Fundamentals of Mixed Signals and Sensors

ECE 6171 Fundamentals of Mixed Signals and Sensors

According to Time shifting property of z-transform, if X(z) is the z-transform of x then what is the z-transform of x(n-k)?	z-kX(z)
A Answer is a line segment which joins two nodes	z-kX(z)
A branch has gain but no direction.	Represent all the signals, variables, and summing points and take-off points as branches
A continuous signal can be represented as the product of an impulse function and the signal itself.	A delay in the function by 3 units in time
A device is a Answer when input is electrical and output a physical quantity	False
A device which converts one form of energy to another	Transducer
A measure of the "amplification" of an amplifier	Gain
a numerical expression representing the performance or efficiency of a procedure.	Figure of merit
A signal flow graph is the graphical representation of the relationships between the variables of set linear algebraic equations.	True
Aliasing arises when a signal is discretely sampled at a rate that is insufficient to capture the changes in the signal.	True
Answer is used to measure deflection, stress, pressure, etcThe resistance of the sensing element changes with applied strain	True
At what frequency should a signal composed of a single sinewave at a frequency of 6 Hz be sampled in accordance to the Nyquist Theorem?	6Hz
Auto correlation function and energy spectral densities are Fourier transform pairs.	True
Biological Phenomena is a common detectable phenomena.	True
Capacitance Transducers are used to measure acceleration along one or more axis and are relatively insensitive to orthogonal directions	False
Class A amplifier is more efficient than Class B amplifier.	False
Class AB that has lower efficinecy of less thant 40% but good signal reproduction and linearity.	False
Class C amplifier is used for VHF, UHF and SHF Frequencies.	True
Data conversion accuracy enhances system performance In-depth understanding of data converter performance is important in many applications.	False
Data converters must represent blank continuous values in a range using a set of discrete values A blank binary code is used to represent the value	True
Decimation involves the use of which of the following components?	Digital anti-aliasing filter
Decimation works by inserting zero-valued samples for each input signal.	False
DeconvolutionCorrelation is the reverse process of convolution widely used in signal and image processing	t<0
Electric Field transmission lines Magnetic Field coaxial lines sensors are used for power steering,security, and current measurements on Electric Field transmission lines Magnetic Field coaxial lines	False
Faraday’s Law of Induction states that coil resist a change in magnetic field by generating an opposing voltage/current	True
FET stands for _____________.	Bipolar junction transistorUnipolar junction transistor
Flywheel Effect See back Effect to transform a temperature difference to a voltage difference	True
For a causal L.T.I. system, the impulse response is 0 for _________	Discrete Correlation
Happens in ADCs when an output code does not occur for any input voltage	audio
Identify the FET terminals stated :blankSource , terminal through which the carriers enter the channel blank Drain , where the carriers leave the channel blankGate , the terminal that modulates the channel conductivity	Field-effect Transistor
Identify which is NOT a step for converting a block diagram into an equivalent signal flow graph.	Represent all the signals, variables, and summing points and take-off points as branches
In an amplifier, if a capacitor can be accurately controlled, then the gain cannot be accurately controlled.	False
Increasing the input code should always decrease the output voltage.	False
Increasing the input code should always increase the output voltage.	True
Is the discrete time LTI system with impulse response h an (|a| < 1) BIBO stable?	ROC is a disconnection region
It is a mathematical operation used to express the relation between input and output of an LTI system	False
It is a measure of the step size error	Effective number of bits
It refers to the measure of similarity between two signals	False
Large signals uses this kind of amplifier	False
Multirate systems can increase or decrease the sampling-rate of a signal.	True
Power amplifier delivers power to the load  and is the product of the voltage and current applied to the load  with the output signal power being greater that the input signal power.	True
Power Density Spectrum is the measure of similarity between two different signals.	Power Density Spectrum
Radio Frequencies uses Class B amplifier with the configuration of common collector .	False
Refers to the preservation of information.	Interpolation
Signal flow graphs are reliable to find transfer function than block diagram reduction technique.	True
Small Amplifiers are designed to amplify very small signal voltage levels of only a few Class A AmplifiersSmall Signal AmplifiersLarge Signal Amplifiers from sensors or audio signals	True
Switched capacitor circuits can be used to build regulators.	True
Switched capacitor-integrator is more accurate than continuous time integrator.	True
Tells us the frequency where the SINAD is 3 dBlower than the best case value	False
The ADC quantizes the input voltage to a finite number of bits.	Figure of merit
The common conversion methods are Physical, RadioactiveChemicalMagnetic , and biological	Change the overlapping area of the parallel electrodesChange distance between the parallel electrodes
The convolution of a discrete signal with itself is _________	Squaring the signal
The convolution of a function with an impulse function delayed to an instant 3 in time results in ____________	A delay in the function by 3 units in time
The cost is an economic factor to consider in choosing a sensor.	Transducer
The easiest way to smooth a signal is to increase its resolution.	False
The FET is a unipolar junction transistor.	common gate
The FET's three terminals are Source,Drain and CollectorBaseGate	Class A Amplifier
the inverse z-transform can be performed by evaluating a Answer integral	x+y -E2-86-94X(z)+Y(z)
The most inefficient amplifier class of amplifier.	Class C Amplifier
The multistage approach allows a significant relaxation of the anti-alias and anti-imaging filters, with a consequent reduction in the filter complexity	True
The narrowband amplifies a specific range of frequencies, to the exclusion of other frequencies.	True
The opposition exhibited by its output terminals to an alternating current (AC) of a particular frequency is called Amplifier Efficiency.	False
The range of a convuluted signal of two unequal rectangles is the difference of the lower limits and upper limits.	Integration of Output
The resulting signal when a continuous time periodic signal x(t) having period T, is convolved with itself is a periodic having period of T/2	False
The sampling frequency should be less than the highest frequency contained in the signal.	False
The simple way to avoid aliasing of course is to always have enough samples to capture the spatial or temporal variations in a signal.	True
The subscript ___________ is added to the period of clock signal T to emphasize that it's the clock signal.	CLK
SONAR stands for "Solar Navigation and Radar"	SoundPhysical
The three terminals of a semiconductor are called emmiter,base and gate.	False
The two types of convolution are continuous and discrete convolution.	True
This tells us how many of these bits contains useful information.	Uniform quantization steps are not constant
Transistor where the current condition is due to both charge carries of holes and electrons	True
Ultrasonic sensors are used for position measurements.	True
Use mason’s gain formula to find the transfer function of the given signal flow graph:	abdeg/1-(bc+ef)+bcef
What are the types of Transistor? (Choose two)	Unipolar junction transistorBipolar junction transistor
What density spectrum can be measured in this formula?	Squaring the signal
What is ADC?	Analog-to-Digital Converter
What is DAC?	Digital-to-Analog Converter
What is the classification of amplifier that uses the common emitter configuration of transistor?	Class A Amplifier
What is the formula for noise power spectral density?	Total power / bandwidth
What is the ROC of z-transform of finite duration anti-causal sequence?	z-E2-88-9E
What is the set of all values of z for which X(z) attains a finite value?	3/(1-2z-1)-4/(1-3z-1)
What is the z-transform of the signal x B1nu(-n-1)?	True
What is the z-transform of the signal x [3(2n)-4(3n)]u?	3/(1-2z-1)-4/(1-3z-1)
What should be the sampling frequency if the highest frequency of the signal is 5Hz?	5hz
Which is NOT a property of convolution?	Integration of Output
Which is NOT a property of the region of convergence?	ROC is a disconnection region
Which is NOT a quantization noise assumption?	Uniform quantization steps are not constant
Which is NOT a static specification?	jitter
Which is NOT a transistor configuration?	common gate
Which is not a type of correlation?	Discrete Correlation
Which is NOT an effect of aliasing?	Retinal images
Which of the following is/are an analog input/output ?	audio
Which of the following is/are NOT a detectable phenomena?	SoundPhysical
Which of the following justifies the linearity property of z-transform?[x↔X(z)].	x+y ↔X(z)+Y(z)
Which of the following series has an ROC as mentioned below?	αnu
Which of the following variations can be done to make capacitance based sensors ? (Choose one or more)	Change the overlapping area of the parallel electrodes Change distance between the parallel electrodes