1. ____ is an example of a circuit-switched network.
Answer
Correct Answer:
A telephone system
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2. Which of these is the equivalent of a farad, the unit of capacitance?
Answer
Correct Answer:
second/ohm
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3. In a low-noise block downconverter (LNB), at what frequency is the amplification typically executed?
Answer
Correct Answer:
at the sky frequency
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4. A differential amplifier made to produce two outputs of equal amplitude but opposite polarity is called
Answer
Correct Answer:
phase splitter
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5. Digital latches may be constructed by cross-coupling (the output of one gate serves as one of the other gate's inputs) two of the same gates. What configuration is equivalent to an SR NOR latch for which the two inputs act as Set and Reset?
Answer
Correct Answer:
a NOT-S, NOT-R NAND latch
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6. In the coil stage prior to rectification, an automobile alternator typically generates which type of electricity?
Answer
Correct Answer:
three-phase alternating current
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7. What is the term for the amount by which a signal exceeds the minimum amount for a circuit's proper operation?
Answer
Correct Answer:
noise margin
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8. A transformer in which the windings are surrounded by the core is called
Answer
Correct Answer:
shell form
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9. Dithering of a digital signal is a common method for combating what underisable phenomenon?
Answer
Correct Answer:
edge ringing
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10. Which of the following statements can be made concerning A XNOR (B XNOR C) = (A XNOR B) XNOR C ?
Answer
Correct Answer:
this is true because XNOR is associative
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11. A high-voltage primary circuit is isolated with the use of a relay switch on a secondary circuit. Does the addition of the relay circuit add inductance to either circuit?
Answer
Correct Answer:
yes, to the secondary circuit
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12. In a system with a transmission multiplexer and a reception demultiplexer, how many outputs is it typical for the multiplxer to possess?
Answer
Correct Answer:
1
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13. What is Wein Bridge used for?
Answer
Correct Answer:
measurement of capacitance
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14. Dithering of an audiofrequency signal typically occurs at what stage?
Answer
Correct Answer:
following digital-to-analog conversion and prior to playback
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15. A "bias tee" consists of a single output that is capacitively coupled to a radiofrequency signal and inductively coupled to a DC signal. What is the primary purpose of this device?
Answer
Correct Answer:
to add a DC offset to an RF signal
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16. True or False: The lumped element model is used whenever the circuit's length is greater than the circuit's operating wavelength.
Answer
Correct Answer:
False
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17. True or False? The neutral lead of a polarized alternating-current plug is suitable for use as a chassis ground.
Answer
Correct Answer:
False
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18. True or False? Race conditions can only occur in digital circuits.
Answer
Correct Answer:
False
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19. For inputs A = 1 and B = 1, which of these logic operations between A and B will yield output 1?
Answer
Correct Answer:
XNOR
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20. When we connect germanium diode with silicon diode in parallel, the over all voltage drop is :
Answer
Correct Answer:
0.3 volt
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21. To which of the inputs will the feedback be routed for an operational amplifier (op-amp) employed as a non-inverting amplifier?
Answer
Correct Answer:
the inverting input
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22. True or False? Any phase delay between two analog signals is lost after both signals have been three-level Nyquist sampled.
Answer
Correct Answer:
False
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23. How can a led and a basic diode be connected to an ac source for correct operation?
Answer
Correct Answer:
Parallel connection of the diodes in series with the ac source.
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24. In a high-pass filter consisting of a resistor and an inductor, how will the cut-off frequency change if the inductance is increased?
Answer
Correct Answer:
The cut-off frequency is lower for larger inductances.
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25. What is the chacteristic feature of heterodyne processing compared with homodyne processing?
Answer
Correct Answer:
only heterodyne processing employs frequency conversion
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26. For which values of inputs A and B would a NAND gate and an XOR gate NOT have the same output?
Answer
Correct Answer:
A=0, B=0
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27. Which of the following combinations of gates could be used to realize the XOR function?
Answer
Correct Answer:
one AND, one NAND, and one OR
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28. Two cross-coupled (the output of one gate serves as one of the other gate's inputs) NOR gates constitutes what type of digital circuit?
Answer
Correct Answer:
an SR latch
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29. Consider a typical household AC circuit that is protected by both a circuit breaker and a ground-fault interruptor. A person accidentally shorts the hot lead to ground, drawing a lethal current of 100 mA. Which of the two safety devices will trip?
Answer
Correct Answer:
Only the ground-fault interruptor will trip.
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30. What is the typical low-voltage cutoff for a "high" signal in transistor-transistor logic (TTL)?
Answer
Correct Answer:
2.4 V
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31. Of what safety device is this a description: A primary circuit that is magnetically coupled to a secondary circuit in which imbalance of hot and neutral current is measured?
Answer
Correct Answer:
a ground-fault interruptor
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32. Which model makes the simplifying assumption that all components in a circuit are ideal and all wires conduct perfectly?
Answer
Correct Answer:
lumped element model
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33. Of the following four types of digital latches, which one can be configured (with cross-couplings) to operate as the other three?
Answer
Correct Answer:
a JK flip-flop can operate as a set-reset latch, a data flip-flop, and a toggle flip-flop
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34. Which kind of filter is produced by placing an input voltage across the series combination of a capacitor and a resistor and using the voltage across the resistor as an output?
Answer
Correct Answer:
high-pass
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35. Consider a push-pull follower amplifier: an npn and a pnp transistor connected in series between the positive and negative terminals of a voltage supply to which signal is input to the base of each and output to ground from their collector-emitter connection. In which class is such an amplifier?
Answer
Correct Answer:
B
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36. A group of branches in a circuit forming a complete loop is called a
Answer
Correct Answer:
mesh
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37. One 50-Ohm resistor and two parallel 100-Ohm resistors have the same impedance. In which system do the resistors have lower current when dissipating 1 kW?
Answer
Correct Answer:
the system with two 100-Ohm resistors
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38. True or False? The presence of the ground lead on a three-prong alternating-current appliance plug alleviates the need for a ground-fault interruptor.
Answer
Correct Answer:
False
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39. A milliAmpere-hour is a typical unit for what quantity?
Answer
Correct Answer:
charge
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40. On a printed circuit board, what is a flux capacitor?
Answer
Correct Answer:
an exploitation of the capacitance that is due to the lateral electric flux between two adjacent printed conductors
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41. How many diodes are required to build a full-wave rectifier that employs a center-tapped transformer?
Answer
Correct Answer:
two
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42. The minimum root-mean-square magnitude of alternating currents that are likely to cause uncontrollable muscle contraction and heart fibrillation in a human are in what range?
Answer
Correct Answer:
10 to 30 mA
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43. On a printed circuit board that supports several different inductors in different circuits, are there any constraints to the layout of the inductors?
Answer
Correct Answer:
Yes, the inductors must be oriented at right angles in order to avoid coupling.
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44. What is the term to describe a multivibrator circuit with two outputs, neither of which is stable in time?
Answer
Correct Answer:
astable
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45. Which power supply takes its power from more than one source?
Answer
Correct Answer:
UPS
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46. An electrical circuit that converts AC electrical power from a lower voltage to a higher DC voltage is called a:
Answer
Correct Answer:
voltage multiplier
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47. The number of gate inputs that can be driven by a particular logic gate's output is called that gate's:
Answer
Correct Answer:
fanout limit
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48. What is the term to describe a multivibrator circuit with two outputs, one of which is stable in time?
Answer
Correct Answer:
monostable
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49. In a differentiator circuit, the output is approximately:
Answer
Correct Answer:
directly proportional to the rate of change of input
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50. What artifact results from a failure to low-pass filter a signal before analog-to-digital conversion?
Answer
Correct Answer:
aliasing
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51. Which of these statements expresses De Morgan's theorem?
Answer
Correct Answer:
NOT (A AND B) = (NOT A) OR (NOT B)
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52. What is the function of a diode clamp?
Answer
Correct Answer:
to maintain the voltage of a signal between fixed bounds
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53. What standard logic operation is represented by a household "three-way switch" in which two different switches operate the same light fixture?
Answer
Correct Answer:
XOR
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54. Which of the following statements about phase-locked loops is NOT true?
Answer
Correct Answer:
they are digital, not analog devices
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55. To what do the "rails" of an operational amplifier refer?
Answer
Correct Answer:
the potentials of the positive and negative terminals of the power supply
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56. The time between the change in a gate's input to the corresponding change in its output is called:
Answer
Correct Answer:
propogation delay
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57. In a series RLC circuit, a larger series resistance will result in a
Answer
Correct Answer:
lower Q factor
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58. How many diodes are required to a half-wave rectifier?
Answer
Correct Answer:
one
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59. How many diodes are in the bridge of a three-phase rectifier?
Answer
Correct Answer:
six
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60. What is the name for the process of splitting a signal, inverting one of the two resulting signals, transmitting both signals, inverting one of the signals upon reception of both, then summing the two signals?
Answer
Correct Answer:
differential signalling
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61. In which equivalent circuit can you replace a linear two-terminal circuit by a current source and a parallel impedance?
Answer
Correct Answer:
Norton equivalent
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62. True or False? XOR and XNOR are both associative.
Answer
Correct Answer:
True
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63. Which of these uses high frequency transformers?
Answer
Correct Answer:
switched mode power supply
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64. True or False: A multiplexer has multiple outputs.
Answer
Correct Answer:
False
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65. How is the Nyquist rate for a signal related to the bandwidth of the signal?
Answer
Correct Answer:
a wider bandwidth requires a higher Nyquist rate
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66. Which of these inductors exhibits more energy losses at higher frequencies?
Answer
Correct Answer:
ferromagnetic core inductor
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67. Which of the following is a primary disadvantage of a solid-state amplifier compared with a vacuum-tube amplifier?
Answer
Correct Answer:
poor tolerance for high -current and -voltage transients
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68. In a high-pass filter consisting of a resistor and a capacitor, how will the cut-off frequency change if the capacitance is increased?
Answer
Correct Answer:
The cut-off frequency is lower for larger capacitances.
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69. In a low-pass filter consisting of a resistor and a capacitor, how will the cut-off frequency change if the capacitance is increased?
Answer
Correct Answer:
The cut-off frequency is lower for larger capacitances.
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70. What is the name for the configuration in which an operational amplifier (op-amp) has its output connected to the non-inverting input?
Answer
Correct Answer:
positive feedback
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71. A high-voltage primary circuit is isolated with the use of an optocoupler on a secondary circuit. Does the addition of the optocoupler add inductance to either circuit?
Answer
Correct Answer:
no, the optocoupler does not add inductance
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72. What is the term to describe a multivibrator circuit with two outputs, both of which are stable in time?
Answer
Correct Answer:
bistable
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73. A JK flip-flop circuit can be assembled entirely from four of which type of digital gate?
Answer
Correct Answer:
NAND
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74. One 120-VAC circuit has two 60-W light bulbs in parallel and another 120-VAC circuit has a single 100-W bulb. In which circuit is more power dissipated?
Answer
Correct Answer:
the two 60-W parallel bulbs
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75. Which of the following is a primary disadvantage of a vacuum-tube amplifier compared with a solid-state amplifier?
Answer
Correct Answer:
high heater current
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76. What kind of feedback does a thermostat employ?
Answer
Correct Answer:
negative
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77. A kilowatt-hour is a typical unit for what quantity?
Answer
Correct Answer:
energy
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78. Consider a switch on a high-voltage circuit that is unsafe to operate manually. How might the switch be safely actuated?
Answer
Correct Answer:
by using a secondary, low-voltage relay circuit
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79. What standard circuit network often manifests as a "trim" potentiometer?
Answer
Correct Answer:
a voltage divider
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80. Consider an npn and a pnp transistor connected in series between the positive and negative terminals of a voltage supply. A signal is input to the base of each and output to ground from their collector-emitter connection. What is the common name for this configuration?
Answer
Correct Answer:
a push-pull follower
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81. In which of the following configurations do the capacitor(s) have the smallest individual voltages?
Answer
Correct Answer:
two 100-nF capacitors connected in series to 10 V
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82. On an alternating-current appliance with a three-prong plug, on which lead should the power switch be connected?
Answer
Correct Answer:
the hot lead
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83. What do you call a theoretical circuit used in analysis, that retains all of the electrical characteristics of a given circuit?
Answer
Correct Answer:
equivalent circuit
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84. A "Schmitt trigger" is a simple circuit that employs what distinctive element?
Answer
Correct Answer:
an operational amplifier
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85. Which of these is used as a construction base for prototyping of a circuit?
Answer
Correct Answer:
breadboard
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86. True or False? A Fourier-transform spectrometer is suscueptible to Gibbs ringing.
Answer
Correct Answer:
True
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87. Which of these is generally used to measure electrical resistance?
Answer
Correct Answer:
Wheatstone Bridge
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88. A type of logic gate with outputs high, low, and high impedance is called:
Answer
Correct Answer:
tri-state buffer
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89. To what does the "sample rate" of a signal refer?
Answer
Correct Answer:
how often in time the signal is sampled
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90. True or False? Differential signalling can be employed in both analog circuits and digital circuits.
Answer
Correct Answer:
True
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91. Which of these is NOT a part of a regular DC power supply?
Answer
Correct Answer:
differentiator
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92. Which of these is an active electronic component?
Answer
Correct Answer:
LED
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93. Which model is generally used for transmission lines?
Answer
Correct Answer:
distributed element model
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94. Three-phase alternating-current power is typically distributed on how many independent conductors?
Answer
Correct Answer:
three
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95. A resistor is an element that obstructs the flow of current in a circuit in accordance with
Answer
Correct Answer:
Ohm's Law
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96. In an 8-bit encoding, how many different values can be represented?
Answer
Correct Answer:
256
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97. What are the names of the three terminals on a BJT transistor?
Answer
Correct Answer:
base, collector, emitter
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98. What kind of relationship is described for impedences Z1 through Zn in a circuit, by the following equation? Z(eq) = Z1 + Z2 + … + Zn
Answer
Correct Answer:
series
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99. How many diodes are required to build the bridge in a full-wave rectifier that does not employ a transformer?
Answer
Correct Answer:
four
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100. Which of the following devices can replace a fuse in a circuit and perform the same safety function?
Answer
Correct Answer:
a circuit breaker
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101. True or False: An op-amp configured as an inverting integrator can function as a low pass filter.
Answer
Correct Answer:
True
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102. According to Kirchoff's voltage law, the sum of the EMFs in any closed loop is equal to:
Answer
Correct Answer:
the sum of the potential drops in that loop
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103. Of what safety device is this a description: A magnetic or thermal stage that engages an opening of the circuit above a critical value of current?
Answer
Correct Answer:
a circuit breaker
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104. Which of these is NOT a method used for electric circuit analysis?
Answer
Correct Answer:
Planar Method
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105. If A = 1 and B = 1 then A XOR B =
Answer
Correct Answer:
0
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106. Which of these can function as an electromagnet?
Answer
Correct Answer:
solenoid
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107. A string of decorative holiday lights is lit except for two burnt-out bulbs. Are the bulbs of the string wired in parallel or series with each other?
Answer
Correct Answer:
The lights must be wired in parallel with each other.
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108. True or False? Lightbulb power ratings are only correct for the rated voltage.
Answer
Correct Answer:
True
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109. Which of the following circuit elements is NOT likely to be found in a 120 VAC to 12 VDC adapter?
Answer
Correct Answer:
balun
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110. Which of the following is a nonlinear circuit element?
Answer
Correct Answer:
transistor
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111. An audio tuning circuit is an application of a:
Answer
Correct Answer:
band pass filter
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112. Which logic operation yield a high output for two high inputs?
Answer
Correct Answer:
AND
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113. True or False: Reactance is the opposition of a circuit element to a change of electric current or voltage.
Answer
Correct Answer:
True
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114. If in a circuit the input voltage (Vin) is applied across the series impedances Z1 and Z2 and the output is taken across Z2, what is the output voltage (Vout) given by?
Answer
Correct Answer:
[Z2 / (Z1 + Z2)] . Vin
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115. Which of these is NOT an electromechanical component?
Answer
Correct Answer:
photodiode
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116. Which of these variable resistors is non-ohmic?
Answer
Correct Answer:
varistor
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117. How does the breakdown voltage of a dielectric depend upon its thickness?
Answer
Correct Answer:
a thick layer of dielectric has a higher breakdown voltage than a thinner layer of the same dielectric
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118. The typical schematic representation of a transistor carries what one-letter abbreviation?
Answer
Correct Answer:
Q
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119. What is the approximate impedance of a universal serial bus (USB) computer connection?
Answer
Correct Answer:
50 Ohm
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120. Which of the following is a linear circuit element?
Answer
Correct Answer:
inductor
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121. Why does an "L pad" impedance-matching network bear that name?
Answer
Correct Answer:
Because the two resistors in the network are traditionally oriented in the shape of the capital letter "L" on schematic drawings.
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122. What does a Colpitts Oscillator use to produce an oscillating frequency?
Answer
Correct Answer:
inductors and capacitors
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123. The numerical values of what circuit elements are typically represented using colored stripes?
Answer
Correct Answer:
resistors
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