Course Introduction
Electronic Circuits
Test Questions
Electronic Circuits introduces students to the foundational principles and practical applications of analog and digital electronic circuits. The course covers topics such as circuit analysis, semiconductor devices (including diodes and transistors), operational amplifiers, filters, oscillators, and basic logic circuits. Through theoretical study and hands-on laboratory experiments, students will learn to design, simulate, build, and troubleshoot a variety of electronic circuits, preparing them for advanced coursework and real-world engineering challenges in electronics.
Recommended Textbook
Electronic Principles 8th Edition by Albert Paul Malvino Dr
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Page 2
Chapter 1: Introduction
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Q1) A derivation is a formula produced without the use of mathematics.
A)True
B)False
Answer: False
Q2) When analyzing a transistor circuit,the transistor is visualized as a A) load resistor.
B) voltage source.
C) current source.
D) voltmeter.
Answer: C
Q3) A dc voltage source produces a constant load voltage
A) for different load resistances.
B) for equal load resistances only.
C) with zero load resistance.
D) by using alternating current.
Answer: A
Q4) The second approximation of a dc voltage source includes internal resistance.
A)True
B)False
Answer: True
Page 3
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Chapter 2: Semoconductors
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Q1) A doped semiconductor is called an intrinsic semiconductor.
A)True
B)False
Answer: False
Q2) A trivalent atom is also called
A) an acceptor atom.
B) a donor atom.
C) copper.
D) a negative ion.
Answer: A
Q3) Reverse bias is achieved when the negative source terminal is connected to the n-type material,and the positive terminal is connected to the p-type material.
A)True
B)False
Answer: False
Q4) Copper is a good conductor.
A)True
B)False
Answer: False
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Chapter 3: Diode Theory Key
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Q1) What is the condition that causes a diode togo into avalanche when a huge number of carriers suddenly appear in the depletion layer?
A) forward voltage drop
B) maximum power dissipation
C) reverse breakdown voltage
D) maximum forward current
Answer: C
Q2) An ordinary resistor is a linear device because the graph of its current versus voltage is a straight line.
A)True
B)False
Answer: True
Q3) The two most popular basic styles of surface-mount packages are surface mount and
A) small outline transistor.
B) large outline transistor.
C) surface outline diode.
D) surface outline transistor.
Answer: A
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Page 5
Chapter 4: Diode Circuits
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Q1) What type of filters are configured using resistors,inductors,and capacitors connected between the rectifier and the load resistance?
A) active
B) passive
C) operational amplifier
D) IC
Q2) Commercial transformers are not ideal because they produce
A) alternating current.
B) filtered dc.
C) power losses.
D) power gains.
Q3) By using rectifier diodes and operating at 60 Hz,what type of power supply can be configured?
A) IC
B) voltage doubler
C) passive
D) clipper
Q4) With a half-wave rectifier,the output frequency equals the input frequency.
A)True
B)False
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Chapter 5: Special-Purpose Diodes Key
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Q1) Step-recovery diodes are useful in frequency multiplier circuits.
A)True
B)False
Q2) The combination of an LED and a photodiode is called a(n)
A) seven-segment display.
B) laser.
C) LCD.
D) optocoupler.
Q3) What type of cable is comprised of thin flexible fibers of glass or plastic that transmit light beams instead of free electrons?
A) coaxial
B) stranded copper cable
C) fiber-optic
D) wave guide
Q4) The positive resistance of tunnel diodes is useful in oscillator circuits.
A)True
B)False
Q5) An optoisolator combines an LED and a photodiode is a single package.
A)True
B)False
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Chapter 6: BJT Fumdamentals
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Q1) Data sheet entries that allow a designer to work out the case temperature for different heat sinks are called ________.
A) thermal resistances
B) thermal shocks
C) reverse breakdown resistances
D) negative resistances
Q2) Generally,power transistors can dissipate
A) less than 1 W.
B) more than 1 W.
C) more than 100 W.
D) less than 1 mW.
Q3) On the set of collector curves,the horizontal part of the curve where the collector current is constant,is known as the
A) active region.
B) breakdown region.
C) saturation region.
D) cut-off region.
Q4) An unbiased transistor is like two back-to-back diodes.
A)True
B)False
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Chapter 7: BJT Biasing
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Q1) With the values shown at the operating point labeled Q,the voltage across R<sub>C</sub> would be 10 V.
A)True
B)False
Q2) Emitter-feedback bias is also called self-bias.
A)True
B)False
Q3) The schematic diagram of a pnp transistor shows
A) the emitter as an arrow pointing in.
B) the emitter as an arrow pointing out.
C) the collector as an arrow pointing in.
D) the collector as an arrow pointing out.
Q4) To prevent meter loading,a voltmeter used to make transistor circuit voltage measurements should have an input impedance of ________.
A) 10 kW
B) 100 kW
C) 1 MW
D) 10 MW
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Chapter 7: Basic BJT Amplifiers
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Q1) The ac base-emitter voltage divided by the ac emitter current equals
A) ac resistance.
B) dc resistance.
C) reactance.
D) impedance.
Q2) The voltage gain of an amplifier is defined as the ac output voltage divided by the ac input voltage.
A)True
B)False
Q3) The unbypassed emitter resistance is called a feedback resistor because it has an ac voltage across it that opposes changes in voltage gain.
A)True
B)False
Q4) It is standard practice to use capital letters and subscripts for dc quantities.
A)True
B)False
Q5) Coupling capacitors can be approximated as dc shorts.
A)True
B)False
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Chapter 9: Multistage,CC,and CB Amplifiers
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Q1) The amplifier configuration in which the input signal drives the emitter and the output signal is taken from the collector is the
A) common collector.
B) common emitter.
C) common base.
D) emitter follower.
Q2) A Darlington connection comprised of npn and pnp transistors is called a A) stationary Darlington.
B) Duo-Darlington.
C) supplementary Darlington.
D) complementary Darlington.
Q3) Voltage gain can be increased by using a multistage amplifier.
A)True
B)False
Q4) The emitter-follower amplifier has a
A) low input impedance and low distortion.
B) high input impedance and high distortion.
C) high input impedance and low distortion.
D) low input impedance and high distortion.
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Chapter 10: Power Amplifiers
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Q1) What factor places a limit on the allowable power dissipation of a transistor?
A) power supply
B) transistor case style
C) emitter-base junction
D) temperature at the collector junction
Q2) When the ac load impedance of a tank circuit is maximum and purely resistive
A) the circuit is off resonance.
B) the circuit is resonant.
C) the circuit is inductive.
D) the circuit is capacitive.
Q3) In a well-designed large-signal amplifier,we get a maximum peak-to-peak unclipped output which is referred to as
A) ac output compliance.
B) dc output compliance.
C) peak compliance.
D) complementary compliance.
Q4) With a class A amplifier,collector current flows throughout the cycle.
A)True
B)False
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Chapter 11: JFETS
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Q1) What is the equivalent and modern unit for mho?
A) ohm
B) farad
C) siemen
D) henry
Q2) When the JFET operates in only the ohmic region or in the cutoff region,it is being used as
A) an analog switch.
B) a linear amplifier.
C) an oscillator.
D) a regulator.
Q3) A JFET circuit that converts a dc input voltage to a square-wave output is
A) a regulator.
B) a chopper.
C) an inverter.
D) a rectifier.
Q4) A JFET chopper can be used to build a dc amplifier.
A)True
B)False
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Chapter 12: Mosfets
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Q1) Data is a term that refers to numbers,text,graphics,and all other information that can be coded as binary numbers.
A)True
B)False
Q2) A power FET that operates as a device B and allows device A to communicate with or control device C is called
A) a connector.
B) an interface.
C) a coupler.
D) a transceiver.
Q3) The depletion-mode MOSFET or D-MOSFET is a normally off device.
A)True
B)False
Q4) The minimum gate to source voltage that causes current to flow from source to drain is called the saturation voltage.
A)True
B)False
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Chapter 13: Thyristors
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Q1) The IGBT is a
A) normally off high input impedance device.
B) normally off low input impedance device.
C) normally on high input impedance device.
D) normally on low input impedance device.
Q2) The triac can control current
A) in both directions.
B) in only one direction.
C) only if the gate voltage is negative.
D) only if it is dC.
Q3) A silicon unilateral switch (SUS)is another name for the Schockley diode.
A)True
B)False
Q4) What device is replacing UJTs and PUTs in many of their applications?
A) IGBT
B) power amp
C) MOSFET
D) op amp
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Chapter 14: Frequency Effects
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Q1) The total decibel voltage gain of two cascaded stages equals the sum of the individual decibel voltage gains.
A)True
B)False
Q2) A graph of decibel voltage gain versus frequency as it would appear on semilogarithmic paper is called
A) a frequency response.
B) Fourier's analysis.
C) a Bode plot.
D) a Miller plot.
Q3) What type of circuit rolls off voltage gain and prevents an op amp from oscillating?
A) attenuator
B) RC lead
C) RC lag
D) LC lag
Q4) A designer can use direct coupling between amplifier stages in order to amplify down to zero hertz.
A)True
B)False
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Chapter 15: Differential Amplifiers
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Q1) When a diff amp is amplifying the wanted signal and discriminating against the common-mode signal the CMRR is
A) high.
B) low.
C) less than 1.
D) equal to the common-mode voltage gain divided by the voltage gain.
Q2) Components that are easily fabricated on a chip do not include ________.
A) transistors
B) capacitors
C) diodes
D) resistors
Q3) With diff amp configurations,when a single-ended output is used,the input may be noninverting or inverting.
A)True
B)False
Q4) In order to get single-ended input operation using a diff amp,one of the inputs is used and the other input is grounded.
A)True
B)False
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Chapter 16: Operational Amplifiers
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Q1) When higher input resistance is required,a designer would most probably use a BIFET op amp.
A)True
B)False
Q2) The best method to eliminate output error and minimize thermal drift of an op amp is by
A) connecting a compensating capacitor.
B) using a nulling circuit.
C) using a tuned amplifier.
D) using a RLC filter.
Q3) The ideal op amp has infinite voltage gain,infinite unity-gain frequency,infinite input impedance,and infinite CMRR.
A)True
B)False
Q4) Most op amps available today are low-power devices with a maximum power rating of less than a watt.
A)True
B)False
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Page 18
Chapter 17: Negative Feedback
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Q1) The effects of negative feedback does not include
A) stabilize voltage gain.
B) increase input impedance.
C) increase output impedance.
D) decrease output impedance.
Q2) Op amps generally have a much higher value of common-mode input resistance than do discrete bipolar diff amps because
A) a current mirror is used.
B) an emitter resistor is used.
C) a compensating capacitor is used.
D) regenerative feedback is used.
Q3) If an op amp does not have enough gain-bandwidth product for an application,a designer can
A) use a different application.
B) add discrete amplifiers.
C) select a better op amp.
D) use discrete amplifiers instead.
Q4) Loop gain is the op amp's voltage gain of the forward and feedback paths. A)True
B)False
Page 19
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Chapter 18: Linear OP AMP Circuits
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Q1) Burning off resistor areas on a semiconductor chip with a laser in order to get an extremely precise value of resistance is referred to as
A) laser trimming.
B) resistor chipping.
C) buffering.
D) guard driving.
Q2) One of the most important characteristics of a differential amplifier is its CMRR.
A)True
B)False
Q3) The total voltage gain with an input driving both sides of an op amp equals the voltage gain of the inverting channel times the voltage gain of the noninverting channel.
A)True
B)False
Q4) Linear op amp circuits do not include
A) differential amps.
B) instrumentation amps.
C) multiplexers.
D) current boosters.
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Chapter 19: Active Filters Key
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Q1) With a constant input voltage,attenuation is the output voltage at any frequency divided by the output voltage in the midband.
A)True
B)False
Q2) A high-order active filter can be built by cascading second-order stages whose resonant frequencies and Qs are staggered in precisely the right way to get the desired overall response.
A)True
B)False
Q3) The highest frequency in the passband of a low-pass filter is called the
A) optimal frequency.
B) resonant frequency.
C) cutoff frequency.
D) pole frequency.
Q4) A method used to correct for limited GBW is ________.
A) attenuation
B) damping
C) predistortion
D) multiple-feedback
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Chapter 20: Nonlinear Op-Amp Circuit Applications Key
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Q1) Hysteresis is desirable in a Schmitt trigger because it prevents noise from causing false triggering.
A)True
B)False
Q2) Thermal noise is caused by speaker wires located in an environment with a high ambient temperature.
A)True
B)False
Q3) A comparator has two input voltages and one output voltage which is either a low or a high voltage.
A)True
B)False
Q4) A double-ended limit detector detects when the input voltage is between two limits called the window.
A)True B)False
Q5) The trip point of a comparator is located in the center of the linear region. A)True B)False
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Chapter 21: Oscillators Key
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Q1) Some phase-shift oscillator configurations use
A) one lead circuit to produce the required 180° of phase shift.
B) two lead circuits to produce the required 180° of phase shift.
C) four lead circuits to produce the required 180° of phase shift.
D) six lead circuits to produce the required 180° of phase shift.
Q2) PWM allows a low-frequency modulating signal to change the pulse width of a high-frequency signal called the
A) carrier
B) modulating signal
C) pulse-width signal
D) FM
Q3) The frequency where the output of a lead-lag circuit is maximum is called the resonant frequency.
A)True
B)False
Q4) An IC function generator cannot perform as which of the following?
A) voltage-to-frequency conversion
B) digital-to-analog conversion
C) voltage-controlled oscillator
D) frequency-shift keying
23
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Chapter 22: Regulated Power Supplies Key
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Q1) Dc-to dc converters have efficiencies that range from
A) 10 to 25 percent.
B) 30 to 40 percent.
C) 45 to 60 percent.
D) 65 to 85 percent.
Q2) Since the ripple rejection of an IC voltage regulator is high
A) only LC filters are needed.
B) LC filters are not needed.
C) regulation is reduced.
D) output voltage is minimum.
Q3) A switching regulator can hold the output voltage constant under varying line and load conditions by
A) using a twin-T filter.
B) changing the duty cycle.
C) using a crow-bar circuit.
D) using direct coupling.
Q4) The transistor of a series regulator is called a pass transistor because the entire load current passes through it.
A)True
B)False
Page 24
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