![Analog Electronics PDF Questions Answers[Top 50]](https://www.jobsjaano.com/wp-content/uploads/2024/02/Analog-Electronics-PDF-Questions-AnswersTop-50.jpg)
Analog Electronics PDF Questions Answers[Top 50]: We are going to cover questions and answers on the same topic.
Analog Electronics Questions and Answers PDF
Question: What is the purpose of a capacitor in an electronic circuit?
a) To amplify signals
b) To store and release electrical energy
c) To control the flow of current
d) To act as a switch
Answer: b) To store and release electrical energy
Question: What is the function of a diode in a circuit?
a) To amplify signals
b) To store electrical energy
c) To control the flow of current in one direction
d) To act as a variable resistor
Answer: c) To control the flow of current in one direction
Question: Which of the following is an example of an operational amplifier (op-amp)?
a) LM317
b) 555 Timer
c) LM741
d) NE555
Answer: c) LM741
Question: In a common-emitter configuration of a bipolar junction transistor (BJT), how is the output phase related to the input phase?
a) 180 degrees out of phase
b) 90 degrees out of phase
c) In phase
d) 360 degrees out of phase
Answer: a) 180 degrees out of phase
Question: What is the purpose of a voltage regulator in a power supply circuit?
a) To amplify signals
b) To maintain a constant output voltage
c) To control the flow of current
d) To store electrical energy
Answer: b) To maintain a constant output voltage
Question: Which component is commonly used to stabilize the biasing in transistor amplifier circuits?
a) Capacitor
b) Resistor
c) Inductor
d) Diode
Answer: b) Resistor
Question: What is the function of a potentiometer in a circuit?
a) To amplify signals
b) To store electrical energy
c) To vary resistance
d) To control current flow
Answer: c) To vary resistance
Question: What does the term “bandwidth” refer to in the context of amplifiers?
a) The range of frequencies over which the amplifier operates effectively
b) The maximum voltage the amplifier can handle
c) The power consumption of the amplifier
d) The resistance of the amplifier circuit
Answer: a) The range of frequencies over which the amplifier operates effectively
Question: What is the purpose of a choke in a power supply filter circuit?
a) To block DC signals
b) To block high-frequency signals
c) To store electrical energy
d) To regulate voltage
Answer: b) To block high-frequency signals
Question: Which type of transistor has higher input impedance?
a) NPN
b) PNP
c) Both have the same input impedance
d) Input impedance depends on the specific transistor model
Answer: c) Both have the same input impedance
Question: What is the primary function of a Schmitt trigger in digital electronics?
a) To amplify signals
b) To provide hysteresis and signal conditioning
c) To store and release electrical energy
d) To generate clock pulses
Answer: b) To provide hysteresis and signal conditioning
Question: Which of the following is a characteristic of an ideal operational amplifier (op-amp)?
a) High input impedance
b) Low output impedance
c) Both a and b
d) Neither a nor b
Answer: c) Both a and b
Question: In a common-collector configuration of a bipolar junction transistor (BJT), how is the output phase related to the input phase?
a) 180 degrees out of phase
b) 90 degrees out of phase
c) In phase
d) 360 degrees out of phase
Answer: c) In phase
Question: What is the primary purpose of a low-pass filter?
a) To allow low-frequency signals to pass through
b) To allow high-frequency signals to pass through
c) To block all frequencies
d) To amplify all frequencies
Answer: a) To allow low-frequency signals to pass through
Question: Which type of feedback increases the stability of an amplifier?
a) Positive feedback
b) Negative feedback
c) No feedback
d) Voltage feedback
Answer: b) Negative feedback
Question: What is the main advantage of using differential amplifiers in signal processing?
a) Higher voltage gain
b) Common-mode rejection
c) Lower power consumption
d) Increased bandwidth
Answer: b) Common-mode rejection
Question: Which parameter determines the cutoff frequency of a low-pass filter?
a) Q factor
b) Resistance
c) Capacitance
d) Inductance
Answer: c) Capacitance
Question: What is the primary purpose of a Zener diode in a circuit?
a) To rectify AC signals
b) To regulate voltage
c) To amplify signals
d) To switch currents
Answer: b) To regulate voltage
Question: In a half-wave rectifier circuit, how many diodes are used?
a) One
b) Two
c) Three
d) Four
Answer: a) One
Question: What is the primary purpose of a phase-locked loop (PLL) in communication systems?
a) To amplify signals
b) To synchronize frequencies
c) To filter noise
d) To regulate voltage
Answer: b) To synchronize frequencies
Question: What is the function of a comparator in electronic circuits?
a) To amplify signals
b) To compare two input voltages and produce a digital output
c) To store electrical energy
d) To regulate current
Answer: b) To compare two input voltages and produce a digital output
Question: What is the purpose of a flyback diode in a relay circuit?
a) To amplify signals
b) To protect the relay coil from voltage spikes when turned off
c) To store electrical energy
d) To control the relay’s switching time
Answer: b) To protect the relay coil from voltage spikes when turned off
Question: In an RC circuit, what happens to the time constant if the resistance is increased?
a) Time constant increases
b) Time constant decreases
c) Time constant remains the same
d) Time constant becomes zero
Answer: a) Time constant increases
Question: Which of the following is a common application of a Wien Bridge oscillator?
a) Power amplification
b) Frequency synthesis
c) Phase modulation
d) Voltage regulation
Answer: b) Frequency synthesis
Question: What is the primary purpose of a varactor diode in electronic circuits?
a) To amplify signals
b) To provide hysteresis
c) To store electrical energy
d) To act as a voltage-controlled capacitor
Answer: d) To act as a voltage-controlled capacitor
Question: In a class AB amplifier, what is the key feature that combines characteristics of class A and class B amplifiers?
a) High efficiency
b) Low distortion
c) Low power consumption
d) Both a and b
Answer: d) Both a and b
Question: What is the primary purpose of a decoupling capacitor in a power supply circuit?
a) To amplify signals
b) To filter out high-frequency noise
c) To store electrical energy
d) To regulate voltage
Answer: b) To filter out high-frequency noise
Question: Which type of filter is commonly used to separate different frequency components in a signal?
a) Band-pass filter
b) Low-pass filter
c) High-pass filter
d) Notch filter
Answer: a) Band-pass filter
Question: In a tuned circuit, what is the resonance frequency?
a) The frequency at which the circuit blocks all signals
b) The frequency at which the circuit is most sensitive
c) The frequency at which the circuit resonates and exhibits maximum impedance
d) The frequency at which the circuit allows all signals to pass through
Answer: c) The frequency at which the circuit resonates and exhibits maximum impedance
Question: Which characteristic differentiates an enhancement-mode MOSFET from a depletion-mode MOSFET?
a) Threshold voltage
b) Drain-source voltage
c) Channel resistance
d) Gate capacitance
Answer: a) Threshold voltage
Question: What is the primary function of a Hall-effect sensor?
a) To amplify signals
b) To measure magnetic fields
c) To store electrical energy
d) To control the flow of current
Answer: b) To measure magnetic fields
Question: In a transformer, which coil is connected to the input voltage source?
a) Primary coil
b) Secondary coil
c) Tertiary coil
d) Inductive coil
Answer: a) Primary coil
Question: What is the primary purpose of a Darlington pair configuration in transistor circuits?
a) To amplify signals with high gain
b) To provide voltage regulation
c) To act as a rectifier
d) To store electrical energy
Answer: a) To amplify signals with high gain
Question: In frequency modulation (FM), what does the modulation index represent?
a) Peak amplitude of the modulating signal
b) Frequency deviation from the carrier frequency
c) Phase shift of the modulating signal
d) Signal-to-noise ratio
Answer: b) Frequency deviation from the carrier frequency
Question: What is the purpose of a crystal oscillator in electronic circuits?
a) To amplify signals
b) To provide hysteresis
c) To generate a stable and precise frequency
d) To control the flow of current
Answer: c) To generate a stable and precise frequency
Question: Which type of amplifier configuration has the highest input impedance?
a) Common-emitter
b) Common-base
c) Common-collector
d) Darlington pair
Answer: b) Common-base
Question: What is the primary function of a voltage divider?
a) To amplify signals
b) To store electrical energy
c) To regulate voltage
d) To divide a voltage into smaller values
Answer: d) To divide a voltage into smaller values
Question: Which type of filter is designed to allow only a specific frequency to pass through?
a) Band-stop filter
b) High-pass filter
c) Low-pass filter
d) Notch filter
Answer: d) Notch filter
Question: What is the purpose of a differentiator circuit?
a) To amplify signals
b) To integrate signals
c) To differentiate signals with respect to time
d) To store electrical energy
Answer: c) To differentiate signals with respect to time
Question: In a bipolar junction transistor (BJT), what is the role of the emitter?
a) To control the base current
b) To provide mechanical support
c) To collect the majority charge carriers
d) To amplify the input signal
Answer: c) To collect the majority charge carriers
Question: What is the primary purpose of a light-emitting diode (LED) in electronic circuits?
a) To amplify signals
b) To store electrical energy
c) To generate light when forward-biased
d) To regulate voltage
Answer: c) To generate light when forward-biased
Question: In a Wien Bridge oscillator, what component is typically adjusted to tune the oscillation frequency?
a) Inductor
b) Capacitor
c) Resistor
d) Diode
Answer: b) Capacitor
Question: Which of the following is a characteristic of a class D amplifier?
a) High efficiency
b) Linear operation
c) Low distortion
d) Low power consumption
Answer: a) High efficiency
Question: What is the primary purpose of a phase-locked loop (PLL) in communication systems?
a) To amplify signals
b) To synchronize frequencies
c) To filter noise
d) To regulate voltage
Answer: b) To synchronize frequencies
Question: In an AC circuit, what is the phase relationship between current and voltage in a pure inductor?
a) Current leads voltage by 90 degrees
b) Current lags voltage by 90 degrees
c) Current is in phase with voltage
d) Current and voltage are 180 degrees out of phase
Answer: b) Current lags voltage by 90 degrees
Question: What is the primary purpose of a sample-and-hold circuit?
a) To amplify signals
b) To store electrical energy
c) To sample an input signal and hold its value for a short duration
d) To regulate voltage
Answer: c) To sample an input signal and hold its value for a short duration
Question: In a tuned amplifier, what is the role of the resonant circuit?
a) To amplify signals with a flat frequency response
b) To filter out unwanted frequencies
c) To resonate at a specific frequency and enhance amplification
d) To regulate voltage
Answer: c) To resonate at a specific frequency and enhance amplification
Question: Which type of filter is commonly used to attenuate a specific frequency band?
a) Band-pass filter
b) Low-pass filter
c) Band-stop filter
d) High-pass filter
Answer: c) Band-stop filter
Question: What is the primary function of a voltage follower (buffer) circuit?
a) To amplify signals
b) To store electrical energy
c) To provide isolation between circuits
d) To replicate a voltage without loading the source
Answer: d) To replicate a voltage without loading the source
Question: In a push-pull amplifier, what is the purpose of the two active devices (transistors or tubes)?
a) To amplify signals with high gain
b) To provide redundancy
c) To increase power efficiency
d) To regulate voltage
Answer: c) To increase power efficiency
Question: What is the primary purpose of a current mirror circuit?
a) To amplify signals
b) To replicate a reference current
c) To store electrical energy
d) To regulate voltage
Answer: b) To replicate a reference current
Question: In a negative feedback amplifier, what effect does it have on the gain and stability?
a) Increases gain, decreases stability
b) Decreases gain, increases stability
c) Increases gain, increases stability
d) Decreases gain, decreases stability
Answer: b) Decreases gain, increases stability
Question: What is the purpose of a differentially balanced amplifier?
a) To amplify signals with high gain
b) To provide balanced output signals
c) To store electrical energy
d) To regulate voltage
Answer: b) To provide balanced output signals
Question: In a relaxation oscillator circuit, what component determines the frequency of oscillation?
a) Resistor
b) Capacitor
c) Inductor
d) Diode
Answer: b) Capacitor
Question: What is the primary purpose of a band-pass filter?
a) To allow only low-frequency signals to pass through
b) To allow a specific range of frequencies to pass through
c) To block all frequencies
d) To amplify all frequencies
Answer: b) To allow a specific range of frequencies to pass through
Question: Which type of modulation is commonly used in AM (Amplitude Modulation) broadcasting?
a) Frequency Modulation (FM)
b) Phase Modulation (PM)
c) Amplitude Modulation (AM)
d) Pulse Width Modulation (PWM)
Answer: c) Amplitude Modulation (AM)
Question: What is the primary function of a transformer in a power supply circuit?
a) To amplify signals
b) To store electrical energy
c) To regulate voltage
d) To transfer electrical energy between circuits
Answer: d) To transfer electrical energy between circuits
Question: What is the purpose of a shunt resistor in an ammeter?
a) To amplify signals
b) To measure voltage
c) To provide a current path for measurement
d) To store electrical energy
Answer: c) To provide a current path for measurement
Question: What is the primary role of a mixer in communication systems?
a) To amplify signals
b) To combine signals of different frequencies
c) To filter noise
d) To regulate voltage
Answer: b) To combine signals of different frequencies
Question: What does the term “common-mode rejection ratio (CMRR)” refer to in amplifier circuits?
a) The ability of the amplifier to reject common-mode signals
b) The gain of the amplifier for common-mode signals
c) The phase shift of the amplifier for common-mode signals
d) The bandwidth of the amplifier for common-mode signals
Answer: a) The ability of the amplifier to reject common-mode signals
Question: What is the primary purpose of a varistor in an electronic circuit?
a) To amplify signals
b) To store electrical energy
c) To provide variable resistance
d) To protect against voltage surges
Answer: d) To protect against voltage surges
Question: In a full-wave rectifier circuit, how many diodes are typically used?
a) One
b) Two
c) Three
d) Four
Answer: b) Two
Question: What is the primary role of a voltage-controlled oscillator (VCO) in electronic systems?
a) To amplify signals
b) To generate a variable-frequency output
c) To store electrical energy
d) To regulate voltage
Answer: b) To generate a variable-frequency output
Question: Which semiconductor device is commonly used for signal amplification in high-frequency applications?
a) Bipolar Junction Transistor (BJT)
b) Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET)
c) Junction Field-Effect Transistor (JFET)
d) Schottky Diode
Answer: b) Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET)
Question: What is the primary purpose of a phase-locked loop (PLL) in communication systems?
a) To amplify signals
b) To synchronize frequencies
c) To filter noise
d) To regulate voltage
Answer: b) To synchronize frequencies
Question: In an RC integrator circuit, what happens to the time constant if the resistance is increased?
a) Time constant increases
b) Time constant decreases
c) Time constant remains the same
d) Time constant becomes zero
Answer: b) Time constant decreases
Question: Which type of modulation is commonly used in FM (Frequency Modulation) broadcasting?
a) Frequency Modulation (FM)
b) Amplitude Modulation (AM)
c) Phase Modulation (PM)
d) Pulse Width Modulation (PWM)
Answer: a) Frequency Modulation (FM)
Question: What is the purpose of a flyback transformer in a switching power supply?
a) To amplify signals
b) To store electrical energy
c) To provide isolation between circuits
d) To control the switching of the power supply
Answer: d) To control the switching of the power supply
Question: Which of the following is a characteristic of a tunnel diode?
a) High resistance
b) Negative resistance
c) Low breakdown voltage
d) Low capacitance
Answer: b) Negative resistance
Question: In an AC circuit, what is the phase relationship between current and voltage in a pure capacitor?
a) Current leads voltage by 90 degrees
b) Current lags voltage by 90 degrees
c) Current is in phase with voltage
d) Current and voltage are 180 degrees out of phase
Answer: b) Current lags voltage by 90 degrees
Question: What is the primary purpose of a tunnel diode in electronic circuits?
a) To amplify signals
b) To store electrical energy
c) To generate light
d) To exhibit negative resistance
Answer: d) To exhibit negative resistance
Question: What is the primary function of a thermistor in a circuit?
a) To amplify signals
b) To store electrical energy
c) To regulate temperature-dependent resistance
d) To act as a voltage-controlled capacitor
Answer: c) To regulate temperature-dependent resistance
Question: Which type of filter is commonly used in audio applications to separate bass and treble frequencies?
a) Band-pass filter
b) Low-pass filter
c) High-pass filter
d) Notch filter
Answer: b) Low-pass filter
Question: What is the primary purpose of an operational transconductance amplifier (OTA) in electronic circuits?
a) To amplify signals
b) To provide variable resistance
c) To generate oscillations
d) To convert voltage to current
Answer: d) To convert voltage to current
Question: Which component is commonly used in voltage regulation circuits to maintain a constant output voltage despite input variations?
a) Zener diode
b) Light-emitting diode (LED)
c) Phototransistor
d) Varistor
Answer: a) Zener diode
Question: In a multivibrator circuit, what is the purpose of coupling capacitors?
a) To block DC signals
b) To control the flow of current
c) To provide energy storage
d) To amplify signals
Answer: a) To block DC signals
Question: What is the primary purpose of a Schmidt trigger in digital electronics?
a) To amplify signals
b) To provide hysteresis and signal conditioning
c) To store electrical energy
d) To regulate voltage
Answer: b) To provide hysteresis and signal conditioning
Question: Which of the following is a characteristic of an ideal voltage source?
a) Zero internal resistance
b) Infinite internal resistance
c) Constant voltage output under all conditions
d) Variable voltage output based on load
Answer: c) Constant voltage output under all conditions
Question: What is the purpose of a potentiometer in a voltage divider circuit?
a) To amplify signals
b) To store electrical energy
c) To provide a variable voltage reference
d) To regulate current
Answer: c) To provide a variable voltage reference
Question: Which type of modulation is commonly used in PM (Phase Modulation) broadcasting?
a) Amplitude Modulation (AM)
b) Frequency Modulation (FM)
c) Phase Modulation (PM)
d) Pulse Width Modulation (PWM)
Answer: c) Phase Modulation (PM)
Related Queries: