Electronic Test 10 Volume 1

1. The voltage across two resistors are equal when they are connected in
A. series
(B) parallel
C.parallel-series
D. series-parallel
2. The currect is zero in all resistors connected in series when one resistor is
A. leaky
B. shorted
(C) opened
D. 0 Ω
3. The physical motion resulting from the forces of magnetic fields is called
(A) motor action
B. Faraday’s law
C. torque
D. Lenz’s law
4. The voltage output of a cell depends on its
A. size
B. construction
C. type
(D) elements
5. What is the most common type of dry cell?
A. Leclanche’s cell
B. Carbon-zinc
C. Lithium cell
(D) Both A and B
6. With the common collector amplifier,
A. the input impedance is low
B. the power gain is always less than 1
C. current gain is always less than 1
(D) voltage gain is always less than 1
7. Superconductivity occurs in certain substances
A. only when they are in liquid state
(B) only at very low temperatures
C. only at very high temperature
D. at all temperatures
8. Of the following quantities, the one that is vector in character is electric
A. energy
B. charge
(C) field
D. current
9. The elcectron in an atom
(A) are some distance away from the nucleus
B. are bound to its permanently
C. have more mass than the nucleus
D. may be positively or negatively charged
10. In a transistor oscillator, ______ is the active device.
A. biasing circuit
(B) transistor
C. LC tank circuit
D. PN junction
11. If the doping level is increased, the breakdown voltage of a zener
(A) is decreased
B. is increased
C. remains the same
D. becomes infinite
12. Which of the following statements is false?
(A) The proton and neutron have the same mass.
B. The electron and proton have different masses.
C. The electrons and protons have charges of the same magnitude but
opposite in sign.
D. Atomic nuclei contain only protons and neutrons.
13. Which of the following is neither a basic physical law or derivable
from one?
A. Coulomb’s law
(B) Ohm’s law
C. Kirchhoff’s first law
D. Kirchhoff’s second law
14. When a pure semiconductor is heated, its resistance
(A) goes down
B. goes up
C. remains the same
D. becomes zero
15. The gain of the amplifier with feedback is known as
A. open loop gain
(B) closed loop gain
C. feedback gain
D. regenerative gain
16. In an ac circuit, the voltage
A. leads the current
B. lags the current
C. is in phase with the current
(D) is any of the above
17. The power dissipated as heat in an ac circuit depends on
(A) resistance
B. inductive reactance
C. capacitive reactance
D. impedance
18. The emf produced in a wire by its motion across a magnetic field
Does not depend on
A. the length of the wire
(B) the diameter of the wire
C. the orientation of the wire
D. the flux density of the field
19. Eddy currents occur only in
A. ferromagnetic materials
(B) conductors
C. insulators
D. coils
20. Lenz’s law is a consequence of the la of conservation of
A. charge
B. field lines
C. momentum
(D) energy
21. All magnetic fields originate in
A. iron atoms
B. permanent magnets
C. magnetic domains
(D) moving electric charges
22. The resistance of a conductor does not depend on its
(A) mass
B. length
C. cross-section area
D. resistivity
23. The ripple will _______ if the filter capacitance is increased.
(A) decrease
B. stay the same
C. increase
D. become zero
24. Self-bias produces
(A) positive feedback
B. negative feedback
C. reverse feedback
D. forward feedback
25. The field effect transistor when compared to bipolar has
much more
A. current
B. voltage gain
(C) input resistance
D. supply voltage
26. Voltage gain is defined as the ratio of output voltage to
(A) input voltage
B. ac emitter resistance
C. ac collector resistance
C. generator voltage
27. What is the error voltage of an ideal op- amplifier?
A. Very small
B. Very large
(C) Zero
D. Equal to input voltage
28. What is the form of the schematic symbol an op-amplifier?
A. A square
B. A circle
(C) A triangle
D. A rectangle
29. Which resistor is good in radio amplifier application?
A. Silver mica
B. Wirewound
C. Tantalum
(D) Carton composition
30. Which does not denote a type a capacitor?
A. Silver-mica
B. Air variable
(C) Ferrite
D. Tantalum

Electronic Test 9 Volume 1

1. The action of a JFET can be compared with that of a
A. pentode
B. tetrode
(C) triode
D. diode
2. What is the equivalent binary of the octal number 673?
A. 101111101
(B) 110111011
C. 110110101
D. 110111111
3. What is the value of the upper resistance limit of a resistor
with color-coding of Brown, Black, Black, Gold?
A. 105 Ω
B. 1.5 Ω
(C) 10.5 Ω
D. 150 Ω
4. How do we obtain the time constant of a series inductor and
resistor circuit?
(A) By dividing the resistance value by the inductance value
B. By multiplying the inductance value by the resistance value
C. by dividing the inductance value by the resistance value
D. By dividing the inductance value by the conductance value
5. How to test whether an oscillator is generating an output?
(A) By checking that the drain current is flowing
B. By checking the value of the signal bias on the gate
C. By checking that the source current is flowing
D. By checking for a high value of the dc supply voltage
6. What is the time constant of a circuit with a charged
capacitor connected across a resistor?
(A) The time required for the capacitor to discharge to a certain
Percentage of its initial voltage
B. Equal to the value of the capacitance divided by the resistance
C. Is the half-life of the capacitor when shunted by the resistor
D. Is equal to the natural period of the circuits’s oscillation
7. How is the frequency of a transistorized multivibrator
determined?
A. By the parameters of the transistor
(B) By the junction capacitance of the transistor
C. By the collector supply voltage
D. By the time constants formed by the coupling capacitors
and the base resistors.
8. When an atom gains an additional electron ______results.
A. positive
(B) negative
C. negative molecule
D. negative neutron
9. Which configuration provides a high degree of isolation between
two stages?
A. Common base
B. Common emitter
C. Common collector
(D) Common grid
10. The impedance of an ac circuits measured in
A. farads
B. henrys
C. siemens
(D) ohms
11. What is the equivalent hexadecimal number of the binary
number 11100101111?
A. 72E
(B) 72F
C. 73F
D. 82E
12. Which electrode of a triode tube can be compared with
the base region of a bipolar transistor?
(A) Control grid
B. Filament
C. Cathode
D. Screen grid
13. Which of the following logic circuits has an operation that
corresponds to two or more switches (or relays) in series?
(A) XOR gate
B. NAND gate
C. AND gate
D. NOR gate
14. Which circuit components has the highest failure rate under normal
Conditions?
A. Transformer
B. Transistor
C. Resistor
(D) Capacitor
15. The inductance of a coil with an air core is directly
proportional to the
A. length of the core
(B) number of turns
C. square of the number of turns
D. cross-sectional area of the wire
16. What is the effect if a bleeder resistor burns out in a power
supply during normal operation?
(A) The diodes could be destroyed
B. The percentage regulation increases significantly.
C. There is no appreciable effect on the output dc voltage.
D. The power transformer will be damaged unless it protected by a fuse.
17. The peak value of a sine wave having an effective value of 20 V is
A. 70.7 V
B. 14.1 V
C. 56.6 V
(D) 28.3 V
18. A varistor is a semiconductor device
A. that can be used to achieve voltage regulation
B. Whose resistance is controlled by the applied voltage
C. that has a high positive temperature coefficient
(D) both A and B correct
19. If a tank ciruit is at the load of a class C amplifier, the
(A) input signal is small
B. efficiency is low
C. output voltage waveform is severely distorted
D. output current waveform is severely distorted
20. The effective values of the source voltage and the source
current are kept constant in an ac circuit. Initially, the current
and voltage are in phase, but as they move out of phase, are
(A) power factor increases
B. apparent power increases
C. true power decreases
D. reactive power decreases
21. What is the total available emf of twelve nickel-cadmium
cells that are connected in series?
A. 12 V
B. 24 V
C. 2.05 V
(D) 15 V
22. What is the resonant frequency of a series RLC circuit consisting of a 6- Ω
resistor, a 5- µH inductor and a 5-pF capacitor?
A. 3.18 MHz
(B) 31.8 MHz
C. 31.8 kHz
D. 318 MHz
23. A “difference of potential ”may also be described as
A. electric power
(B) voltage
C. amperage
D. electron drift
24. A non-conductor is characterized by
A. very few electrons
(B) high energy dissipation
C. a large number of free electrons
D. large amount of skin effect.
25. A wattmeter automatically compensates for
A. power factor
B. overdamping
C. line resistance
(D) power losses
26. RMS is related to peak voltage by the decimal
A. 0.0707
B. 0.636
(C) 0.707
D. 0.770
27. What is the chemical composition of the electrolyte of a
lead-acid storage cell?
A. Sulphur dioxide acid
(B) Sulphuric acid
C. Lead sulphate acid
D. Hydrochloric acid
28. What is usually employed by an RF voltage amplifier
as opposed to an RF power amplifier?
A. Class A bias
(B) Class C bias
C. Cut-off bias
D. Zero bias
29. The transistor common-base amplifier is similar
To what configuration of a vacuum tube?
(A) Grounded-grid amplifier
B. Video amplifier
C. Cathode-follower amplifier
D. Audio amplifier
30. ______ determines the speed of a dc series motor.
A. The brush tension
(B) The field current
C. The load
D. The number of pairs of poles

Electronic Test 8 Volume 1

1. A group of circuits that provides timing and
signals of all operations in the computer.
A. Output unit
(B) Memory unit
C. Control unit
D. Input unit
2. Where does the voltage generated in a DC
generator depend?
(A) Field resistance and flux
B. Field and armature current
C. Flux and speed
D. Speed and field resistance
3. ________ is the most influential factor in the
switching speed of saturated bipolar transistor.
A. Charge storage
B. Collector current
C. HFE
(D) Base current
4. What is a pi-network?
A. A power incidence network.
(B) A network consisting of one inductor and
two capacitors or two inductors and one capacitor.
C. A network consisting entirely of four
inductors or four capacitors.
D. An antenna-matching network that
Isolates it from ground.
5. What is the SI unit of magnetic flux?
(A) Weber
B. Gauss
C. Maxwell
D. Tesla
6. ______ is the type of linear regulator used in
applications requiring efficient utilization of the
primary power source.
A. A series regulator
(B) A shunt regulator
C. A constant current source
D. A shunt current source
7. When a switch is closed, it has a total resistance of
A. 100 Ω at room temperature
B. unstable
(C) infinity
D. Zero
8. How many turns are needed to produce magnetizing
force of 5000 A.T. for coil of 50 amperes?
A. 1,000 turns
B. 5,000 turns
(C) 100 turns
D. 500 turns
9. When an SCR id triggered or in on condition,
its electrical characteristics are similar to what
other solid state device (as measured between its
cathode and anode).
(A) The junction diode
B. The varactor diode
C. The tunnel diode
D. The hot-carrier diode
10. What special type of diode is capable of both amplification
and oscillation?
A. point contact diode
B, Junction diode
(C) Zener diode
D. Tunnel diode
11. A static memory generally contains
(A) row and column decoders
B. no decoders
C. row decoders
D. column decoders
12. What are the majority carrier in an n-type semi-conductor?
(A) Electrons
B. Positive ions
C. Negative ions
D. Holes
13. Steel is hard to magnetize because of its
A. high retentivity
(B) low permeability
C. high permeability
D. high density
14. When you increase the resistance in a circuit,
the flow of electrons will
A. increase
B. be constant
(C) be decreased
D. cease
15. Current in a chemical cell refers to the movement of
A. negative ions only
(B) negative and positive ions
C. positive ions only
D. hole charges
16. What is the effect of light in a photodiode?
(A) Reverse current
B. Limits flow of current
C. Forwards current
D. Renders unstable current
17. What is the effect in terms of bandwidth when the Q
of a signal tuned stage is doubled?
A. Doubled
B. The same
(C) Halved
D. Four times
18. What is the range of voltage rating available in
zener diodes?
A. 2.4 volts to 200 volts
(B) 1.2 volts to 7 volts
C. 3 volts to 3000 volts
D. 1.2 volts of 5.6 volts
19. What type of transformer that is used to protect
technicians and operators from deadly electrical shock?
A. Absorber transformer
(B) Step down transformer
C. Step up transformer
D. Isolation transformer
20. When batteries have cells connected in series, the effect is
A. reduced output voltage
(B) increased current supply
C. increased voltage supply
D. reduced internal resistance
21. A _______ is an instruction in a source language that is to be
replaced by a defined sequence of instruction in the same source
language.
A. statement
B. source code
C. mnemonic
(D) macro-instruction
22. How many op-amps does a window comparator require?
(A) 2
B. 4
C. 3
D. 1
23. What is the memory elements used in clocked sequential
logic circuit?
A. Gate
B. Flip-flop
(C) Static RAM
D. Read-only memory
24. ________for a transistor to be cut off.
A. Maximum current flows from emitter to collector
B. The transistor is at its operating point
C. No current flows from emitter to collector
(D) There is no base current
25. Common base (CB) amplifier has _____ compared to
Common-emitter and common collector amplifiers.
A. a higher input resistance
B. a large current resistance
(C) a lower input resistance
D. a larger voltage gain
26. ______ currents are wasteful currents which flow in cores
of transformers and produce heat.
A. Residual
(B) Eddy
C. Sneak
D. Magnetizing
27. Which of the following is photocell most sensitive to?
(A) Radio waves
B. Sound waves
C. light waves
D. Heat waves
28. What law determines the polarity of an induced voltage?
A. Norton’s law
B. Thevenin’s law
(C) Lenz’s law
D. Faraday’s law
29. What happens in the resistance of copper wire when its
Temperature is raised?
(A) It decreases
B. Unaffected
C. It increases
D. Becomes zero
30. The science of physical phenomenon at very low temperatures,
Approaching absolute zero is called
A. cryptanalysis
B. cybernetics
C. temperature inversion
(D) cryogenics

Electronic Test 7 Volume 1

1. What is the medium of communication with a computer where programs are whitten in mnemonics?
A. High level language
(B). Assembly language
C. Machine language
D. Low-level language
2. The arrow in the symbol of a transistor indicates the direction of
A. electron current in the collector
B. electron current in the emitter
C. donor ion current
(D) hole current in the emitter
3. What is the total resistance of two equal valued resistors in series?
(A) Twice as one
B. The sum of their reciprocals
C. The difference of both
D. The product of both
4.What is the time interval to undertake a refresh operation in typical dynamic RAM?
(A) 200 ns
B. 2 ns
C. 50µs
D. 22µs
5. Electric energy refers to
A. joules divdded by time
(B) volt coulomb
C. volt ampere
D. watt
6. The ideal internal resistance of an ammeter should be
A. equal to the circuit resistance
B. infinity
(C) zero
D. higher than the circuits impedance
7. What type of bias is required for an LED to produce luminescence?
A. Reverse bias
B. Zero bias
(C) Forward bias
D. inductive bias
8. ----------is a layer of an insulating medium that separates plates of a capacitor.
A. Insulation
B. Core
(C) Dielectric
D. Space
9. What is a local oscillator of a radar receiver?
A. Detector
B. Product detector
C. Hartly oscillator
(D) Klystron oscillator
10. What is the equivalent of decimal number 11 in binary
A. 1101
B. 1110
C. 1111
(D) 1011
11. In the concept of induction heating in industrial electronics, the eddy current penetrates to greater depths at
A. high frequencies
(B) increasing induction
C. decreasing induction
D. low frequencies
12. Type of power-line frequency meter composed of vibrating iron reeds placed in alternating magnetic field.
A. Induction type
B. Resonant type
(C) Vibrating reed type
D. Electrodynamic type
13. ____ is called the time sharing of one line with multiplex signal
A. Simultaneous transmission
B. Relay
C. Bi-Directional
(D). Multiplexing
14. A process of constant loss of free electrons and then regaining is called
A. induction
(B) ionization
C. polarization
D. electron gaining
15. The octal equivalent of binary number 10101100 is
A. 367
B. AC16
(C) 254
D. 172
16. Which type of network offers the greater transformation ratio?
A. L-network
(B) Pi-network
C. Constant
D. Constant- M
17 The density of data recorded on magnetic tape is measured in
A. bit stuffing rate
B. bit error
(C) bits per inch
D. bits per second
18. In electricity, positive electric charge refers to
(A) protons
B. neutrons
C. electrons
D. atoms
19 What is the lagging effect between the magnetizing force applied and flux density?
A. Hysteresis
(B) Permeance
C. Eddy current
D. Reluctance
20. What is the equivalent of decimal 15 in octal?
A. 15
B. 18
(C) 17
D. 16
21. How many diodes will you use to have a basic half-wave rectifier?
A. Three
B. Four
(C) Two
D. One
22. Choose the correct answer.
A. A nibble is 4 bits.
B. A byte is 8 bits
C. A bit is one binary digit.
(D) All answers are correct.
23. Component of solar battery which uses light energy to produce electromagnetic force.
A. Alkaline cells
B. Polymer cells
C. Lithuim cells
(D) Selenium cells
24. Kind of AC motor light load high speed or high load speed.
A. Synchronous motor
B. Squirrel-cage motor
C. Split phase motor
(D). Universal motor
25. The most common acid used in lead-acid batteries is
A. nitric acid
B. muric acid
(C) sulfuric acid
D. phosphoric acid
26.What is the smallest element of a matter?
A. Neutron
B. Proton
(C) Atom
D. Electron
27.The ability of a material to conduct magnetic flux through it refers to
A. Permittivity
(B) Permeability
C. Reluctivity
D. Conductivity
28. Part of the oscilloscope which produces bright spot through collection of electrons.
A. Magnetic type
B. Heater cathode
(C) Aquadag coating
D. Grid
29. __________refers to the class of logic circuit containing flip-flops
(A) Combinational
B. Sequential
C. Linear
D. feedback
30. A measuring device of meter made,so the pointer rests at the center of its scale at zero current.
A. linear meter
(B) Galvanometer
C. Digital meter
D. Non-linear meter

Electronic Test 6 Volume 1

1.refers to a form of dc motor-generator with
common field coil for both motor and generator.
A. Motor-generator
(B) Dyna-motor
C. Polyphase motor
D. Synchronous motor
2. Which of the following filters has the most
ripple considering the same secondary
voltage and filter?
(A) Half-wave rectifier
B. Full-wave rectifier
C. Bridge-type rectifier
D. Center-tapped rectifier
3. How do you call an eight element vacuum tube?
A. Pentode
B. Hexode
(C) Octode
D. Septode
4. A. bipolar stage has two unwanted ______ at
high frequencies.
A. capacitance
B lead network
C. inductance
(D) bypass circuits
5. What is the most widely used LC oscillator?
A. Hartley
B. Armstrong
(C) Colpitts
D. clap
6. Find the flux density in Gauss having a flux of
20,000 Mx through a perpendicular area of 2 cm².
A. 20,000 G
(B) 10,000 G
C. 40,000 G
D. 22,000 G
7. A four-layer diode is sometimes called a
(A) pnpn diode
B. switch
C. diac
D. UJT
8. Process by which a magnetic substance
becomes a magnet when it is placed near
a magnet.
A. Electromagnetic induction
B. Magnetic reflection
C. Influx of density
(D) Magnetic induction
9. A bridge rectifier works on how much of the ac cycle?
A. 90º
B. 180º
C. 270º
(D) 360º
10. A series connected coil and capacitor will
present no reactance at
(A) one particular frequency
B. two particular frequencies
C. infinite frequencies
D. any frequency
11. What is the effect of a feedback resistor?
A. It decreases input impedance
(B) It stabilizes voltage gain
C. It increasers distortion
D. It increases collector resistance.
12. _________ is the output of a half-wave rectifier.
(A) Half-wave rectified signal
B. Square wave signal
C. 100% AC signal
D. Sinusoidal signal
13. The term used to describe the process
whereby two transistor with positive
feedback are used to simulate the action of
the thyristor.
A. Arcing
(B) Latching
C. Damping
D. Switching
14. ________is a thin polished slice of a semiconductor
crystal on which integrated circuit can be fabricated often
in duplicate, for cutting into individual dice.
A. Silicon
B. Indium
C. Gallium
(D) Water
15. When a ferromagnetic core is placed inside a
certain coil originally having an air core its
reactance _______ assuming constant frequency.
A. stays the same
B. becomes zero
(C) decreases
16. A conductor behaves as a/an _______ at
absolute zero temperature.
A. semiconductor
B. conductor
(C). super conductor
D. insulator
17. A comparator with a trip point of zero is
sometimes called a
A. threshold detector
B. half-wave detector
(C) positive-limit detector
D. zero-crossing detector
18. What happens to the ac input voltage if the
emitter bypass capacitor is shorted?
(A) Decrease
B. Increase
C. Remains the same
D. Cannot be determined
19. The initial slope of a sine wave increases when
A. slew rate decreases
B. slew rate increases
(C) peak value increases
D. peak value decreases
20. An insulating element or material has the capacity of
A. conducting large current
B. storing high current
C. storing high voltage
(D) preventing short circuit between two
conducting wires.
21. A radio equipment will use 70 % at 50
Amperes rating for 5 hours, howmuch
Capacity of a dry battery is needed?
A. 35
B. 17.5
C. 250
(D) 175
22. One of the following characteristics of a
Resistive material which does not change
Its resistive value respect to time is its
A. fidelity
(B) stability
C. sensitivity
D. selectivity
23. What do you call he oscillator circuit that
Uses a tapped coil in the tuned circuit?
A. Pierce
B. Colpitts
(C) Hartley
D. Armstrong
24. A way of improving the efficiency of an amplifier.
A. Reducing supply voltage
(B) Decreasing unwanted power losses
C. Increasing supply current
D. Reducing load power
25. The Q-point will be located at ______ if the
base resistor is open.
(A) the lower end of the load line
B. the upper end of the load line
C. the middle of the load line
D. the load line
26. Op-amplifier can amplify
A. ac signal only
B. dc signal only
(C) both ac and dc signals
D. neither ac nor dc signals.
27. A frequency multiplier is tuned to
A. a fundamental frequency
(B) a harmonic frequency
C. the ripple frequency
D. a sub-harmonic frequency
28. The anode of a semiconductor diode indicates a _______
change during conduction.
A. positive
B. neutral
(C) negative
D. either or depending on design
29. What is the process used to describe analog-
to-digital conversion?
A. Binarize
B. Linearize
(C) Digitize
D. Analogize
30. The unity-gain frequency equals the product
Of critical frequency and
A. load resistance
(B) mid-band voltage gain
C. tail current
D.compensating capacitance

Electronic Test 5 Volume 1

1 A negatively charged body has
(A) excess of electrons
B. deficit of neutrons
C. excess of neutrons
D. deficit of electrons
2. For a bridge rectifier circuit, the output voltage is a
A. half-wave signal
(B) full-wave signal
C. bridge rectified-signal
D. square wave signal
3. The commutator pitch for a simplex lap winding is equal to
A. the number of poles of the machine
(B) 1
C. pole pairs
D. 2
4. The real working part of d.c machine is the
A commutator
(B) armature winding
C. field winding
D. stator
5. What is the barrier potential across each depletion layer?
A. 0
B. 1 V
C. 0.3 V
(D) 0.7 V
6. The purpose of load in an electric circuit us to
A. increase the circuit current
B. decrease the circuit current
(C). utilize electrical energy
D. minimize wasted energy
7. In order to get good integration, RC product should be at least ___ times than the time period of the input wave.
(A) 10
B. 50
C. 100
D. 1000
8. One would find a clamping circuit in
(A) television receivers
B. radio transmitters
C. receiving antennas
D. radio receivers
9. The most commonly used cell is
A. nickel-cadmium cell
B. nickel- iron cell
(C) lead-acid cell
D. fuel cell
10. The negative resistance characteristic of tetrode is due to
(A) secondary emission
B. plate being positive with respect to cathode
C. control grid being negative with respect to cathode
D. screen grid being negative with respect to cathode
11. A Shockley-diode is the sane as
A. an SCR
B. a triac
C. a diac
(D) a four-layer diode
12. Where does the input current to an inverting voltage amplifier (IVA) flow?
A. Through the load resistor
B. Into the ground
(C) Through the series resistor
D. Into the non-inverting input
13. The unit of transconductance is
A. ohms
(B) mhos
C. henry
D. darafs
14. Which of the following is used by a swamped amplifier?
(A) Negative feedback
B. Positive feedback
C. Regenerative feedback
D. An emitter ground
15. The disadvantage of a mechanical switch is that it
A. is operated mechanically
B. is costly
(C) has high inertia
D. has low inertia
16. The critical frequency of the collector bypass circuit ____ if the collector resistance decreases.
A. cannot be determined
(B) increases
C. decreases
D. stays the same
17. The maximum value of voltage breakdown by the zener mechanism is in the region to
A. 50 to 80 V
B. 100 to 200 V
C. above 200 V
(D) 5 to 8 V
18. The SI unit of reluctance is
A. N/Wb
(B) AT/Wb
C. AT/m
D. AT
19. Parasitic oscillations are unwanted oscillation of
A. magnetic origin
B. low frequency
C. high frequency
(D) very high frequency
20. A vacuum tube is normally operated in the temperature
saturation region to
(A) protect against filament aging
B. keep the tube envelope hot
C. disperse the space charge
D. keep the tube envelope cold
21. In a dc generator, armature reaction ______ pole tip.
A. weakens the flux at the trailing
B. strengthens the flux at the leading
(C) weakens the flux at the leading
D. strengthens the flux at the trailing
22. Dynamic impedance of parallel tuned circuit is
(A) L/CR
B. L/C
C. RL/C
D. R/L
23. Once a thyratron is fired, its control grid _______ over
plate current.
(A) losses all control
B. exercises rough control
C. exercises fine control
D. gains full control
24. Assume the valence electron is removed from copper atom.
The net charge of the atom becomes
A. 0
B. -1
(C) +1
D. +4
25. Negative feedback reduces the
A. feedback fraction
(B) distortion
C. error voltage
D. input offset voltage
26. ________ is a circuit with fixed emitter current.
(A) Emitter bias
B. Base bias
C. Transistor bias
D. Two-supply bias
27. Permanent magnets use _______ as the magnetic material.
A. soft steel
B. iron
C. nickel
(D) hardened steel
28. The control element in an SCR is
A. anode
(B) gate
C. cathode
D. anode supply
29. The Q-point for maximum unclipped output is at
the center of the
A. emitter voltage
B. collector voltage
C. dc load line
(D) ac load line
30. What kind of oscillator is found in an electronic
wristwatch?
A. Hartley
B. Clapp
C. Colpitts
(D) Quartz crystal

Electronic Test 4 Volume 1

1. What substance in its crystalline form is used in oscillators?
A. Silicon
B. Germanium
C. Sapphire
(D) Quarts
2. A decade counter digital IC has how many states?
A. 6
B. 15
(C) 10
D. 20
3. What are the two primary classification of zener diode?
A. Hot carrier and tunnel
B. Varactor and rectifying
C. Forward and reversed biased
(D) Voltage regulator and voltage reference
4. What type of a diode is made of a metal whisker touching a very small
Semiconductor die?
(A) Point contact
B. Zener diode
C. Varactor diode
D. Junction diode
5. A permanent magnet does not exert a force on
A. an unmagnetized iron bar
B. a magnetized iron bar
(C) a stationary electric charge
D. a moving electric charge
6. The transistor common-base amplifier is similar to the vaccum tube
A. cathode-follower amplifier
B. video amplifier
(C) grounded-grip amplifier
D. audio amplifier
7. A safety rule to remember when soldering or desoldering.
A. Make sure the power is disconnected
B. Make sure not to use a soldering iron that emits huge transient voltage
(C) Make sure you use a low wattage soldering iron.
D. None of these.
8. What happens to the conductivity of a semiconductor junction
when it is illuminated?
A. It stays the same.
(B) It increases.
C. It becomes temperature dependent.
D. It decreases.
9. The emf produced in a wire by its motion
Across a magnetic field does not depend on
(A) the diameter of the wire
B. the length of the wire.
C. the orientation of the wire.
D. the flux density of the field.
10. An instrument often used to check the degree
Of motor shaft misalignment is the
A. voltmeter
B. clamp-on ammeter
C. growler
(D) dial indicator
11. The necessary probe commonly used on the oscilloscope when
Measuring high frequency or high impedance circuits is the
A. demodulator probe
(B) low-capacitance probe
C. voltage divider
D. noise probe
12. What are the advantages of using LED?
(A) Low-power consumption and long life
B. High lumens per cm per cm and low-power consumption
C. High lumens per cm per cm low-voltage requirement
D. Current flows when the device is exposed to
a light source.
13. What is the term for an out-of-phase, nonproductive power
associated with inductors and capacitors?
(A) Reactive power
B. Effective power
C. True power
D. Peak envelope power
14. What is a bistable multivibrator circuit?
A. An AND gate
B. An OR gate
C. A clock
(D) A flip-flop
15. The device used to attenuate specific signals is the
A. drop tap
B. line tap off
C. splitter
(D) trap
16. The device that is used to prevent signals from feeding
Back up the transmission line is the
A. trap
(B) terminating resistor
C. line trap
D. preamplifier
17. The meter often used in testing an armature for
short circuit.
A. VOM
B. VTVM
(C) Growler
D. Short circuit meter
18. High or erratic plate grid current readings in an RF
amplifier may be caused by
A. a shifted power supply
(B) parasitic oscillations
C. the used of dynamometers
D. run-down batteries
19. A microprocessor is
A. another name of a computer
B. a name for a calculator chip
(C) a CPU integrated circuit
D. a small scale integrated circuit
20. The device used to pull wire through a conduit
is called
(A) fish tape
B. wire tongs
C. straps
D. connectors
21. Solder is
(A) 40 % lead, 60 % tin
B. 70 % lead, 30 % tin
C. 50 % lead, 50 % tin
D. 60 % lead, 40 % tin
22. Which electrode of a triode tube can be compared
with the collector region of a bipolar transistor?
A. Control grid
B. Cathode
(C) Plate
D. Filament
23. The device used to control a motor from a distance
location is the
(A) magnetic controller
B. manual starter
C. drum switch
D. snap switch
24. Which type of FET has no channel when Vgs = 0 V.
A. MISFET
B. MOSFET depletion type
(C) MOSFET enchancement type
D. VFET
25. A hard tube is defined as a tube with
A. a tungsten filament
B. a metal envelope
C. a gas in the envelope
(D) no gas in the envelope