1. Wave shaping is the process of:
A. Amplifying signals
B. Changing the shape of a signal waveform
C. Converting DC signals to AC signals
D. Filtering noise from a signal
Answer: B. Changing the shape of a signal waveform
2. The purpose of a clipping circuit in wave shaping is to:
A. Eliminate high-frequency noise
B. Limit the amplitude of the input signal
C. Amplify the signal without distortion
D. Change the waveform frequency
Answer: B. Limit the amplitude of the input signal
3. A clipping circuit uses a diode to:
A. Increase the peak voltage
B. Remove the high-frequency components
C. Limit the voltage to a specific level
D. Filter the signal
Answer: C. Limit the voltage to a specific level
4. Which of the following is a typical application of a wave shaping circuit?
A. Voltage regulation
B. Signal amplification
C. Generating square or pulse waveforms
D. Filtering AC signals
Answer: C. Generating square or pulse waveforms
5. In a diode clipper circuit, when the input voltage exceeds a certain threshold, the diode:
A. Passes the entire signal through
B. Clips the signal by conducting and shunting it
C. Blocks the signal entirely
D. Amplifies the signal
Answer: B. Clips the signal by conducting and shunting it
6. A high-pass filter in a wave shaping circuit allows signals:
A. Below a certain cutoff frequency to pass
B. Above a certain cutoff frequency to pass
C. In the range of the cutoff frequency to pass
D. All frequencies to pass
Answer: B. Above a certain cutoff frequency to pass
7. A low-pass filter allows signals to pass that are:
A. Higher than the cutoff frequency
B. Lower than the cutoff frequency
C. Equal to the cutoff frequency
D. Both above and below the cutoff frequency
Answer: B. Lower than the cutoff frequency
8. A differentiator circuit in wave shaping is used to:
A. Amplify high-frequency signals
B. Pass all frequencies equally
C. Detect the rate of change of the input signal
D. Filter low-frequency noise
Answer: C. Detect the rate of change of the input signal
9. A integrator circuit in wave shaping is used to:
A. Increase the frequency of the input signal
B. Sum the input signal over time to produce a ramp output
C. Amplify the input signal
D. Filter high-frequency components
Answer: B. Sum the input signal over time to produce a ramp output
10. The main characteristic of an attenuator is to:
A. Amplify the signal
B. Increase the bandwidth of the signal
C. Reduce the amplitude of the signal
D. Increase the frequency of the signal
Answer: C. Reduce the amplitude of the signal
11. Signal conditioning refers to the process of:
A. Amplifying signals to high voltages
B. Modifying a signal to make it suitable for further processing
C. Removing noise from a signal
D. Filtering out unwanted frequencies
Answer: B. Modifying a signal to make it suitable for further processing
12. A common goal of signal conditioning is to:
A. Increase the signal’s bandwidth
B. Match the signal to the input requirements of the next stage of the circuit
C. Increase the signal’s frequency
D. Remove DC components of the signal
Answer: B. Match the signal to the input requirements of the next stage of the circuit
13. Which of the following devices is commonly used for amplifying weak signals in signal conditioning?
A. Voltage regulator
B. Operational amplifier (Op-Amp)
C. Diode rectifier
D. High-pass filter
Answer: B. Operational amplifier (Op-Amp)
14. Isolation in signal conditioning is often used to:
A. Increase the noise in the signal
B. Protect the signal source from the load
C. Amplify the signal
D. Decrease the bandwidth of the signal
Answer: B. Protect the signal source from the load
15. In signal conditioning, filtering is used to:
A. Convert the signal from analog to digital
B. Separate the desired frequencies from unwanted frequencies
C. Reduce the amplitude of the signal
D. Increase the noise in the signal
Answer: B. Separate the desired frequencies from unwanted frequencies
16. In analog-to-digital conversion (ADC), signal conditioning is important because:
A. It increases the signal’s voltage
B. It ensures the signal is within the range that the ADC can handle
C. It decreases the signal’s noise
D. It converts the analog signal into a digital signal directly
Answer: B. It ensures the signal is within the range that the ADC can handle
17. A buffer amplifier in signal conditioning is used to:
A. Increase the power of the signal
B. Provide high input impedance and low output impedance
C. Amplify the signal linearly
D. Filter the high-frequency noise
Answer: B. Provide high input impedance and low output impedance
18. A sample-and-hold circuit in signal conditioning is used to:
A. Sample the input signal and hold the value at a specific point in time
B. Amplify the signal
C. Integrate the signal over time
D. Clip the signal at a certain voltage level
Answer: A. Sample the input signal and hold the value at a specific point in time
19. In signal conditioning for sensors, a transimpedance amplifier is used to:
A. Convert a voltage signal to a current signal
B. Convert a current signal to a voltage signal
C. Amplify the signal with low distortion
D. Filter unwanted frequencies
Answer: B. Convert a current signal to a voltage signal
20. In a digital system, a comparator is used for signal conditioning to:
A. Convert analog signals to digital signals
B. Compare two signals and provide a binary output
C. Amplify the signal
D. Filter noise from the signal
Answer: B. Compare two signals and provide a binary output