ENT 342 Exam 1

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  1. The stable exponential function changes _____% every time constant.
    63.2
  2. The stable exponential function leaves _____% remaining every time constant.
    36.8
  3. The stable exponential function reaches the practical-final value in 4 or 5 time constants
    true
  4. Only _____% remains after 4 times constants in the stable exponential function
    1.8
  5. Only _____% remains after 5 times constants in the stable exponential function.
    0.67
  6. A stable exponential function has the form y=exp(a*t) where "a" is
    -1/tau
  7. A stable exponential function has the form y=1-exp(a*t) where "a" is
    -1/tau
  8. A stable exponential function, y=exp(a*t), is a(n) _____ function.
    decreasing
  9. A stable exponential function, y=1-exp(a*t), is a(n) _____ function.
    increasing
  10. In this course, it is assumed that the stable exponential function reaches steady state after ___ time constants.
    4
  11. If "a" is positive, the exponential function, y=exp(a*t), is
    unstable
  12. What number "A" yields the DEQ: A^t = (d/dt)(A^t)
    e
  13. Why does e=2.71828...? This is a special number that "pops" out of nature because
    • both of these
    • the expontial function is its own derivative
    • e^t = (d/dt)(e^t)
  14. The capacitor _______ is always continuous.
    voltage
  15. The inductor _______ is always continuous.
    current
  16. In Fig 260 (HW Ex260), each capacitor acts like a ______ at t=0+, due to the IV relationship for a capacitor.
    short(wire)
  17. In Fig 260 (HW Ex260), inductor acts like a ______ at t=0+, due the IV relationship for an inductor.
    open
  18. For the resistors in Fig 260 (HW Ex260), _______ continuous.
    for each resistor, neither voltage nor current need be
  19. The notation t=0- means ______ and t=0+ ,means _____
    just prior to t=0, just after t=0
  20. In Fig 260 (HW Ex270), both capacitors act like a(n) ______ in the steady state, due the IV relationship for a capacitor.
    open
  21. In fig 260 (HW Ex270), the inductor acts like a(n) ______ in the steady state, due the IV relationship for the inductor.
    short(wire)
  22. Resistors in transient circuits act like ______, due the IV relationship for resistors.
    resistors, which can have discontinuous voltage or current
  23. A square wave of voltage across a resistor would result in a _____ current function.
    square wave
  24. A square wave of current through a resistor would result in a _____ voltage function.
    square wave
  25. A square wave of current through an inductor would result in a _____ voltage function.
    infinite pikes (delta functions), alternating between positive and negative
  26. A square wave of voltage across a capacitor would result in a _____ current function
    infinite pikes (delta functions), alternating between positive and negative
  27. A triangle wave of current through an inductor would result in a _____ voltage function.
    square wave
  28. A triangle wave of voltage across a capacitor would result in a _____ current function.
    square wave
  29. If the current through an inductor could be positive unit step (u(t)), the voltage would be
    positive infinite spike (delta function)
  30. If the voltage across a capacitor could be positive unit step (u(t)), the current would be
    positive infinite spike (delta function)
  31. If iL(t)= cos(t), then vL(t) is
    -L*sin(t)
  32. If iL(t)= sin(t), then vL(t) is
    L*cos(t)
  33. If iL(t)=M*t+B, then vL(t) is
    L*M
  34. If the inductor current is constant (i.e. iL(t)=A), then the voltage (vL(t)) is
    zero
  35. If vc(t)= cos(t), then ic(t) is
    -C*sin(t)
  36. If vc(t)= sin(t), then ic(t) is
    C*cos(t)
  37. If vc(t)= M*t + B, then ic(t) is
    C*M
  38. If the capacitor voltage is constant (i.e. vc(t)=A), then the current (ic(t)) is
    zero
  39. The current-voltage relationship for a capacitor is
    a differential equation
  40. The current-voltage relationship for a resistor is
    Ohm's Law
  41. Using the notation: y vs x or i(t) vs v(t), the slope of the linear-resistor relationship is
    1/R
  42. Using the notation: y vs x or v(t) vs i(t), the slope of the linear-resistor relationship is
    R
  43. The load resistor that dissipates the maximum power is the
    same as the Thevenin or Norton source resistance
  44. Replace current sources in the superposition method with ______.
    opens
  45. Replace voltage sources in the superposition method with ______.
    shorts
  46. The only method that can handle mixed sources is the ______ method.
    Superposition
  47. One can ignore the relative sizes of the loop currents (eg The relative sizes of I1, I2, I3 do not matter, but the direction does matter).
    true
  48. One ______ the relative sizes of the node voltages (eg ______ ).
    must assume, for example: V1>V2>V3 or V3>V2>V1 or V1>V3>V2
  49. Actual current in the loop current method is the assumed current if
    that branch is isolated
  50. Loop current or node voltage method can be used for a circuit containing mixed sources if
    Thevenin/Norton method is first used to make all the sources the same.
  51. Each voltage in the node voltage method is the ______ voltage.
    assumed
  52. Each current in the loop current method is the ______ current.
    KCL
  53. The loop current method develops one ____ equation per loop.
    KVL
  54. The node voltage method requires all _____ sources.
    current
  55. The loop current method requires all ______ sources.
    voltage
  56. L=[1,1;2,2] M=[3;3]. N=L*M. N(1,1)= 
    6
  57. When conventional current leaves the positive terminal of a battery, the battery is
    delivering power
  58. Advanced circuit analysis methods using multiple sourses include: Superposition, Loop Current, Node Voltage, Thevenin/Norton and
    no more. Only those four
  59. The video entitled "EE Toolbox" claims that those tools are sufficient for any circuit containing one only one source.
    inclusion of Wye-Delta and Delta-Wye formulas would make this true.
  60. The current divider rule applies to
    two parallel resisitors
  61. The voltage divider rule applies to
    two series resistors
  62. Voltage sources can be connected in series
    yes, this is true
  63. Voltage sources can be connected in parallel if
    they are identical
  64. Resistor conventional current direction is
    always in the positive terminal
  65. Conventional current direction through a battery
    depends on the rest of the circuit
  66. Conventional current direction through a resistor
    is always from high to low voltage
  67. Parallel resistors have the
    identical voltage
  68. Series resistors have the
    identical current
  69. Power is
    • V*V/R
    • I*I*R
    • I*V
  70. A current source has a
    constant current
  71. Parallel current sources combine like
    addition or subtraction, depending on current direction
  72. Series batteries combine like
    series resistors, except polarity is considered
  73. KCL is
    Currents balance for any node (i.e. current in = current out)
  74. KVL is
    Voltages (delta-Vs) around any loop balance
  75. The law of Ohm is
    I=V/R
  76. The number of radians in 180 degrees is
    pi
  77. The number of degrees in one radian is approximately
    57
  78. The angle measured in radians is
    the arc length divided by the radius
  79. An angle of one radian occurs when the _____ and the arc length are ____.
    radius, the same
  80. What is an infinite-Ohm resistor?
    open circuit
  81. An infinite-Ohm resistor connected to the open terminals of the original circuit or to the Thevenin or the Norton circuit will all have ______ voltage and will also have the
    the same, the same
  82. A zero-Ohm resistor connected to the open terminals of the original circuit or to the Thevenin or the Norton circuit will all have ______ voltage and will also have the
    the same, the same
  83. A Thevenin/Norton conversion will simplify a multiple source circuit, into a circuit containing ___ source(s).
    1
  84. When the same external-load resistor is connected to equivalent Thevenin and Norton circuits, the load-resistor voltages will be ____ and the currents will be ___.
    the same, the same
  85. After finding R_Norton and I_Norton, Vth can be calculated with Vth =
    R_Norton * I_Norton
  86. After finding Rth and Vth, I_Norton can be calculated with I_Norton =
    Vth/Rth
  87. Any component connected to a circuit will have the same voltage and current when connected to the equivalent Norton circuit.
    true
  88. Any component connected to a circuit will have the same voltage and current when connected to the equivalent Thevenin circuit.
    true
  89. A Norton source is a ___________ source
    current
  90. A Thevenin source is a ___________ source
    voltage
  91. When finding the Thevenin or Norton resistance between two open terminal, replace all CURRENT sources with
    opens
  92. When finding the Thevenin or Norton resistance between two open terminal, replace all VOLTAGE sources with
    shorts
  93. The relationship between the Thevenin resistance and Norton resistance is
    they are equal
  94. When a wire is connected between the two open Norton terminals, that current is called
    short-circuit current
  95. When a wire is connected between the two open Thevenin terminals, that current is called
    short-circuit current
  96. The current through the shorted (previously open) terminals of the Thevenin or Norton circuit is called
    short-circuit current
  97. The voltage between the open terminals of the Thevenin or Norton circuit is called
    open-circuit voltage
  98. Both Thevenin and Norton circuits have
    two terminals open
  99. Norton circuits have
    parallel current source and resistor
  100. Thevenin circuits have
    series voltage source and resistor

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Author:
lacythecoolest
ID:
316204
Filename:
ENT 342 Exam 1
Updated:
2016-02-21 04:40:39
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1st set of exam cards
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