WorksheetsECE406L - Midterm Lab Exam
Total questions: 35
Worksheet time: 18mins
Which component is primarily used for measuring voltage, current, and resistance in an experiment?
Oscilloscope
Function generator
Digital Multimeter (DMM)
Power supply
What is the unit of resistance?
Ampere
Ohm
Volt
Watt
When measuring voltage with a DMM, how should the probes be connected?
In series with the circuit
In parallel with the circuit component
Across the power source only
In any manner, as long as the circuit is complete
The resistance of a conductor primarily depends on:
Its material, length, and cross-sectional area
The voltage applied across it
The type of circuit it is in
The ambient temperature only
Which of the following measurements can be taken using a digital multimeter?
Voltage
Current
Resistance
All of the above
When measuring current, how should the DMM probes be connected?
In parallel with the circuit component
In series with the circuit
Across the power source
Directly to ground
Which law relates voltage, current, and resistance?
Kirchhoff's Voltage Law
Faraday's Law
Ohm's Law
Coulomb's Law
What does DSB-SC stand for?
Double Sideband Super Carrier
Dual Signal Band Suppressed Carrier
Double Sideband Suppressed Carrier
Dual Sideband Signal Carrier
What is the primary characteristic of a DSB-SC signal?
It contains only one sideband
It includes a carrier component
The carrier is suppressed
It transmits DC signals
What is the main advantage of DSB-SC over conventional AM?
Simpler circuit design
Reduced bandwidth
Higher power efficiency
Increased noise immunity
How is DSB-SC typically generated?
Using a simple AM modulator
By filtering out one sideband
Through a balanced modulator
By adding a carrier wave to an AM signal
What happens to the carrier frequency component in DSB-SC?
It is doubled
It remains unchanged
It is suppressed
It shifts to a lower frequency
What is the typical bandwidth of a DSB-SC signal if the message signal has a bandwidth of W?
W
2W
W/2
4W
Which demodulation method is commonly used for DSB-SC?
Envelope Detector
Coherent Detection
Frequency Discriminator
Direct Sampling
How is a DSB-SC signal different from SSB-SC (Single Sideband Suppressed Carrier)?
DSB-SC has two sidebands, while SSB-SC has one
SSB-SC transmits the carrier, but DSB-SC does not
DSB-SC requires less bandwidth than SSB-SC
none of the choices
What is the role of a balanced modulator in a DSB-SC system?
To amplify the carrier signal
To remove the carrier and retain sidebands
To generate frequency modulation
To separate AM and FM signals
What type of filter can be used to extract the message signal from a DSB-SC signal?
High-pass filter
Low-pass filter
Band-pass filter
Notch filter
What is the relationship between DSB-SC and AM?
DSB-SC is a form of AM with no carrier
AM is more bandwidth-efficient than DSB-SC
AM does not require demodulation
AM and DSB-SC are completely unrelated
Which circuit is essential for coherent detection of a DSB-SC signal?
Phase-locked loop (PLL)
Envelope detector
Band-reject filter
High-pass amplifier
In AM, what parameter of the carrier wave is varied?
Frequency
Amplitude
Phase
Time duration
What is the modulation index in AM?
Ratio of carrier frequency to signal frequency
Ratio of modulating signal amplitude to carrier amplitude
Ratio of output power to input power
None of the above
What is the function of a modulator in an AM system?
To extract the message signal
To vary the amplitude of the carrier
To amplify the signal
To remove noise
Which of the following circuits is commonly used for AM generation?
Envelope Detector
Balanced Modulator
Oscillator
Phase-Locked Loop (PLL)
What does the envelope detector do in AM demodulation?
Suppresses the carrier
Extracts the original message signal
Increases the amplitude of the signal
Reduces noise
What is the main disadvantage of AM?
High power efficiency
Poor noise resistance
Complex demodulation
Requires high bandwidth
In an AM spectrum, what are the sidebands?
Noise components
Frequencies above the carrier
Frequencies located symmetrically around the carrier
The carrier wave components
How does over-modulation affect an AM signal?
It improves the signal quality
It results in signal distortion
It reduces power consumption
It increases bandwidth
If the carrier frequency is 1 MHz and the modulating signal frequency is 5 kHz, what are the frequencies of the sidebands?
0.995 MHz and 1.005 MHz
1.5 MHz and 2 MHz
1 MHz and 5 MHz
1.5 kHz and 2.5 kHz
What is the power distribution in a standard AM wave with a modulation index of 1?
Carrier power is 1/3 of the total power
Carrier power is 2/3 of the total power
Carrier power is 1/2 of the total power
Carrier power is equal to sideband power
What is single sideband (SSB) modulation?
A form of AM that suppresses one sideband
A technique that transmits only the carrier
A type of FM modulation
A modulation method used only in digital signals
What is the advantage of using SSB over standard AM?
Requires less bandwidth
Transmits the carrier with higher power
Reduces noise completely
Uses frequency modulation principles
What happens when the modulation index exceeds 1 in AM?
Over-modulation occurs
The signal gets distorted
The envelope detector fails
All of the above
What fundamental theorem governs signal sampling?
Fourier Transform Theorem
Nyquist-Shannon Sampling Theorem
Maxwell's Equations
Laplace Transform
According to the Nyquist theorem, the sampling rate should be at least:
Equal to the signal frequency
Twice the highest frequency component of the signal
Half the signal frequency
Ten times the signal frequency
Which component is used to convert an analog signal into a digital form?
Digital-to-Analog Converter (DAC)
Analog-to-Digital Converter (ADC)
Band-pass filter
Modulator
