Electronics Engineering Review Materials: Section 1 Module 28

This is the Section 1 Module 28 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 28

Item	QUESTIONS:	ANSWERS:
1	What is the effect of adding an emitter resistor in the bipolar differential amplifier	Degenerate gain
2	SCS differs in SCR because it	Has 2 gate terminal
3	What is the slew rate of the 741 op-amp	0.5 V/µs
4	What is the approximate short-circuit output of 741 op-amp	25mA
5	Class B amplification can be used to obtain low distortion for audio applications	By connecting 2 identical bipolar transistors biased at cutoff of pinch-off in a push-pull configuration
6	The ratio of rms of the pulsating quantity to its mean value	Form factor
7	Biased of base-emitter and base-collector	Forward-reverse
8	Valence electron that able to break away from its parent atom	Free electron
9	When the needle of an analog ammeter indicates infinity, the resistor being measure is	Open
10	Oscilloscope	Displaying the analog voltage of individual signal
11	The amount of energy per charge available to move electron from one point to another in an electric circuit	Voltage
12	What is the region of amplifier operation in which the coupling and bypass capacitors acts as a short	Midband range
13	Across the _____ is where the average DC voltage exists	Capacitor filter
14	What is the control element of a simple series voltage regulator	Transistor
15	The operating voltage of a reference diode in a linear voltage regulator to obtain best temperature stability is approximately ___ volts	6
16	How many conductors per slot in quadruplex coil winding in the armature of DC generator	8
17	In filter designs, the distortion _____ as the order of chebyshev and butterworth increases	Increases
18	Which of the following is a type of cell which has an advantage of maintaining a fairly constant output under varying load condition	Mercury cell
19	Typical range of quality factor for crystal oscillators	20,000
20	Current flow of exactly 50% of the signal flow	Class B
21	Class C amplifiers has a circuitry efficiency of about ___ percent	85 – 90
22	The measurement of how “pure” or “real” inductor is	Q-factor
23	Type of flip-flop in which the data are entered and appear on the output of the same clock edge	Edge triggered flip-flop
24	_____ is a type of leadthrough programming that is convenient for continuous path control robots	Manual leadthrough
25	The channel in a zero-biased JFET is normally	In a conducting state
26	what is used to determine the time difference of the inputs, outputs and flip-flop states	State table
27	State table is consists of four sections labeled as ____, ____, ____ and ____	Present state, input, output, next state
28	What is the typical breakdown voltage of a DIAC	20 – 40 V
29	What is the TRIAC voltage capability in volts	1000 V
30	In arc welding, what is the typical range of current or the power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point	50 – 450 A
31	Which of the following is NOT a diamagnetic material	Manganese
32	Ferrites are made of what material	Ceramic
33	The typical value of the triggering anode gate for SCS devices is ___ mA	1.5
34	Type of robot programming where the program is prepared on a separate computer terminal and eliminates the need of leadthrough methods	Simulation programming
35	In a switch-mode power supply, the transistor switches at the rate typically in the range of	10kHz – 40kHz
36	Type of capacitor that is mainly found in SMD form and are used extensively in RF and microwave applications	Porcelain capacitor
37	What is the range of the required frequency of ECG signal	0.05 – 150 Hz
38	Typical amplitude of differential signals between electrodes over different parts of the brain in an EEG	10 – 300 microvolts
39	The visible blue or red glow caused by ionization of the air molecules when the high voltage of a sharp, pointed wire discharges into the atmosphere is called	Corona
40	What refers to the value of current below which a silicon controlled rectifier switches from conducting to the forward blocking region	Holding current
41	The purpose of an additional RC filter section in a power supply circuit	Decreases the AC voltage component
42	The current gain of a common base BJT configuration is	Just less than 1
43	What type of core that has high flux density like iron but is an insulator	Ferrite core
44	What type of core when used in a coil, has minimum eddy current losses due to its resistance	Ferrite core
45	Exhibits an equiripple amplitude in the pass band	Chebyshev filter
46	Exhibits maximum flatness possible in the pass band	Butterworth filter
47	What is the ratio of the DC output power at the load to the power rating (volt-ampere) of the transformer	Transformer utilization factor
48	What type of instrument transformer is used to measure or monitor the voltage on transmission lines and to isolate the metering equipment from the lines	Potential transformer
49	A circuit whose output voltage is proportional to the area under the curve of the input voltage is called	Integrator
50	A circuit whose output voltage is proportional to the slope of the input voltage is called	Differentiator
51	An amplifier with an output voltage proportional to the average of all the input voltages	Averaging amplifier
52	What refers to the force that holds the electrons in the orbit	Electrostatic force
53	What meter is used to measure AC currents, generally from the 60Hz AC power signal without breaking open the circuit	Amp-clamp probe
54	What is the frequency-determining component in the Wien bridge oscillator	Resistors and capacitors
55	The specified value of holding current for SCRs means that the	Device will turn off when the anode current falls below this value
56	Gas tungsten arc welding (GTAW) can produce a temperature up to _____ degree Fahrenheit	35,000
57	To ensure stable operation, op-amps are built with internal compensation circuitry, which also causes the very high open-loop gain to diminish with increasing frequency. The gain of reduction is referred to as	Roll-off
58	In logarithmic amplifier, where and how is the diode placed in the circuit to work as	Forward biased in the feedback, replacing the Rf of an inverting op-amp
59	Connecting the output to the input of the other	Cascading
60	An industrial welding technique where high frequency ultrasonic acoustic vibrations are locally applied to workpieces is called _____ welding	Ultrasonic
61	In a typical transistor amplifier active region, the VCE is usually ____ percent of the VCC	25 – 75
62	Generation of small voltage in the depth of a conductor	Hall effect
63	Quartz crystal when stress is applied	Piezoelectric effect
64	Reduction of voltage measurement in a voltmeter	Loading effect
65	Inability of a capacitor to completely discharge to zero	Dielectric effect
66	Typical range of a ceramic disk type capacitor	1pF – 0.22 F
67	Electromagnetic spectrum wavelength range in nanometer of germanium materials used in photodiode	400 – 1700
68	If the feedback signal (current or voltage) is applied in such a way that it is in-phase with the input signal and thus increases, the feedback is a ______ feedback	Positive
69	Regenerative feedback or direct feedback	Positive feedback
70	Temporarily stores the most recently used data	Cache memory
71	What refers to a non-volatile read/wire random access semiconductor memory in which data are stored in the floating charge of any type of FET	Flash memory
72	Has a 180° phase shift	RC phase shift oscillator
73	Most common local oscillator in a superheterodyne radio receiver	Colpitts
74	Composed of a diode, capacitor and transistor which is used to shift the level of a signal	Clamper
75	“all or nothing” gate	AND
76	What type of lead in ECG is used to record the voltage differential between the wrists and legs	Bipolar
77	The higher the Q-factor of the inductor,	The fewer losses are there
78	In industrial robotic arm, it must have a capacity from 1kg to ____ kg	300
79	In a good differential amplifier, what is the typical range of values of CMRR	80 – 100 dB
80	What type of battery is used in pacemakers	Lithium iodide
81	A pulsating DC voltage is which of the following application	Battery charger
82	What refers to the type of charging where the charger and the battery are always connected to each other to supply current in the load	Floating charge
83	Switch-mode power supply is a converter circuitry that consists of arrangement of ____, ____, ____ and ____	Inductor, capacitor, diode, transistor
84	What is a dc-dc converter with an unregulated input DC voltage and regulated output voltage	Switch-mode power supply
85	What is a relaxation oscillator where frequency can be changed by varying the output DC control voltage	Voltage controlled oscillator
86	To start oscillation, BA must be greater than 1 and the	Phase shift around the feedback network must be 180°
87	What is the ratio of the input impedance with series feedback to that without feedback	1 + BA
88	To obtain self-sustained oscillation, the condition must be which of the following	BA = 1
89	____ motor is solar-powered, magnetically levitated electric motor wich consists of a four-sided rotor	Mendocino
90	Which of the following is a disadvantage of a CMOS device	They can be damaged by electrostatic discharges
91	What is the typical range of ferrite relative permeability	50 – 200 V
92	_____ provides shortcut for finding the common voltage between any number of parallel branch	Reciprocity theorem
93	The current gain of a Darlington pair is	Superbeta
94	Difference between the two op-amps input currents	Input offset current
95	_____ rectifier are formed from stacks of square or round, aluminum or steel plated with a 1 micrometer of bismuth or nickel	Selenium
96	Silicon carbide semiconductor materials are used in thyristors because it is capable to operate at temperature of up to ____ degree Celsius	350
97	Force applied in the reverse direction to reduce flux density to zero	Coercive force
98	Time between the changing state of the input and the beginning of the response in the output	Delay time
99	The process of shrinking the size and power dissipation of an electronic circuit which uses surface mount technology	Microminiaturization
100	Class B amplification can be used to obtain low distortion for audio applications	By connecting 2 identical bipolar transistors biased at cutoff of pinchoff in a push-pull configuration

Section 1 Modules: Reviewers in Electronic Engineering

Reviewer for Section 1 Modules in Electronics Engineering (Q&A)

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