This is the Section 2 Module 13 of the compiled Electronics Review Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and the Internet. This particular reviewer in Electronics Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.
Electronics Engineering Reviewers: Section 2 Module 13
1. An optoisolator consists of – LED and Photo diodes
2. It is a logic gate which is used as an odd parity checker – XOR Gate
3. It is a logic gate where the output is 0 when both inputs are 0 – OR Gate
4. When 1.2 Henries is needed, it is best to use – Ferromagnetic pot core
5. Selenium is best seen in - Photocells
6. Lead Acid Batteries can be seen in – an interruptible power supply
7. Colpitts is what circuit – Oscillator
8. Type of welding where tip of electrode and base of metal are melted – SMAW (Shielded Metal Arc Welding)
9. Highest input resistance configuration – Common Collector
10. Component with highest input impedance – MOSFET
11. Simple Half wave rectifies has a minimum number of diodes – 1 diode
12. Advantage of full wave rectifier over half wave rectifiers – full rectification
13. Class A amplifiers conduct how many degrees of the input – 360 degrees
14. A Purely resistive network has – zero reactance
15. For capacitive reactance, as frequency goes down, the reactance – becomes more and more negative
16. EMF is not varied if – magnetic force and coil is moving at the same velocity
17. Proton mass is how many times the electron mass – 1836
18. Distribution of electrons in an atom - Electron configuration
19. To make an N-type material – add donor impurity
20. Computer monitors and printers are – Output Devices
21. Image resolution is important in – computer monitors
22. Advantage of laser printer over dot matrix printer – greater image quality
23. Amount of current in 1 coulomb of charge passing through a point in 1 sec – 1A
24. (S+N/N) is seen in …. – sensitivity
25. Oscilloscope capable of storing – storage oscilloscope
26. Force between ferromagnetic material and magnet – never repulsive
27. Motor best suited for heavy loads – Polyphase Motors
28. Motor with highest torque – series motor
29. Comparator with hysteresis – Schmitt trigger
30. Oscillating frequency in wien bridge is determined by – 1/2Ï€RC
31. To prevent interelectrode capacitance – wire leads must be kept short
32. In a six pole alternator what speed is required to produce 60Hz – 1200 rpm
33. Allowed to move bend reach – manipulator
34. The difference of the reference and feedback signal – actuating signal
35. The direct input signal independent of output – command signal
36. Converts light to dc signal in robotics – vision system
37. In bipolar transistors, the output electrode is – collector
38. High component density in IC - greater speed
39. Which is not an advantage of IC – lower gain
40. IC is composed of – Monolithic
41. Best to keep voltage ripple low – multiple LC circuits
42. The maximum reverse bias voltage in diodes – peak reverse voltage
43. Center tapped transformers – balanced windings
44. Is used to slightly vary the frequency in crystals – connect varactor in parallel
45. Synchronization pulses – prevents “rolling” & “folding” & “tearing”
46. Advantage of magnetic disks over magnetic tapes – stores and retrieves files faster
47. Four arm ac…… inductance to standard capacitance – Maxwell bridge
48. Thermal …. Electric …. Proportional to absolute temperature – wiedemann’s franz law
49. When two perfect sine waves with same amplitudes but opposite in phase is added – results in 0 amplitude
50. Frequency multiplication in diodes is possible because it is – nonlinear
51. Step up transformers are defined as having – secondary voltage greater than the primary voltage
52. If primary voltage is quadrupled, the turns ratio of primary to secondary impedance is – 1:16
53. Utility meter is used to measure – KW/Hr
54. ………………………….. – crystal growth
55. Power Source is needed for – ommeter
56. When you want to measure direct current using the ammeter – connect it in series
57. Ideal internal resistance of ammeter – 0
58. When adding wrist to robot arm in manipulator – add 3 degrees of freedom
59. Using 1000 ohm, 1W resistor to create 500 ohms and 7W – we connect 4 sets of 2 connected in series and the 4 connected in parallel
60. Advantage of high voltage against low voltage in long range transmission is – less I2R Loss
61. Magnetic Field is – perpendicular to the flow of current
62. The unit of magnetic field is in – Maxwell
63. Resistance of the creation of magnetic flux – reluctance
64. Converts light to DC – Photovoltaic cell
65. Holes has charge of +1 unit while electrons have - -1 charge
66. Voltage regulators or high current high voltage – switching regulators
67. When all parameter are constant – frequency
68. Oscilloscope over wide range of frequencies – stability
69. Prevents mixing of print orders in shared networks is – spooling
70. Op amp is in the shape of – triangle
71. An op amp without feedback is called – comparator
72. Voltage amplifier is also called – preamplifier
73. It is used as a comparator – op amp
74. Movement of robot from 1 place to another – cycle time
75. It is used to discharge the capacitor when the supply is off – bleeder resistor
76. Memory is – Primary storage
77. Changing first changes something, changing 2nd changes nothing – orthogonal nulling
78. Disadvantage of MOSFET – electrostatic damage
79. Splitting signals, feed 1 to tweeter and 1 to woofer – crossover network
80. Simplest converter to vary the phase of the motor – half wave converter
81. Converts AC frequency from 1 to another – cyclometer
82. Its range is 1 fifth that of wifi – Bluetooth
83. Advantage of AC to DC – can easily be stepped up or down
84. Elements of matter has – unique number of protons
85. Advantage of rheostat over potentiometer – can handle large amount of current
86. Voltmeter with high sensitivity is best used in – highly resistive networks
87. Advantage of parallel over serial – higher speed
88. Operating envelope of robot arm – range of axis of motion
89. Several resistors in series have – the same current running through them
90. In an OR gate, the output is 0 when – both inputs are 0
91. Frequency in AC is – one over the period in seconds
92. A microwave electron tube - klystron
93. Magnetic field is present due to – the movement of electric charge carriers
94. Mode of operation where you can interrupt each other – full duplex
95. Output in AC is not dependent on – the natural source used
96. Charge in an isolated system is constant due to – law of conservation of charge
97. Semiconductor – Varying conductance of material
98. Resistors in series with diodes – protect it from surge currents
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