1. ECE Board Exam November 1995
What is an electronic measuring equipment used in navigation operating in 1GHz band which provides bearing and distance indication?
- A. TACAN
- B. ODR
- C. ILS
- D. DME
2. ECE Board Exam November 1995
Find the output of four (4) lead acid cells.
- A. 3.2 V
- B. 8.4 V
- C. 5.8 V
- D. 1.6 V
3. ECE Board Exam November 1995
The reciprocal of capacitance is called
- A. elastance
- B. permittivity
- C. conductance
- D. permeability
4. ECE Board Exam November 1995
An advantage of full-wave rectifier over half-wave rectifier.
- A. Each diode can cool-off during half of each input cycle.
- B. The ripple frequency is lower.
- C. The tube will conduct during both halves of the cycle.
- D. Output voltage is lower with more ripples.
5. ECE Board Exam November 1995
What composes all matter whether a liquid, solid or gas?
- A. Atoms
- B. Electrons
- C. Protons
- D. Neutrons
6. ECE Board Exam November 1995
What is the majority carrier in an N material?
- A. Holes
- B. Neutrons
- C. Electrons
- D. Protons
7. ECE Board Exam November 1995
A very high resistance connected in parallel with smoothing capacitors in a high voltage DC system is called a
- A. dropping resistor
- B. shunt
- C. divider
- D. bleeder
8. ECE Board Exam November 1995
What is the smallest part of a computer language?
- A. Binary
- B. Byte
- C. Bit
- D. Word
9. ECE Board Exam November 1995
A user-program that has the ability to move a robot axis to any position within its range
- A. Point-to-point
- B. Continuous path
- C. Positive stop
- D. Pick-and-place
10. ECE Board Exam November 1995
What level is used to represent logic-1 in a negative logic circuit?
- A. Negative transition level
- B. Low level
- C. Positive transmission level
- D. High level
11. ECE Board Exam November 1995
What law in electronics where an induced current will be in such a direction that its own magnetic field will oppose the magnetic field that produces the same?
- A. Electromagnetic law
- B. Nortons law
- C. Lenz law
- D. Maxwells law
12. ECE Board Exam November 1995
What is the reason why robot actuators have lesser capabilities than electric or hydraulic robot actuators?
- A. It has quick response
- B. It always has oil leaks
- C. It always has all or nothing motion
- D. It has high initial cost
13. ECE Board Exam November 1995
_______ has the unit of electron volt.
- A. Charge
- B. Potential difference
- C. Energy
- D. Current
14. ECE Board Exam November 1995
What is the unit of magnetic flux in SI system?
- A. Weber
- B. Maxwell
- C. Tesla
- D. Gauss
15. ECE Board Exam November 1995
What element possesses four valence electrons?
- A. Insulator
- B. Semi-insulator
- C. Semiconductor
- D. Conductor
16. ECE Board Exam November 1995
What level is used to represent logic-0 in a negative logic circuit?
- A. High level
- B. Low level
- C. Negative transition level
- D. Positive transition level
17. ECE Board Exam November 1995
In an Amplitude-Modulated (AM) radio transmitter, the modulator is _________.
- A. How amplification can be thought of as a decision making process
- B. How semiconductor replace vacuum
- C. A digital decision
- D. How to adapt a radio transmitter to make it useful as multiplier circuit.
18. ECE Board Exam November 1995
Which of the following is the probable output if all inputs of a TTL gate are binary 1?
- A. Determinable
- B. Binary 0
- C. Binary 1
- D. Indeterminate
19. ECE Board Exam November 1995
Term used to describe sudden reverse conduction of an electronic component caused by excess reverse voltage across the device.
- A. Cut-off
- B. Saturation
- C. Avalanche
- D. Revertion
20. ECE Board Exam November 1995
Given the two voltages:
S(t)=10cos(ωt+30 degrees) volts
Q(t)=15cos(ωt+45 degrees) volts
Find V(t)=S(t) + Q(t)
- A. V(t)=5.9cos(ωt+71degrees) volts
- B. V(t)=24.8cos(ωt+39degrees) volts
- C. V(t)=25cos(ωt+75 degrees) volts
- D. V(t)=13.6cos(ωt+75degrees) volts
21. ECE Board Exam November 1995
What type of materials formed when trivalent material is doped with silicon or germanium?
- A. N type
- B. N and P type
- C. PN type
- D. P type
22. ECE Board Exam November 1995
What is the degree of exactness of measurement when compared to the expected value of the variable being measured?
- A. Accuracy
- B. Error
- C. Deviation
- D. Precision
23. ECE Board Exam November 1995
The overall gain of an amplifier in cascade is
- A. the sum
- B. the average of each
- C. the product
- D. 100 % the sum
24. ECE Board Exam November 1995
_________ is a byte of data stored in a memory location.
- A. 8 bits
- B. Character
- C. 4 bits
- D. Memory word
25. ECE Board Exam November 1995
An instrument used to measure one location in terms of coordinates.
- A. Global Positioning System
- B. Hydrometer
- C. Altimeter
- D. Increductometer
26. ECE Board Exam November 1995
How do you measure the current in a circuit without an ammeter?
- A. By computing the values of resistance
- B. Measure voltage drop across tube
- C. Measure voltage drop across known resistor
- D. Divide total circuit resistance by the total circuit load
27. ECE Board Exam November 1995
_________ is retrieving data from memory.
- A. Accessing
- B. Getting
- C. Encoding
- D. Reading
28. ECE Board Exam November 1995
Materials with permeabilities slightly less than that of free space are referred to as
- A. diamagnetic
- B. ferromagnetic
- C. non-magnetic
- D. paramagnetic
29. ECE Board Exam November 1995
________ can erase EPROMS.
- A. Applying a 21-volt pulse
- B. Applying ultraviolet rays
- C. Turning off the power
- D. Blowing fuse
30. ECE Board Exam November 1995
What materials possess permeabilities slightly less than that of free space?
- A. Non-magnetic
- B. Diamagnetic
- C. Paramagnetic
- D. Ferromagnetic
31. ECE Board Exam November 1995
An LC circuit resonates at 2000 kHz and has a Q of 100. Find the lower and upper cut-off frequencies.
- A. 1950 kHz, 2050 kHz
- B. 1900 kHz, 2100 kHz
- C. 1990 kHz, 2010 kHz
- D. 1980 kHz, 2020 kHz
32. ECE Board Exam November 1995
Find the ripple factor (Kr) of a sinusoidal signal with peak ripple of 4 volts and an average of 30.
- A. 0.094
- B. 0.013
- C. 0.130
- D. 0.94
33. ECE Board Exam November 1995
The term “Fully Saturated” for a transistor refers to:
- A. the collector current at its maximum value
- B. the collector current at its minimum value
- C. the transistor’s beta at its maximum value
- D. the transistor’s alpha at its maximum value
34. ECE Board Exam November 1995
The _________ grid in an electron tube is where the input signal is usually applied.
- A. screen
- B. control
- C. bias
- D. supression
35. ECE Board Exam November 1995
If three amplifiers with a gain of 8 each are in cascade, how much is the overall gain?
36. ECE Board Exam November 1995
_______ is a pn junction semiconductor device that emits noncoherent optical radiation when biased in the forward direction, as a result of a recombination effect.
- A. LASER
- B. JUGFET
- C. LED
- D. Optical cavity
37. ECE Board Exam November 1995
What do you call the force which sets up or tends to set up magnetic flux in a magnetic circuit?
- A. Electromotive force
- B. Potential difference
- C. Magnetomotive force
- D. Dynamic force
38. ECE Board Exam November 1995
Silicon diodes are used in a two-diode full-wave rectifier circuit to supply a load of 12 volts DC. Assuming ideal diodes and the load resistance is 12 ohms, compute the efficiency of the rectifier in percentage.
- A. 5.8
- B. 75
- C. 95.7
- D. 81.2
39. ECE Board Exam November 1995
In order to match the load to the generator means making load resistance _________.
- A. increased to more of generator’s internal resistance
- B. equal to generator’s internal resistance
- C. decreased
- D. lowered than generator’s internal resistance
40. ECE Board Exam November 1995
The purpose of installing thyrectors across the incoming power lines to speed the control system is to ______.
- A. cause the motor to caution
- B. protect drive circuits from high voltage transient surges
- C. increase counter-emf
- D. allow the field winding current to continue flowing
41. ECE Board Exam November 1995
The base SI unit of luminous intensity is
- A. lux
- B. lumen
- C. candela
- D. lambert
42. ECE Board Exam November 1995
The portion of the weld interval during which welding current is flowing
- A. Heat subinterval
- B. Release interval
- C. Cool interval
- D. Squeeze interval
43. ECE Board Exam November 1995
The difference in energy between the valence and conduction bands of a semiconductor is called
- A. band gap
- B. extrinsic photoeffect
- C. conductivity
- D. energy-density
44. ECE Board Exam November 1995
________ is a segment register which normally accesses variables in the program.
- A. Extra
- B. Stack
- C. Data
- D. Code
45. ECE Board Exam November 1995
What is the range of audio frequency?
- A. 10 to 10,000 Hz
- B. 16 to 20,000 Hz
- C. 3 to 2,000 kHz
- D. 10 to 2,000 Hz
46. ECE Board Exam November 1995
A __________ is a storage device used to accommodate a difference in rate of flow of data or time of occurrence of events when transmitting from one device to another.
- A. Accumulator
- B. Buffer
- C. Modem
- D. Register
47. ECE Board Exam November 1995
Solve the collector current if base current is 200 mA and the current gain is 20.
- A. 10 A
- B. 4 A
- C. 1 A
- D. 40 A
48. ECE Board Exam November 1995
_____ is the specific gravity reading for a good lead-acid cell.
- A. 1170
- B. 1270
- C. 1070
- D. 1370
49. ECE Board Exam November 1995
___________ refers to BCD counter
- A. Decade counter
- B. Shift relay
- C. Frequency divider
- D. Binary counter
50. ECE Board Exam November 1995
The typical number of bits per dynamic memory location is
51. ECE Board Exam November 1995
Find voltage regulation of a generator when full-load voltage is 110 V and no-load voltage is 120.
- A. 1 %
- B. 9.09 %
- C. 90.0 %
- D. 10 %
52. ECE Board Exam November 1995
In a system with MOS devices, the main bus loading factor is likely to be
- A. resistive
- B. current
- C. capacitive
- D. static charge
53. ECE Board Exam November 1995
The first recipient in E-mail communication.
- A. Host
- B. Mail box
- C. Computer`
- D. Disk
54. ECE Board Exam November 1995
When a power supply is constructed to operate from either 240V or 120V ac lines such that it will have same secondary output, its primary when connected from 240V must be
- A. split into halves and connected in parallel
- B. connected in series
- C. connected in parallel
- D. split into halves and connected in series
55. ECE Board Exam November 1995
Which has the largest diameter of the following dry cells?
- A. Type C
- B. Type AA
- C. Type AAA
- D. Type D
56. ECE Board Exam November 1995
_________ is an output applied to Read Only Memory (ROM).
- A. Multiplexer
- B. Address
- C. Input code
- D. Data
57. ECE Board Exam November 1995
________ is a kind of memory where only manufacturer can store program and has a group of memory locations each permanently storing a word.
- A. ROM
- B. SOS memory
- C. RAM
- D. Hard Memory
58. ECE Board Exam November 1995
_________ is an excess property of P-type semiconductor.
- A. Neutron
- B. Proton
- C. Electron
- D. Hole
59. ECE Board Exam November 1995
The best way to control speed of an AC induction motor is by varying the ________
- A. supply frequency
- B. both supply voltage and frequency simultaneously
- C. supply voltage
- D. series resistance of the field
60. ECE Board Exam November 1995
There are _________ identical cells in parallel needed to double the current reading of each cells.
61. ECE Board Exam November 1995
Two heaters A and B are in parallel across supply voltage V. Heater A produces 500 kcal in 20 minutes and B produces 1000 kcal in 10 minutes. The resistance of A is 10 ohms. What is the resistance of B, if the same heaters are connected in series voltage V?
- A. 0.14 ohms
- B. 4.5 ohms
- C. 2.5 ohms
- D. 4.5 ohms
62. ECE Board Exam November 1995
________is a low frequency oscillation which sometimes occurs under fault condition in electron tube circuits.
- A. Ping pong
- B. Jitter
- C. Glitch
- D. Motor boating
63. ECE Board Exam November 1995
The longer the diameter of a wire, the __________ is its resistance.
- A. unstable
- B. higher
- C. stable
- D. lesser
64. ECE Board Exam November 1995
When an atom gains an additional ______, it results to a negative ion.
- A. neutron
- B. proton
- C. electron
- D. atom
65. ECE Board Exam November 1995
_______ refers to circuits with 10 to 100 integrated circuits.
- A. IC
- B. Monolithic
- C. MSI
- D. SSI
66. ECE Board Exam November 1995
What is the most stable type of biasing?
- A. Current feedback
- B. Fixed bias
- C. Voltage divider
- D. Voltage feedback
67. ECE Board Exam November 1995
If the gain of an amplifier without feedback is 10 and with negative feedback is 8, then the feedback fraction is
- A. 0.025
- B. 0.9
- C. 0.8
- D. 0.225
68. ECE Board Exam November 1995
The ________ is an analog component that has two inputs, one inverting and the other non-inverting, and a single output terminal.
- A. counter
- B. op amp
- C. register
- D. flip-flop
69. ECE Board Exam November 1995
What do you call the duration within it takes to read the content of a memory location after it has been addressed
- A. Execution time
- B. Data rate
- C. Cycle time
- D. Access time
70. ECE Board Exam November 1995
What term in electronics is used to express how fast energy is consumed?
- A. Load
- B. Power
- C. Conductance
- D. Volt
71. ECE Board Exam November 1995
If a sine wave voltage varies from 0-200 V, how much is its instant voltage at 90%?
- A. 200 V
- B. Half of its maximum voltage
- C. 100 V
- D. Minimum voltage
72. ECE Board Exam November 1995
Device that increases power content from an input signal.
- A. Attenuator
- B. Amplifier
- C. Oscillator
- D. Transformer
73. ECE Board Exam November 1995
What is the lagging effect between the magnetizing force applied and the flux density?
- A. Hysteresis
- B. Permeance
- C. Reluctance
- D. Eddy Currents
74. ECE Board Exam November 1995
A solid-state device which only gives a “1” output if all its inputs are also “1” is called
- A. an AND gate
- B. a NAND gate
- C. a NOR gate
- D. an OR gate
75. ECE Board Exam November 1995
How much is the resistance of Germanium slag 10 cm long and cross sectional area of 1 squared cm?
- A. 5.5 k ohm
- B. 550 k ohm
- C. 55 k ohm
- D. 550 ohm
76. ECE Board Exam November 1995
A _______ is a device which can test all pins of an IC at the same time.
- A. logic probe
- B. current tracer
- C. logic clip
- D. pulser
77. ECE Board Exam November 1995
Current carried by each of two long parallel conductors is doubled if their separation is also doubled, the force between them would
- A. increase four-fold
- B. become half
- C. increase two-fold
- D. remain the same
78. ECE Board Exam November 1995
What is the first stage in electronic troubleshooting?
- A. Statistical analysis
- B. Symptom analysis
- C. Diagnostics
- D. Initiate plate testing
79. ECE Board Exam November 1995
Circuit that transforms dc from one voltage level to another or from one frequency to another
- A. Coupler
- B. Clipper
- C. Comparator
- D. Converter
80. ECE Board Exam November 1995
______ is an orderly pattern of combined silicon atoms.
- A. Covalent bond
- B. Valence orbit
- C. Semiconductor
- D. Crystal
81. ECE Board Exam November 1995
A crystal with its major flat surfaces cut so that they are perpendicular to a mechanical axis of the original quartz crystal is called
- A. a Y-cut crystal
- B. a Z-cut crystal
- C. an XY-cut crystal
- D. an X-cut crystal
82. ECE Board Exam November 1995
A good material conductor should have _______ valence electrons.
83. ECE Board Exam November 1995
The objective of a capacitor is to
- A. block AC and passes DC current
- B. block DC and passes AC current
- C. stores AC current
- D. blocks AC current
84. ECE Board Exam November 1995
________ is the characteristic of an oscillator that enables it to sustain oscillation after removal of the control stimulus.
- A. Momentum
- B. Fly-wheel effect
- C. Damping
- D. Forced oscillations
85. ECE Board Exam November 1995
__________ is the term used to express the amount of electrical energy in an electrostatic field.
- A. Coulombs
- B. Watts
- C. Volts
- D. Joules
86. ECE Board Exam November 1995
______ is a device that stays on once triggered and stores one of two conditions as a digital circuit.
- A. Gate
- B. Latch
- C. Integrator
- D. Oscillator
87. ECE Board Exam November 1995
When the cells are in series, voltages add, while current capacity is ______.
- A. the same as one cell
- B. zero
- C. infinite
- D. the sum of each cell
88. ECE Board Exam November 1995
In shift registers made up of several flip-flops, the clock signal indicates ________.
- A. a bit of information stored in the flip-flop
- B. information of time
- C. what time is it
- D. when to shift a bit of data from input of the flip-flop to the output
89. ECE Board Exam November 1995
A dc voltage supply is measured at 50 V and drops to 25 V when the load is connected. What is the value of “voltage regulation”?
- A. 5 %
- B. 50 %
- C. 8.33 %
- D. 11.11 %
90. ECE Board Exam November 1995
Which of the following statements is correct?
- A. Transistor has two terminals
- B. Open resistor has small resistance
- C. Typical power rating of a carbon-composition resistor ranged from 0.125 W to 2W
- D. Potentiometer has two terminals
91. ECE Board Exam November 1995
__________ is the major characteristics of an IC
- A. Complication
- B. Size
- C. Power consumption
- D. Speed
92. ECE Board Exam November 1995
Find the sum of binary number 1010 and 0011.
- a) 1021
- b) 1101
- c) 1011
- d) 1111
93. ECE Board Exam November 1995
The loss of electrical energy in counter balancing the residual magnetism in each cycle is called
- A. Eddy current loss
- B. Hysteresis loss
- C. Copper loss
- D. Leakage loss
94. ECE Board Exam November 1995
In order to simplify a circuit, in analysis and computation the diode is normally assumed as _________
- A. zero
- B. ideal
- C. imaginary
- D. infinite
95. ECE Board Exam November 1995
Files in an E-mail communication are send thru _________
- A. disk
- B. mailbox
- C. wires
- D. attachment
96. ECE Board Exam November 1995
An audible tone generated by combining two different frequencies in a non-linear circuit or as sound waves in air is called
- A. side tone
- B. beat tone
- C. heterodyne
- D. deadbeat
97. ECE Board Exam November 1995
__________ are electrons at the outer shell.
- A. Inside shell electrons
- B. Conductor electrons
- C. Outside shell electrons
- D. Valence electrons
98. ECE Board Exam November 1995
Solve for flux density (in gauss) from a magnetic flux of 5,000 Mx through a perpendicular are of 2 cm x 5 cm.
- A. 5000 G
- B. 500 G
- C. 10,000 G
- D. 50 G
99. ECE Board Exam November 1995
Refers to the increased used of data conversion circuits as a result of increased application.
- A. OP AMPS
- B. Linear circuits
- C. Computers
- D. Digital equipment
100. ECE Board Exam November 1995
The decibel gain of cascaded amplifiers equals the
- A. sum of voltage and current gains
- B. product of individual gains
- C. difference of individual gains
- D. sum of individual gains
