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WorksheetsCPET 7 - Midterm Exam
Total questions: 70
Worksheet time: 35mins
The process of approximating the continuous set of values with a finite set of values is called:
Modulation
Sampling
Quantization
Approximation
Select the correct order of blocks in PCM Transmitter
Encoder, Quantizer, Sampler, Low Pass Filter
Low Pass Filter, Quantizer, Sampler, Encoder
Low Pass Filter, Sampler, Quantizer, Encoder
Low Pass Filer, Encoder, Sampler, Quantizer
The block that is NOT present in a PCM Transmitter
Low Pass Filter
Sampler
Encoder
Amplifier
The difference between the actual analog value and approximated discrete value due to the rounding is called
Quantization Error
Sampling Error
Reading Error
Actual Error
Each quantized sample is assigned the binary code that represents the discrete amplitude value closest to the pulse's actual value. This is known as
Encoding
Sampling
Quantizing
Decoding
A _________ quantizer uses equal length quantization intervals linearly related to analog sample values.
Uniform
Non-Uniform
A minimum sampling rate is ___ times the highest frequency component or upper bandwidth limit of the analog signal as per the sampling theorem.
2
4
6
8
Identify the type of modulation
PAM
PPM
PWM
PCM
Sampling is a process in which _________ of continuous time signal is measured at discrete instants
Frequency
Amplitude
Phase
Wavelength
Identify the type of Sampling
Flat top sampling
Instantaneous sampling
Natural sampling
In ____, the frequency of the analog carrier signal is varied proportional to the digital information signal.
ASK
FSK
PSK
MSK
Identify the modulation technique followed to obtain the above shown modulated signal
ASK
FSK
PSK
MSK
Which of the following CANNOT be defined as a Digital to Analog conversion technique
AM
ASK
PSK
QAM
In ASK, the ____ of the carrier is varied to represent two or more different signal elements
Amplitude
Phase
Frequency
All of the above
___ is the process of converting analog data to digital signals
Modulation
Digitization
Demodulation
Encoding
Which one of these is NOT an example of a benefit of converting analog signals to digital signals?
Digital Signals last forever
Digital Signals are easier to use and send
Digital Signals can be used among every Digital Divice
Digital Signals can have quantization noise
What is the term used to determine the quality of a quantizer?
Computing Power
Resolution
Quantization
Sampling Rate
What part of a graph represents quantization?
x-axis
y-axis
What part of a graph represents sampling?
x-axis
y-axis
What does Quantization represent in an ADC?
The rate of taking measurements of the amplitude of voltage
The amount of precision among the values being measured
Snippets of different songs being used in the creation of new song beats.
What does Sampling represent in an ADC?
The rate of taking measurements of the amplitude of voltage
The amount of precision among the values being measured
Snippets of different songs being used in the creation of new song beats.
In our discussion of a cell phone, how is the change in voltage created that heads to the ADC?
A coil and magnet creates sound waves which then lead into the wires
The magnet generates electricity by generating sound which is then converted into induction
Sound becomes a wave and then is captured by the ADC and turned into Electricity
The Kinetic Energy of sound is converted into Electrical Energy from the microphone coil and Magnet
What are the steps that an ADC takes to convert an analog signal?
Sound capture, Sound transfer, Digitization
Discrete capture, Longitudinal Division, Quantizer
Sampling, Quantization
Electromagnetic Induction, Right Hand Rule
Which type of signal is discrete?
Analog
Digital
Which type of signal is continuous?
Analog
Digital
A PCM encoder includes which three processes?
Sampling
Quantizing
Modulating
Encoding
In phase shift keying, the ______ of the carrier is varied to represent two or more different signal elements.
Amplitude
Frequency
Phase
All of the above
The two input terminals of an op amp are labeled as:
high and low
positive and negative
inverting and noninverting
differential and nondifferential
For an ideal op amp, which of the following statements is not true?
The differential voltage across the input terminals is zero
The current into the input terminals is zero
The current from the output terminal is zero
The output resistance is zero
For the circuit, voltage vo is
-6 V
-5 V
-1.2 V
-0.2 V
For the circuit, current ix is
0.6 mA
0.5 mA
0.2 mA
0.083 mA
If vs = 0 V in the circuit, current io is
-10 mA
-2.5 mA
0.83 mA
0.714 mA
If vs = 8 mV in the circuit, the output voltage is:
-44 mV
-8 mV
4 mV
7 mV
If vs = 8 mV, voltage va is:
-8 mV
0 mV
3.33 mV
8 mV
The power absorbed by the 4 kohm resistor is:
9 mV
4 mV
2 mV
1 mV
Which of these amplifiers is used in a digital-to-analog converter?
noninverter
voltage follower
summer
difference amplifier
Difference amplifiers are used in (please check all that apply):
instrumentation amplifiers
voltage followers
voltage regulators
summing amplifiers
What is the INPUT impedance of an IDEAL amplifier?
0 Ω
100 Ω
1 000 Ω
1 000 000 Ω
Infinite impedance
What sort of amplifier is this?
Summing amplifier
Voltage follower
Inverting amplifier
Non-inverting amplifier
Identify the Circuit Diagram
Differentiator
Integrator
Adder
Subtractor
When a differential amplifier is operated single-ended, …………
the output is grounded
one input is grounded and signal is applied to the other
both inputs are connected together
the output is not inverted
Differential amplifiers are used in
Instrumentation amplifiers
Voltage followers
Voltage regulators
Buffers
The differential gain is ………
very high
very low
dependent on input voltage
about 100
If the input of this circuit Vin = 6V what is Vout?
+6 V
-6 V
+12 V
-12 V
0
One of the characteristics of the op-amp circuit as an amplifier is
V+ is 0
V- is 0
V+ = V-
Vout = 0
Identify the Circuit Diagram
Differentiator
Integrator
Adder
Subtractor
Which of the following properties should an ideal op amp have?
Infinitely wide bandwidth, infinitely high output impedance and perfect linearity.
High DC gain, low input reactance and perfect linearity
Infinitely high input impedance, perfect linearity and zero noise.
Infinitely high gain, perfect linearity and zero input impedance.
When a differential amplifier is operated single-ended, …………
the output is grounded
one input is grounded and signal is applied to the other
both inputs are connected together
the output is not inverted
Select the Correct Ideal Characteristic's of OP AMP
(Multiple Selection)
Slew Rate
Equivalent ratio
CMRR
Differential voltage
Feedback Resistance
Is Virtual Ground and Virtual Short Concept are same ??
YES
NO
The input offset current equals the ……….
difference between two base currents
average of two base currents
collector current divided by current gain
none of these
Differential amplifiers are used in
Instrumentation amplifiers
Voltage followers
Voltage regulators
Buffers
The two input terminals of an Op Amp are labeled as
High and low
Positive and negative
Inverting and non inverting
Differential ans non differential
The differential gain is ………
very high
very low
dependent on input voltage
about 100
For the OP-AMP given in figure, the voltage gain will be:
-R2/R1
-R3/R1
-(R2+R3)/R1
-(R2||R3)/R1
Assume that the op-amp of the figure is ideal. If Vi is a triangular wave, then V0 will be
triangular wave
square wave
parabolic wave
sine wave
An ideal operational amplifier has
infinite output impedance
zero input impedance
infinite bandwidth
All of the above
Identify the circuit
Inverting amplifier
voltage follower
Differential amplifier
Non inverting amplifier
Identify the circuit
Inverting amplifier
voltage follower
Differential amplifier
Non inverting amplifier
The gain equation of inverting amplifier is
R1/Rf
Rf/R1
-Rf/R1
-R1/Rf
The gain equation of Non-inverting amplifier shown in figure
-Rf/R2
Rf/(R2+Rf)
(R2+Rf)/Rf
(R2+Rf)/R2
What is the feedback factor of voltage follower circuit?
Zero
Unity
Infinity
Between zero & one
Determine the output voltage for this circuit with a sinusoidal input of 2.5 mV.
–0.25 V
–0.125 V
0.25 V
0.125 V
A filter that provides a constant output up to a cutoff frequency and passes no signal above that frequency is called a ________ filter.
High-pass
Band pass
Band stop
Low-pass
What is the name of the op amp
Non-inverting Op Amp
Inverting Op Amp
Summing Amplifier
Differential Amplifier
What is the name of the Positive terminal and Negative terminal?
Positive terminal = non-inverting input
Negative terminal = non-inverting input
Positive terminal = inverting input
Negative terminal = non-inverting input
Positive terminal = inverting input
Negative terminal = inverting input
Positive terminal = non-inverting input
Negative terminal = inverting input
If input signal to the negative terminal and grounded the positive terminal, what is the output signal?
Output signal is non-inverted
Output signal is inverted
