Rectifiers are electronic circuits that convert alternating current (AC) into direct current (DC). Common examples are half-wave and full-wave rectifiers.
What is the forward voltage drop of a silicon diode in its conducting state?
A 0.3 V
B 0.7 V
C 1.1 V
D 0 V
Silicon diodes have a typical forward voltage drop of 0.7 V when conducting. For germanium diodes, this is around 0.3 V.
What is the unit of capacitance?
A Ohm
B Farad
C Henry
D Coulomb
Capacitance is measured in farads (F) and represents the ability of a component to store charge.
What is the primary purpose of an inductor in analog circuits?
A To store energy in a magnetic field
B To amplify signals
C To store energy in an electric field
D To convert DC to AC
Inductors store energy in their magnetic field when current flows through them and are commonly used in filters and oscillators.
What does the term “gain” in amplifiers refer to?
A Power loss
B Voltage or current increase
C Resistance reduction
D Signal filtering
Gain is the ratio of output signal amplitude to input signal amplitude in an amplifier. It can be expressed as voltage gain, current gain, or power gain.
Which type of amplifier operates only for less than 180 degrees of the input signal cycle?
A Class A
B Class B
C Class C
D Class AB
Class C amplifiers are biased such that they conduct for less than half of the input signal cycle, making them suitable for high-frequency applications like RF transmitters.
What does a transistor act as in a switching circuit?
A A resistor
B A capacitor
C A switch
D A voltage source
Transistors act as switches by turning on (conducting) or off (non-conducting) states depending on the applied input signal.
Which part of a transistor controls the flow of current?
A Collector
B Base
C Emitter
D None of the above
In a transistor, the base acts as a control terminal, allowing or restricting current flow between the collector and emitter.
What is the function of a capacitor in a filter circuit?
A To block DC while allowing AC
B To amplify signals
C To reduce current
D To store magnetic energy
Capacitors in filter circuits block DC components while allowing AC signals to pass, making them essential in signal conditioning.
Which amplifier configuration is known for providing high input impedance?
A Common Collector
B Common Emitter
C Common Base
D Push-Pull
The common collector configuration (emitter follower) has high input impedance and is used for impedance matching.
In an operational amplifier, what is the ideal value of the input offset voltage?
A Zero
B Infinite
C Negative
D Positive
The ideal input offset voltage of an op-amp is zero, meaning no input voltage is needed to make the output zero.
What determines the frequency of oscillation in an RC oscillator?
A Resistance only
B Capacitance only
C Both resistance and capacitance
D None of the above
In an RC oscillator, the frequency of oscillation is determined by the values of the resistors and capacitors in the circuit.
Which type of rectifier uses four diodes in its circuit?
A Half-wave rectifier
B Full-wave rectifier
C Bridge rectifier
D Voltage multiplier
A bridge rectifier uses four diodes arranged in a bridge configuration to convert AC to DC efficiently.
What is the role of feedback in an oscillator circuit?
A To amplify noise
B To stabilize DC voltage
C To sustain oscillations
D To block signals
Positive feedback in an oscillator circuit feeds a portion of the output back to the input to sustain oscillations.
What is the bandwidth of an amplifier?
A The range of frequencies it can amplify
B The range of voltages it can handle
C The maximum gain it can provide
D The input impedance
Bandwidth refers to the range of frequencies over which an amplifier operates effectively without significant loss in gain.