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1
Q

A) The capacitive reactance increases by a factor of four.
B) The capacitive reactance increases by a factor of eight.
C) The capacitive reactance is unchanged.
D) The capacitive reactance decreases by a factor of eight.
E) The capacitive reactance decreases by a factor of four.

A

E) The capacitive reactance decreases by a factor of four.

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2
Q

Which of the following units results when calculating the quantity …

A

Ohm

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3
Q

current independent of frequency
A) resistors only
B) inductors only
C) capacitors only
D) a combination of inductors and resistors
E) a combination of inductors and capacitors

A

A) resistors only

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4
Q

A battery is used to drive a circuit
Which combination of elements is most likely to comprise the circuit?
A) resistors only
B) inductors only
C) capacitors only
D) a combination of inductors and resistors
E) a combination of inductors and capacitors

A

C) capacitors only

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5
Q 
A)  39 
B)  110 
C)  330 
D)  660 
E)  1.0 ◊ 103 
A

D) 660 Ohms

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6
Q

Which one of the following graphs illustrates how capacitive reactance varies with frequency?

A

D) Exponential down

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7
Q

TABLE: What effect does –decreasing the capacitance– have on the reactance and current in this circuit?

A

E) Increases Decreases

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8
Q 
A)  41 µF
B)  260 µF
C)  51 mF
D)  0.10 F
E)  0.31 F
A

A) 41 µF

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9
Q 
A)  49.0 
B)  72.5 
C)  97.6 
D)  145 
E)  308 
A

A) 49.0 Ohms

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10
Q 
A)  60.0 Hz
B)  72.4 Hz
C)  85.7 Hz
D)  98.9 Hz
E)  131 Hz
A

E) 131 Hz

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11
Q 
A)  0.917 A
B)  0.802 A
C)  0.308 A
D)  0.621 A
E)  0.125 A
A

E) 0.125 A

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12
Q 
*5 PART QUESTION: 
Graph: Sinusoidal, big and little waves, 99V, 2.8A
A)  0.14 Hz
B)  7.14 Hz
C)  12.5 Hz
D)  25.0 Hz
E)  50.0 Hz
A)  49.5 V
B)  70.0 V
C)  112 V
D)  140 V
E)  170 V
A)  1.4 A
B)  2.0 A
C)  3.4 A
D)  3.9 A
E)  5.6 A
A)  20 
B)  25 
C)  30 
D)  35 
E)  40 
A)  The element is a 25- resistor.
B)  The element is a 35- resistor.
C)  The element is a 0.45-H inductor.
D)  The element is a 360-µF capacitor.
E)  The element is a 510-µF capacitor.
A

C) 12.5 Hz

B) 70.0 V

B) 2.0 A

D) 35 Ohms

D) The element is a 360-µF capacitor.

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13
Q 
When the frequency of an ac circuit is decreased, the current in the circuit increases.  Which combination?
A)  resistors only
B)  inductors only
C)  capacitors only
D)  capacitors and resistors
E)  inductors and capacitors
A

B) inductors only

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14
Q 
Which circuit elements act to oppose changes in the current in an ac circuit?
A)  resistors only
B)  capacitors only
C)  inductors only
D)  both resistors and inductors
E)  both capacitors and resistors
A

C) inductors only

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15
Q

Which one of the following graphs shows how the inductive reactance varies with frequency?

A

Answer: Positive Linear Relationship

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16
Q

TABLE: What effect does increasing the inductance ?

A

Increases Decreases

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17
Q

when the frequency is increased to 2f?
A) The inductive reactance increases by a factor of two.
B) The inductive reactance increases by a factor of four.
C) The inductive reactance is unchanged.
D) The inductive reactance decreases by a factor of four.
E) The inductive reactance decreases by a factor of two.

A

A) The inductive reactance increases by a factor of two.

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18
Q 
A)  230 
B)  320 
C)  158 
D)  56 
E)  27 
A

B) 320 Ohms

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19
Q 
A)  0.62 A
B)  2.0 A
C)  3.2 A
D)  1.0 A
E)  14 A
A

D) 1.0 A

When 14A is an option, the answer is 1A

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20
Q

DIAGRAM ANSWERS:

which phasor model inductor and ac generator?

A

Diagram with Io pointing below x-axis

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21
Q

4 PART QUESTION:
Sinosoidal Graph, big and little waves 80V, 2A
A) The element is a resistor.
B) The element is a capacitor.
C) The element is an inductor.
D) The element could be a resistor or an inductor.
E) The element could be an inductor or a capacitor.

A)  0.01 Hz
B)  0.04 Hz
C)  0.09 Hz
D)  11 Hz
E)  25 Hz
A)  1.0 A
B)  1.4 A
C)  2.0 A
D)  2.8 A
E)  4.0 A
A)  20 
B)  25 
C)  40 
D)  57 
E)  80 
A

C) The element is an inductor.

E) 25 Hz

B) 1.4 A

C) 40 Ohms

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22
Q

A) The current and voltage are in phase for a capacitor in an ac circuit.
B) On average, the power dissipated by a resistor in an ac circuit is zero.
C) For a resistor in an ac circuit, the current and voltage are 90∞ out of phase.
D) Inductors in an ac circuit offer little opposition to current at high frequencies.
E) When only resistance is present in an ac circuit, voltage and current are in phase.

A

E) When only resistance is present in an ac circuit, voltage and current are in phase.

23
Q 
Note the following circuit elements:  (1) resistors,  (2) capacitors, and (3) inductors.  Which of these elements uses no energy, on average, in an ac circuit?
A)  1 only
B)  2 only
C)  3 only
D)  both 2 and 3
E)  both 1 and 3
A

D) both 2 and 3

24
Q

A) The impedance is dominated by the capacitance at low frequencies.
B) The impedance is dominated by the resistance at high frequencies.
C) The impedance depends only on the values of C and L.
D) The impedance depends only on the resistance.
E) The impedance is independent of frequency.

A

A) The impedance is dominated by the capacitance at low frequencies.

25
Q

When the frequency of an ac circuit is increased at constant voltage, the current increases and then decreases. Which combination
A) resistors only
B) inductors only
C) capacitors only
D) a combination of inductors and resistors
E) a combination of inductors and capacitors

A

E) a combination of inductors and capacitors

26
Q
  1. For which one of the following circuit arrangements will the power factor be non-zero?
    A) a capacitor in series with an ac generator
    B) an inductor in series with an ac generator
    C) two capacitors in series with an ac generator
    D) a capacitor and resistor in series with an ac generator
    E) a capacitor and inductor in series with an ac generator
A

D) a capacitor and resistor in series with an ac generator

27
Q

CHART: In which circuit will the voltage lead the current?

A

D)
150 
79 
212 

28
Q

GRAPH: at what frequency is the largest contribution?

A

A) f1

29
Q
  1. Complete the following statement: When the current in an oscillating LC circuit is zero,
    A) the charge on the capacitor is zero.
    B) the energy in the electric field is maximum.
    C) the energy in the magnetic field is a maximum.
    D) the charge is moving through the inductor.
    E) the energy is equally shared between the electric and magnetic fields.
A

B) the energy in the electric field is maximum.

30
Q 
Phase Angle: 
A)  0∞
B)  90∞
C)  180∞
D)  270∞
E)  360∞
A

C) 180∞

31
Q

Which circuit will have a negative phase angle?

A

E)
148 
219 
180 

32
Q 
RCL circuit, power of +1.00. Inductance?
A)  0.86 H
B)  1.4 H
C)  2.3 H
D)  57 H
E)  320 H
A

B) 1.4 H

33
Q 
DIAGRAM: 60Hz, .035 H, 150 Ohms
A)  300 
B)  500 
C)  1500 
D)  1700 
E)  1900 
Phase Angle: 
A)  zero degrees
B)  +5.3∞
C)  ñ9.6∞
D)  ñ84∞
E)  +90∞
A

C) 1500 Ohms

D) ñ84∞

34
Q 
A)  190 W
B)  28.9 W
C)  19.7 W
D)  4.18 W
E)  zero watts
A

B) 28.9 W

35
Q 
*7 PART QUESTION: 
150V at 60Hz, 35 mH inductor, 85 Ohm resistor: 
A)  220 V
B)  110 V
C)  82 V
D)  75 V
E)  53 V
A)  59 
B)  85 
C)  99 
D)  120 
E)  310 
A)  13 
B)  23 
C)  59 
D)  85 
E)  99 
Impedance
A)  13 
B)  23 
C)  59 
D)  85 
E)  97 
A)  0.28 A
B)  0.40 A
C)  0.75 A
D)  1.1 A
E)  1.6 A
A)  0.47
B)  0.54
C)  0.64
D)  0.88
E)  28.3

A) The voltage leads the current.
B) The circuit is more capacitive than inductive.
C) The voltage and current are exactly out of phase.
D) The voltage and current are in phase.
E) The phase angle for this circuit is positive.

A 
B)  110 V
A)  59 Ohms (lowest option!)
A)  13 Ohms (lowest option!)
E)  97 Ohms (Impedance)
D)  1.1 A
D)  0.88
B)  The circuit is more capacitive than inductive.
36
Q 
*5 PART QUESTION, TABLE to determine answers:
A)  0.25 A
B)  0.43 A
C)  0.50 A
D)  0.86 A
E)  1.08 A
A)  11 
B)  22 
C)  349 
D)  486 
E)  1240 
A)  150 V
B)  212 V
C)  300 V
D)  414 V
E)  533 V
A)  0.40
B)  0.57
C)  0.81
D)  1.4
E)  5.5
A)  37.0 W
B)  64.5 W
C)  73.3 W
D)  95.4 W
E)  129 W
A 
B)  0.43 A
C)  349 Ohms
B)  212 V
B)  0.57
A)  37.0 W
37
Q 
***10 PART QUESTION (broken up in 2) Pt.1
300 Ohm Resistor 
A)  180 V
B)  255 V
C)  300 V
D)  360 V
E)  480 V
A)  150 
B)  190 
C)  360 
D)  390 
E)  440 
A)  150 
B)  190 
C)  360 
D)  390 
E)  440 
A)  150 
B)  190 
C)  360 
D)  390 
E)  440 
A)  0.46 A
B)  0.52 A
C)  0.65 A
D)  0.78 A
E)  0.85 A
A 
B)  255 V
E)  440 Ohms CR
B)  190 Ohms IR
D)  390 Ohms I
C)  0.65 A
38
Q 
***10 PART QUESTION (broken up in 2) Pt.2
300 Ohm Resistor 
A)  26∞
B)  ñ32∞
C)  38∞
D)  ñ40∞
E)  50∞
A)  48 W
B)  54 W
C)  63 W
D)  83 W
E)  112 W
A)  120 V
B)  180 V
C)  190 V
D)  260 V
E)  290 V
A)  120 V
B)  140 V
C)  190 V
D)  260 V
E)  290 V
A)  120 V
B)  180 V
C)  190 V
D)  210 V
E)  290 V
A 
D)  ñ40∞
C)  63 W
A)  120 V I
C)  190 V R
E)  290 V C
39
Q 
A)  22 W
B)  81 W
C)  166 W
D)  193 W
E)  102 W
A

D) 193 W

40
Q 
A)  52 mH
B)  74 mH
C)  0.12 H
D)  2.1 H
E)  13 H
A

A) 52 mH

41
Q

GRAPH: shows impedance as a function of frequency

At what point will circuit resonate?

A

B) f2

42
Q 
A)  11.9 Hz
B)  69.4 Hz
C)  1.06 ◊ 102 Hz
D)  8.27 ◊ 102 Hz
E)  1.30 ◊ 103 Hz
A

E) 1.30 ◊ 103 Hz

43
Q 
CA/CB.
A)  0.44
B)  0.27
C)  3.7
D)  1.8
E)  2.4
A

B) 0.27

44
Q 
A)  2.4 ◊ 10ñ11 F
B)  3.6 ◊ 10ñ11 F
C)  4.4 ◊ 10ñ11 F
D)  6.8 ◊ 10ñ11 F
E)  8.8 ◊ 10ñ11 F
A

E) 8.8 ◊ 10ñ11 F

45
Q 
A)  0.02 A
B)  0.03 A
C)  0.05 A
D)  0.09 A
E)  0.12 A
A

C) 0.05 A

46
Q

A) When the current in the inductor is zero, I/t = 0 A/s.
B) The circuit will allow dc as well as ac current to flow.
C) The magnetic field in the inductor is a maximum at t = 0 s.
D) The charge on the capacitor will be a maximum at t = 4.2 ◊ 10ñ7 s.
E) As the current through the inductor decreases, the induced emf in the coil is directed opposite to the direction of the current.

A

C) The magnetic field in the inductor is a maximum at t = 0 s.

47
Q

A) Doping makes the charge carriers mobile.
B) Doping makes the charge carriers immobile.
C) Doping makes the semiconducting material non-conducting.
D) Doping increases the conductive properties of the semiconductors.
E) Doping converts the semiconducting material into a metallic material like copper.

A

D) Doping increases the conductive properties of the semiconductors.

48
Q

A) the bias voltages are reversed.
B) they are made from different materials.
C) one is a bipolar transistor and the other is not.
D) one conducts electricity and the other does not.
E) the current directions are the same while the voltages are reversed.

A

A) the bias voltages are reversed.

49
Q 
A)  silicon doped with boron
B)  silicon doped with gallium
C)  germanium doped with boron
D)  silicon doped with phosphorus
E)  germanium doped with gallium
A

D) silicon doped with phosphorus

50
Q

A) A diode is fabricated by forming junctions between one n-type and two p-type semiconductors or one p-type and two n-type semiconductors.
B) At an n-p junction in a diode that is not connected to a battery, an electric field exists across the junction.
C) A battery can be connected to a diode so that a continual flow of charge results.
D) A diode connected to an ac source allows current to flow only in one direction.
E) Holes move in a diode under a forward-bias condition.

A

A) A diode is fabricated by forming junctions between one n-type and two p-type semiconductors or one p-type and two n-type semiconductors.

51
Q 
A)  2.87
B)  2.32
C)  0.430
D)  0.348
E)  0.253
A

D) 0.348

52
Q 
A)  V = 0.6 sin[(1.1 ◊ 106 rad/s)t]
B)  V = 0.6 sin[(1.2 ◊ 103 rad/s)t]
C)  V = 1.2 sin[(5.3 ◊ 106 rad/s)t]
D)  V = 1.2 sin[(2.3 ◊ 105 rad/s)t]
E)  V = 2.8 sin[(4.6 ◊ 106 rad/s)t]
A

B) V = 0.6 sin[(1.2 ◊ 103 rad/s)t]

53
Q 
A)  R1 = R2 = R3
B)  R1 = 2R2
C)  R1 = R2
D)  R1 = R3
E)  R2 = R3
A

D) R1 = R3

54
Q 
6 PART QUESTION: 
A)  84.9 V
B)  138 V
C)  151 V 
D)  169 V
E)  240 V
A)  60 
B)  188 
C)  377 
D)  514 
E)  754 
A)  50 
B)  190 
C)  195 
D)  240 
E)  210 
A)  2.40 A
B)  1.71 A
C)  1.33 A 
D)  0.617 A
E)  0.437 A
A)  2.40 A
B)  1.71 A
C)  1.33 A 
D)  0.617 A
E)  0.437 A
A)  9.50 W
B)  21.2 W
C)  74.9 W 
D)  113 W
E)  138 W
A 
A)  84.9 V
B)  188 Ohms
C)  195 Ohms
E)  0.437 A
D)  0.617 A (Peak Current)
A)  9.50 W

Sociology (7 decks)

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