This is the Section 2 Module 1 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 1
1.) What is the common characteristics of a step-up transformer?
Primary voltage is lower than secondary voltage
2.) What is the common characteristics of a step-down transformer?
Primary voltage is higher than secondary voltage
3.) What measures the radiation in the Sky?
Pyranometer
4.) Advantage of Magnetic Disk over Magnetic Tape?
Easy storage and easy retrieval
5.) What best represents X leads Y by 270 degrees?
X lags Y by 90 degrees
6.) What motor has the lowest starting torque?
Shunt motor
7.) Advantage of JK over RS flip-flop?
More Predictable outcomes
8.) Disadvantage of CMOS?
Easily damaged by Static Electricity
9.) Why is Carbon brushes preferred over Copper Brushes?
It has less arcing
10.) What is a fuse that is composed of a straight wire inside?
Quick blow fuse
11.) What does R/Z represents?
Power factor
12.) If X is high, in a NAND circuit what is Y?
Low
13.) Where are LED’s commonly seen among the choices?
Digital Frequency Display
14.) What do you need to vary the frequency of a crystal oscillator?
Variable Capacitor
15.) What happens to the resistor ratio when the secondary voltage is quadrupled?
1:6
16.) What is a flip-flop that is triggered at the same time?
Clocked flip-flop
17.) What diodes are commonly used in a Microwave Transmission?
IMPATT diode
18.) What reduces the gain in an OP-AMP?
Negative Feedback
19.) Which does not affect the Capacitance in a Capacitor?
Frequency (Within Reason)
20.) What does FTP abbreviate for?
File Transfer Protocol
21.) What do you need to connect a microcomputer to a network?
Network Interface Card
22.) Comprises of SSCP, PU and LU?
System Network Architecture
23.) What circuit protects from overvoltage?
Crowbar Circuit
24.) What is the ripple frequency of a full-wave Rectifier?
Twice that of a half-wave Rectifier
25.) What controls the firing of SCR?
Trigger Circuit
26.) A class A amplifier has _______.
360 degrees of input cycle
27.) In a parallel circuit, how does Susceptance add up?
It simply adds up
28.) What is the phase difference in a three-phase AC?
120 degrees
29.) A characteristic of an oscillator?
It does not have a negative feedback
30.) Time domain is commonly seen in an ____.
Oscilloscope
31.) What is the equivalence of Reactance Power?
Imaginary Power
32.) What determines the efficiency of the generator?
Output power divided by the driving power
33.) What is a device that produces an output for 10 input pulses?
Decade scaler
34.) What is an advantage of CCO over VFO?
Low drift
35.) What commonly uses IC?
Digital computer
36.) Damping method used in a dynamometer?
Air Friction
37.) What converts different networks in different Protocols?
Gateway
38.) What happens when a Capacitance has a negative Temperature coefficient?
As temperature goes down, capacitance goes up
39.) What is a device that checks the current without opening the circuit?
Clamp Probe
40.) What do you need to cascade an NMOS to a CMOS?
Pull-up resistor
41.) What happens if there is a reactance in the output of a transmission line?
Mismatch will happen
42.) What protects the active component during turn-on?
Snubber Circuit
43.) Commonly used Regulator in the industry?
78XX
44.) Disadvantage of Transformer Coupling?
It costs too much
45.) In a parallel-bulb circuit, when one bulb is shorted-out,
you must always have a fuse or circuit breaker
46.) What happens when the fuse that you replaced has a lower current rating than the previous fuse?
The fuse will blow right away
47.) What does a beat frequency oscillator do?
Detects CW
48.) What is true about an auto transformer?
It has only one-tap winding
49.) Commonly used in Semiconductor aside from Aluminum?
Gallium Arsenide
50.) Disadvantage of Gallium Arsenide?
Expensive to use
51.) When a PN junction is forward-biased,
the Anode is positive with respect to Cathode
52.) What is the current carrying part in a FET?
Channel
53.) What is easy to access but cannot be modified?
ROM
54.) What device will require a large transformer?
TV station transmitter
55.) What is the magnetic flux ratio of primary winding to secondary winding?
Coefficient of coupling
56.) What is NO break power transfer?
The new generator is inserted while the old generator is still in line
57.) What is break power transfer?
The generator is inserted when the old generator is removed
58.) What is commonly used in hi-fi amplifier?
Class B
59.) What does voltage-doubler power supply do?
Produces low current and high voltage output
60.) Language higher than high-level language?
4GL(4th generation language)
61.) What is least susceptible to noise?
TTL(Transistor-transistor Logic)
62.) What OP-AMP compares voltages?
Comparator
63.) What controls the cut-off or pinch-off voltage?
Gate
64.) What is a platter?
It is part of the hard disk
65.) What should be considered in a transmission line?
Minimizing the loss
66.) In p-type transistors,
electrons are minority carriers
67.) What does a shell core do in a transformer?
Maximizes coupling
68.) Why magnetron’s electron flow is spiral?
Due to its longitudinal magnetic wave
69.) Technique used in minimizing ripple?
Regulation
70.) Commonly used device in household appliance involving dc voltages?
Rectifier
71.) In a P-channel JFET,
the gate is negative relative to the source
72.) JFET’s characteristic curve involves the
drain voltage as a function of drain current
73.) Given a frequency, what happens to the reactance when the frequency increases?
Gets more and more negative
74.) Reactance in a transmission line is independent of the current in it
75.) Junction in a p-type transistor that negates the flow of capacitance? Junction Capacitance
76.) In a transformer, Maximum efficiency is achieved when constant loss=
copper loss
77.) In core-type transformers,
shorter-magnetic path is achieved
78.) In-phase breakdown does not affect the failure of an oscillator
79.) What is needed to modify an amplifier to be used in hi-fi applications?
2 push-pull external transistors
80.) Are ferromagnetic-core coil better than Air-core coil in transformers?
No!
81.) Type of diode that is used for tuning receivers?
Varactor diode
82.) In a current transformer, when the primary coils are energized the secondary coil should not be energized
83.) The effect of leakage flux is to cause voltage drop in the windings
84.) The advantage of full-wave rectifier is that it operates in both cycles whereas half-wave rectifier operates in one of the cycles
85.) If a power transformer is operated at very high frequencies, core loss will be excessive
86.) A device that has a magnet that is perpendicular to the direction of the flux?
Magnet-moving equipment
87.) In a PNP-type transistor, the collector is negative with respect to the emitter
88.) Disadvantage of CMOS?
Cannot withstand higher voltages
89.) What does negative feedback do in an amplifier?
Reduces gain
90.) Deviation is the difference between a value of an observation and the mean of the population in statistics
91.) Bipolar transistor?
Collector is negative relative to the emitter
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