Analog Electronics MCQs

What is the unit of electrical resistance? a) Ohm b) Volt c) Ampere d) Watt Answer: a) Ohm Which of the following devices is used to measure electric current? a) Voltmeter b) Ammeter c) Ohmmeter d) Wattmeter Answer: b) Ammeter What is the SI unit of capacitance? a) Ohm b) Farad c) Henry d) Tesla Answer: b) Farad Which electronic component can store electrical charge? a) Resistor b) Capacitor c) Inductor d) Diode Answer: b) Capacitor In an AC circuit, what is the phase relationship between voltage and current in a pure inductor? a) Voltage leads current by 90 degrees b) Voltage lags current by 90 degrees c) Voltage and current are in phase d) Voltage and current are 180 degrees out of phase Answer: b) Voltage lags current by 90 degrees What is the function of a diode in an electronic circuit? a) Amplification b) Signal modulation c) Rectification d) Oscillation Answer: c) Rectification Which material is commonly used in the construction of a P-N junction diode? a) Copper b) Silicon c) Aluminum d) Zinc Answer: b) Silicon Which of the following is a passive component? a) Transistor b) Op-amp c) Capacitor d) Logic gate Answer: c) Capacitor What is the primary function of an op-amp (operational amplifier)? a) Voltage amplification b) Current amplification c) Signal modulation d) Frequency conversion Answer: a) Voltage amplification What is the relationship between the base, emitter, and collector in a bipolar junction transistor (BJT)? a) Base is common to both emitter and collector b) Emitter is common to both base and collector c) Collector is common to both base and emitter d) None of the above Answer: c) Collector is common to both base and emitter Which type of biasing allows a transistor to operate in the active region? a) Forward bias b) Reverse bias c) Base bias d) Collector bias Answer: c) Base bias What is the primary function of a voltage regulator? a) To amplify voltage b) To stabilize voltage c) To modulate voltage d) To convert AC to DC voltage Answer: b) To stabilize voltage Which of the following is a characteristic of an ideal op-amp? a) Infinite input impedance b) Infinite gain c) Zero output impedance d) All of the above Answer: d) All of the above What does RMS stand for in the context of AC voltage? a) Root Mean Square b) Rapid Modulation System c) Resonant Magnetic System d) Real-time Measurement System Answer: a) Root Mean Square Which of the following is true for a parallel RC circuit at resonance? a) The impedance is maximum b) The impedance is minimum c) The current is maximum d) The current is minimum Answer: c) The current is maximum What is the primary purpose of a flyback diode in a circuit? a) To regulate voltage b) To prevent voltage spikes c) To amplify signals d) To modulate frequency Answer: b) To prevent voltage spikes Which of the following describes a common-emitter configuration of a transistor? a) High input impedance, low output impedance b) Low input impedance, high output impedance c) High input and output impedance d) Low input and output impedance Answer: b) Low input impedance, high output impedance In which region does a zener diode operate when it is not conducting? a) Forward bias b) Reverse bias c) Cut-off region d) Saturation region Answer: b) Reverse bias Which of the following is an advantage of a differential amplifier? a) High gain b) Low input impedance c) High output impedance d) Narrow bandwidth Answer: a) High gain What is the purpose of a transistor in an amplifier circuit? a) To modulate frequency b) To rectify signals c) To amplify signals d) To stabilize voltage Answer: c) To amplify signals Which of the following is a passive filter? a) Capacitor-filter b) Op-amp filter c) Active filter d) Inductor-filter Answer: d) Inductor-filter What does the term ‘bandwidth’ refer to in the context of electronic circuits? a) Range of frequencies over which a circuit operates effectively b) Voltage range of an op-amp c) Current range of a diode d) Maximum power handling capacity of a transistor Answer: a) Range of frequencies over which a circuit operates effectively What is the function of a bypass capacitor in a power supply circuit? a) To block DC voltage b) To stabilize AC voltage c) To filter out noise d) To regulate current Answer: c) To filter out noise Which of the following is true for an ideal diode? a) Zero forward voltage drop b) Infinite reverse voltage capability c) Conducts current in both directions d) All of the above Answer: a) Zero forward voltage drop What is the purpose of negative feedback in an amplifier circuit? a) To increase gain b) To decrease bandwidth c) To stabilize gain and reduce distortion d) To modulate frequency Answer: c) To stabilize gain and reduce distortion Which of the following is a characteristic of an inductor? a) It stores energy in a magnetic field b) It stores energy in an electric field c) It amplifies signals d) It rectifies signals Answer: a) It stores energy in a magnetic field What is the function of a choke coil in an electrical circuit? a) To provide resistance b) To store energy c) To block AC while allowing DC to pass d) To modulate frequency Answer: c) To block AC while allowing DC to pass Which of the following is true for a series RC circuit at resonance? a) The impedance is maximum b) The impedance is minimum c) The current is maximum d) The current is minimum Answer: d) The current is minimum What is the primary function of a transformer in an electrical circuit? a) To amplify signals b) To convert AC to DC c) To step up or step down voltage d) To modulate frequency Answer: c) To step up or step down voltage Which of the following is true for an ideal transformer? a) No energy loss b) Infinite primary-to-secondary turns ratio c) Zero impedance d) All of the above Answer: a) No energy loss What is the primary function of a voltage divider? a) To amplify voltage b) To regulate voltage c) To attenuate voltage d) To modulate voltage Answer: c) To attenuate voltage Which of the following is a characteristic of a Schottky diode? a) High forward voltage drop b) Fast switching speed c) High reverse breakdown voltage d) Low current carryingWhich of the following components is commonly used to smooth out fluctuations in DC power supplies? a) Zener diode b) Schottky diode c) Capacitor d) LED Answer: c) Capacitor What is the primary function of a Schottky diode? a) Voltage regulation b) Signal amplification c) Fast switching d) Rectification Answer: c) Fast switching Which of the following describes a common-collector configuration of a transistor? a) High input impedance, low output impedance b) Low input impedance, high output impedance c) High input and output impedance d) Low input and output impedance Answer: d) Low input and output impedance What is the primary function of an LC circuit? a) To filter frequencies b) To amplify signals c) To convert AC to DC d) To modulate signals Answer: a) To filter frequencies Which of the following is used to measure the intensity of light in an optical system? a) Photodiode b) Phototransistor c) Photoresistor d) Photovoltaic cell Answer: a) Photodiode Which parameter does a JFET primarily control with the application of a reverse bias voltage? a) Current b) Resistance c) Capacitance d) Inductance Answer: b) Resistance What is the primary function of a varactor diode? a) Voltage regulation b) Signal modulation c) Capacitance modulation d) Frequency modulation Answer: c) Capacitance modulation Which of the following is a characteristic of a PNP transistor? a) Emitter is N-type, collector is P-type b) Emitter is P-type, collector is N-type c) Both emitter and collector are N-type d) Both emitter and collector are P-type Answer: b) Emitter is P-type, collector is N-type What is the primary function of a rectifier circuit? a) To convert DC to AC b) To convert AC to DC c) To amplify signals d) To regulate voltage Answer: b) To convert AC to DC Which of the following materials is commonly used as a core in an inductor? a) Aluminum b) Copper c) Iron d) Gold Answer: c) Iron What is the purpose of a snubber circuit in electronics? a) To protect against overvoltage spikes b) To amplify signals c) To regulate current d) To modulate frequency Answer: a) To protect against overvoltage spikes Which of the following is a characteristic of a common-base configuration of a transistor? a) High input impedance, high output impedance b) Low input impedance, high output impedance c) High input impedance, low output impedance d) Low input impedance, low output impedance Answer: a) High input impedance, high output impedance What is the primary purpose of a tuned amplifier circuit? a) To amplify signals at specific frequencies b) To amplify signals uniformly across all frequencies c) To filter out noise d) To rectify signals Answer: a) To amplify signals at specific frequencies Which of the following is an application of a piezoelectric crystal? a) Temperature sensing b) Frequency modulation c) Voltage regulation d) Sound generation Answer: d) Sound generation What is the primary function of a phase-locked loop (PLL)? a) Frequency modulation b) Voltage regulation c) Phase detection and synchronization d) Signal amplification Answer: c) Phase detection and synchronization Which of the following components is used to protect sensitive electronic circuits from voltage surges? a) Varistor b) Inductor c) Transformer d) Capacitor Answer: a) Varistor What is the purpose of a buffer amplifier in electronics? a) To provide voltage regulation b) To isolate circuits from each other c) To amplify signals d) To modulate signals Answer: b) To isolate circuits from each other Which of the following is a characteristic of an ideal capacitor? a) Stores energy in a magnetic field b) Stores energy in an electric field c) Conducts current in one direction d) Has infinite resistance Answer: b) Stores energy in an electric field

Analog Electronics MCQs

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