This is the Section 1 Module 19 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 1 Module 19
1. The science of physical phenomena at very low temperatures, Approaching absolute zero
- Cryogenics
2. Error in signal is zero in closed loop system
- Null
3. Has high initial cost
- Hydraulic
4. Has high force actuator
- Hydraulic force
5. Wasteful current (heat)
- Eddy current
6. Loss in a transformer that is due to changing field
- Hysteresis loss
7. Error due to observer
- Observational error
8. Error due to harsh environment
- Environmental error
9. A device that contains more than one diode. E.g. is FW bride type rectifier IC.
- Diode pack
10. Class of amplifier that has an output voltage angle of 360o
- Class A
11. I half wave rectifier, how many % the dc output voltage is the ac input voltage
31.8%
12. Efficiency of transistorized class C amplifier
33%
13. Error in voltmeter reading
- Loading
14. Decrease in the value of shunt generator
- Current reading capacity increased (ammeter)
15. Increase in the value of series resistor
- Voltage reading capacity increased (voltmeter)
16. Disadvantage of electric actuator
- All of the choices (force is limited, very little holding strength when stop)
17. Number of valence electron for stability
8
18. Why are the field poles and armature of a dc machine laminated.
- decrease eddy current
19. Instruction in a source language that is replaced y a define sequence of instructions in the same source language.
- Macro instruction
20. Transistor in which the Base is diffused, emitter is alloyed. The collector is provided by the semiconductor substrate into which alloying and diffusion are affected.
- Alloyed-diffused transistor
21. Whirlwind I
20,000 instruction per second
22. First computer in 1946
- ENIAC
23. Two region of operation of SCR
- Conducting and non-conducting
24. Bipolar family of transistor with resistor at input
- RTL
25. A silicon diode that exhibits a very high resistance in both directions up to certain voltage, beyond which the unit switches to a low resistance conducting state. It can be viewed as two zener diodes connected back-to-back in series.
- Thyrector
26. The voltage decreased across the Anode (A) and cathode (K) of an SCR from non-conducting state to conducting state.
- Breakover voltage
27. General term of electronic devices used to control or trigger large-power switching devices.
- Breakover device
28. To control the speed of dc motor
- Varying field strength
29. Autotransformer the primary and secondary are coupled
- Electrically and magnetically
30. Less dissipated power and generates less heat
- Switching regulator
31. Ac power supply does not have this component
- Rectifier
32. The time required for forward voltage or current to reach a specified value after switching the diode from its reverse-to-forward-biased state.
- Forward recovery time
33. Cobalt is a
- Ferromagnetic
34. Forces in meter instruments
- Damping, deflecting and controlling
35. Graph of the Product of VCE and IC in the transistor output characteristic curve.
- Maximum power curve
36. Grounded base, base terminal is common to emitter and collector
- Common-base
37. Error due to physical…
- Parallax error
38. Transformers having ratings less than 5kVA are generally
- Natural air cooling
39. Basis of operations of semiconductor Photoconductor
- EHP optical generated
40. Behaves as BJT I terms of switching
- Enhancement type MOSFET
41. Free carrier decrease
- Decrease in conductivity but increase in resistance
42. Has doping elements of both donor and acceptor
- Compensated semiconductor
43. Transistor amplifier configuration to eliminate miller effect
- Cascode amplifier
44. To trigger the device using SCR in dc gen
- Firing angle
45. During welding, current flow through the system
- Heat subinterval
46. In testing or checking transformer, it is always in
- Low voltage
47. Connected in parallel with load
- Shunt regulator
48. Iron core transformer is suited for
- High voltage low current
49. The capacity of a substance to become magnetized, and expressed as the ratio between the magnetization produced in a substance to the magnetizing force producing it.
- Magnetic susceptibility
50. Can display waves of CRT
- Oscilloscope
51. When primary of the transformer is connected in the dc output
- It might burnt out
52. Characteristics of magnetic lines of force
- Travels from north to south through the surrounding medium of the bar magnet
53. 3 terminal voltage regulator IC that has a variable negative voltage output
337
54. 7924 ic voltage regulator has
-24 V
55. To switch off the DMOSFET, the channel should be depleted. Depletion of the cannel is done by applying enough voltage across the gate-source terminal. What do you call this voltage?
- Pinched off voltage
56. Carbon brushes used in dc generator because
- It lubricates and polishes
57. When all leg are balance
- Balance bridge
58. Why are carbon brushes preferable compared to copper brushes
- To reduce sparking
59. Common IC used for positive regulated voltages
78xx
60. In a thermocouple, one produced heat and one absorbs heat
- Peltier Effect
61. Is the combination of the inductance of lead and electrodes, capacitance and resistance of the junction of the semiconductor diode.
- Diode impedance
62. Which is not a flip flop
- Register ( choices are: RS, latch, D and register)
63. Program that Translates and then immediately executes statements in high level language.
- Interpreter
64. Breakover device that is basically a diode
- Trigger diode
65. Same characteristics as in quadrant I of SCR
- Shockley diode
66. Capacitance significant when the diode is forward biased
- Diffusion capacitance or storage capacitance
67. Dc-ac converter
- Inverter
68. Tank with input and feedback component
- Hartley
69. Ratio of outer layers to the sandwiched material
- 10:1 or less
70. An electronic switch that has the highest single-device current capacity and can withstand overloads better.
- Ignitrons
71. Can convert mechanical to electrical capacity used for heavy loads
- Polyphase motor
72. Both AM and FM amplification
- Class S
73.
- Server/client computing
74. Force required to counter retentivity and thus eliminating residual magnetism
- Coercive force
75. The amount of magnetizing force to counter balance the residual magnetism of the magnetic material
- Coercivity
76. Characteristic of resistive material which do not change its resistive value with respect to time
- Stability
77. Defined for each of the parameters affecting bias stability
- Stability factor
78. fun out is not enough
- buffer
79. to prevent oscillation in pointer
- by damping
80. atomic weight of 8 protons and 8 neutrons added two another neutrons
- 18
81. How many NAND gates to produce OR
- 3
82. How many times per second does an SCR is turned ON and OFF when it is operated in a full-wave phase control at a line frequency of 60 Hz.
- 120 (FW)
83. If a voltmeter measure high out impedance it needed
- High input impedance
84. Shunt meter has ______ temperature coefficient of resistor
- Very small
85. System in which th precise movement of large load is controlled by a relatively weak control signal
- Servo
86. Donor impurities
- AOTA (antimony, bismuth, arsenic, all of the above)
87. Configurations used in robots
- AOTA (cylindrical, spherical, arm/joint, all of the above)
88. * sa scr decrease in gate
- Decrease
89. Power supply filter gives the smallest ripple voltage
- Multisection LC filter
90. A system program used to translate directly an assembly language to machine language
- Assembler
91. Spectrum analyzer
- Real time analyzer
92. Term used to expressed the amount of electrical energy in an electrostatic field
- Joule
93. Basic FET
- JFET
94. Core flux in transformer
- Alternating
95. The sum of all the variable divided by the total number of variable
- Arithmetic mean
96. A chopper, employing alternately biased diode as a switching material
- Diode chopper
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