This is the Section 2 Module 5 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 5
Question |
Answer |
1. The charge of a neutral carbon atom |
0 |
2. What is the purpose of doping |
To give a semiconductor material certain properties |
3. The stray-wiring capacitance only affects at |
Upper cut-off frequency |
4. The collector drain current is |
Total current of the dc source |
5. The difference in the input bias currents |
Input Offset Current |
6. If the base resistance is open, the q point is in |
the lower end of load line |
7. The ripple factor for a full wave rectifier |
0.48 |
8. does the current conduct in a class B amplifier |
Half of the input cycle |
9. If an electron has a unit charge of negative 1, the hole has a unit charge of |
+1 |
10. Most commonly used LC oscillator |
Colpitts oscillator |
11. Eddy Current aids to |
The core loss |
12. Which provides the largest gain of the three configurations |
Common emitter |
13. The differential voltage happens at the what stage of the op-amp |
First stage |
14. The center-tap is commonly seen in the |
Balanced winding |
15. The series voltage regulator is much efficient than the shunt voltage regulator since |
It turns on and off the pass transistor |
16. Which impurity is added to produce a P-Type |
Acceptors |
17. The output of a relaxation oscillator |
Square Wave |
18. In a mesh, the algebraic sum of voltages entering and leaving a node is zero |
Kirchoff’s Second Law |
19. Which of the following regarding the average voltage and rms voltage is true? |
The rms voltage is always greater than the average voltage |
20. What is the output voltage of the 78*** regulators |
Positive |
21. How are EMOSFET triggered? |
Threshold Voltage |
22. The Thevenin Resistance is equal to |
The internal resistance of a norton circuit |
23. A stable circuit with a variety of amplifier impedance uses |
Optoisolator |
24. Breakdown voltage of a zener diode is |
Approximately constant |
25. RC snubber protects SCR against |
False triggering |
26. A graphic equalizer is a form of |
Tone control |
27. In regulators, the device that controls the amount of current/voltage/power |
Control element |
28. Clock periods are measured from |
Similar points on the clock waveform |
29. A kelvin electrostatic voltmeter uses |
Fluid friction |
30. Input impedance of JFET is |
Infinity |
31. Efficiency of a linear regulator is high when |
Headroom voltage is low |
32. In a buck regulator, the output voltage is filtered with a |
Capacitor-input filter |
33. When the two input terminals of a differential amplifier are grounded, |
The output error voltage exist |
34. Unity gain frequency of a 741C IC is |
1MHz |
35. Dropout voltage of IC |
2V |
36. The cut-off frequency is equal to the unity gain divided by |
Closed loop voltage gain |
37. An elliptical approximation has |
Rippled stopband |
38. In a shift register, a clock signal indicates |
When to shift a bit of data from input of a flipflop to output |
39. To improve the DC output voltage of a DC supply |
Filter capacitor may be installed |
40. To service a power supply which you are not familiar with, |
Leave it alone and have a professional work on it |
41. Efficiency of a voltage regulator is high when |
Little power is wasted |
42. The change in input offset voltage due to change in temperature is |
Input offset voltage drift |
43. Susceptance and conductance adds to form |
Admittance |
44. An EMOSFET can be recognized as |
A broken vertical line inside a circle |
45. Complex number are used in impedance since |
It provides a way to represent what happens in the resistance-reactance circuits |
46. Bandstop circuits are also called |
Notch filters |
47. Selenium works well in |
Photocells |
48. Which does not increase loss in transmission lines |
Reducing power output of the source |
49. In op-amp, the input offset voltage is represented as a |
Larger than open loop input impedance |
50. Closed loop input impedance of a VCVS |
Battery |
51. In npn transistors, the electrons in the emitter have enough energy to overcome the barrier potential of |
the base to emitter junction |
52. the base to emitter voltage of an ideal transistor is |
0 |
53. Blown fuse indicator uses |
Light emitting diode |
54. Inductive susceptance is measured in |
Siemens |
55. It has a negative resistance region |
Tunnel diode |
56. ICVS amplifier circuits approximates an ideal |
Current to voltage converter |
57. Most power FETS are used in |
High current applications |
58. Ferromagnetic coils are not good in RF oscillators because |
Air core coils have better thermal stability |
59. In a TTL, when Schottky diode is added to the base to collector terminal, it results to a Schottky TTL. A schottky TTL |
Increases switching speed |
60. An IMPATT diode are used in |
Microwave oscillators |
61. PMOS are supplied with voltage up to |
24V |
62. If you need exceptionally good ripple filtering, the best approach is to use |
A capacitor/choke sections |
63. To prevent damage to a multirange ammeter, |
Ayrton shunt is used |
64. The voltage at emitter is 0.7 less than the |
Base voltage |
65. The simplest way of protecting power supplies from reverse polarity is |
Reverse biased diodes |
66. Bandwidth of Class C amplifier decreases when |
Q increases |
67. If you need a winding L of 1.5H we use, |
Ferromagnetic pot core |
68. Each degree rise in junction temperature decreases barrier potential by |
2mV |
69. For ac amplifiers, what parameter affects its performance |
Slew rate and frequency response |
70. A comparator with a trip point of zero is also called |
Zero-crossing detector |
71. A zener diode is |
A constant voltage device |
72. What instrument having recognized with permanent values that is used as reference |
Standard Instruments |
73. In a parallel RLC circuit, and you need to find the complex impedance, |
Find the net conductance and susceptance then convert to its resistance and reactance then add it together as R+jx |
74. Increase of line voltage in a power supply |
Decreases the efficiency |
75. A Colpitts oscillator can be recognized by |
A split capacitor in the tuned circuit |
76. A wien-bridge oscillator is also called a |
Notch filter |
77. A VCVS amplifier has no output voltage, what is the problem |
Shorted load resistance |
78. In an N-channel JFET, pinchoff occurs when the gate bias is |
Very negative |
79. Majority carriers in the emitter of a PNP transistor |
Holes |
80. The best filter for a power supply |
A capacitor in parallel and a choke in series |
81. How will you handle unsaved inputs in a logic gate |
Pull them down or up depending on the circuit function |
82. If the emitter resistance is doubled with TSEB, the collector current will |
Drop in half |
83. If a CE stage is directly coupled to an emitter follower, how many coupling capacitors are there between the 2 stages? |
0 |
84. The toroid core is better than the solenoid because |
It confines the magnetic flux |
85. If a JFET is used in an AGC, it acts as a |
Voltage-controlled resistor |
86. To decrease the distortion in amplified signals, you must increase the |
Emitter feedback resistor |
87. The zero-adjust control knob in an analog ammeter is for |
Compensating the internal battery |
88. Without current limiting, when the load resistor is shorted |
It destroys diodes and transistors |
89. Instruments used to measure exceeding the mercury thermometer |
Pyrometer |
90. Which of the following has no insertion error |
Clamp-meter |
91. The electrons in NPN transistors do not recombine because |
They have a long lifetime |
92. In analyzing emitter-based configurations, the first step is to obtain |
Base current |
93. To obtain a butterworth response in an 8th order filter, the stages must have |
Staggered Qs |
94. In flip-flop arrangements, the first receives its input in the positive cycle and the other receives its input from the output of the first in the negative cycle |
Master/slave Flip-flops |
95. If you increase the internal temperature in power FETs, |
The drain current decreases |
96. If the IC linear regulator is a few inches between the filter capacitor, the IC will oscillate unless |
Use a bypass capacitor in the input |
97. If the input of the emitter-follower increases the output will be |
Clipped |
98. A non-inverting amplifier has |
A high closed-loop input impedance |
99. A group of oscillators forming a loop |
Ring counter |
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