointer functionality is
manually selected from the options shown.
43. In the first row of the Tools Pallet is rectangular region, that is currently grey, but will turn green when clicked, which means that the mouse pointer functionality is
automatically selected by the context of what is pointed at.
44. Most icons on the Front Panel were selected from the 100s available, by right clicking anywhere in the
Front Panel
45. Most icons on the Block Diagram were selected from the 100s available, by right clicking anywhere in the
Block Diagram
46. The lower-right quadrant of the Front Panel is not part of the Front Panel. It is presented to demonstrate where to find the
slide and meter
47. The digital display for the slide, currently showing 9.84, is not shown by default. The digital display is included by right clicking the slide and selecting it
true
48. The lower-left quadrant of the Block Diagram is not part of the Block Diagram. It is presented to demonstrate where to find the
Fuzzy Controller, Build Path, and Current VI path
49. The grey line containing the Fuzzy Controller and most icons on the block diagram is a ____ Loop.
While
50. In the lower-right of the While Loop on the Block Diagram is a red-stop function. The VI can be stopped by pressing the
rectangular-stop button on the Front Panel.
51. The rectangular-stop button on the Front Panel can be created by right clicking the red-stop function in the Block Diagram with the wiring tool, and then selecting "control".
true
52. The Arrow Pointer in the Tools Pallet is used for
moving icons around
53. The Finger Pointer in the Tools Pallet is used for
changing values
54. The Wire-Spool Pointer in the Tools Pallet is used for
drawing wires
55. VI stands for
Virtual Instrument
56. One A/D or D/A with one bit-size can have several sensitivities depending on the voltage or current range, if the range is variable.
true
57. The sensitivity of an A/D or D/A is the smallest voltage or current change corresponding to a digital change of one count.
true
58. The A/D or D/A analog signal is usually _____, but sometimes _____ signal.
voltage, current
59. The numerical value and corresponding analog value in a A/D or D/A can be calculated by
interpolation
60. Common A/D and D/A converters are 8, 10, 12, 16 bits. A 10-bit converter utilizes _____ discrete numerical values.
1024
61. Analog signals into a computer are converted to digital values through _____ converters.
A/D
62. Computers produce analog output signals through _____ converters.
D/A
63. The actual signals inside a computer are
always digital
64. The values of interest in an analog signal are
all values between and including minimum and maximum
65. The values of interest in a digital signal are
on or off
66. The settle time of the THS4211 OPAMP is
22ns
67. The rise time of the general-purpose OPAMP is about
3000ns
68. The rise time of CMOS (low-power) digital chips are about
500ns
69. The rise time of 7400 series digital TTL chips are about
6NS TO 33NS
70. The output of a digital integrated circuit is said to be discrete, because only the ON state and OFF state are considered useful.
true
71. The output of an opamp is usually considered
continuous
72. Digital signals are ____, and analog signals are _____.
discrete, continuous
73. The rule of thumb for designing the base resistor for a 2N3904 switch is to use hFE=____.
20
74. One way to design for a power transistor is allow ___ more base current than you actually need, to make sure the device remains saturated.
5x
75. The BJT switch should be designed to work with the ____ hFE.
minimum
76. In both cut-off and saturation, _____ power is dissipated in the transistor.
minimum
77. In saturation, the BJT base current is
maximum
78. In saturation, the BJT collector-emitter voltage (Vce) is
minimum
79. In saturation, the BJT collector current (Ic) is
maximum
80. In saturation, the BJT is fully
on
81. In cut-off, the BJT collector-emitter voltage (Vce) is
high
82. In cut-off, the BJT collector current (Ic) is
zero
83. In cut-off, the BJT base current is
zero
84. In cut-off, the BJT is fully
off
85. For use as a switch, the BJT operates in the regions of the output curves called
saturation and cut-off
86. The transistor output characteristic curves have constant
Ib
87. The transistor output characteristic curves show ___ on vertical axis.
Ic
88. The transistor output characteristic curves show ___ on horizontal axis.
Vce
89. For a transistor there are input, output and transfer characteristic curves. The _____ transfer characteristic curves may be most useful in switch design.
output
90. If the transistor is biased into saturation or cut-off, it will be used as
a switch
91. If the transistor is biased into the linear region, it will be used as
an amplifier
92. A bipolar junction transistor (BJT) can be used in many circuit configurations; as an amplifier, oscillator, filter rectifier or just used as a
switch
 Author: lacythecoolest ID: 327681 Card Set: ENT 462 pcq set I Updated: 2017-03-11 21:50:57 Tags: engineering Folders: Description: set I Show Answers: