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AMA University Answers
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Fundamentals of Mixed Signals and Sensors

Showing 1-75 of 98 answers

 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)?
  • X(z+k)
  • zkX(z)
  • z-kX(z) Correct
  • X(z-k)
20
A Answer is a line segment which joins two nodes
  • zkX(z)
  • z-kX(z) Correct
  • X(z-k)
  • X(z+k)
16
A branch has gain but no direction.
  • Represent all the signals, variables, and summing points and take-off points as branches Correct
  • Represent the transfer functions inside the blocks of diagrams as gains of the signal flow diagram
  • Represent the blocks of diagram as branches in signal flow graph
23
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 Correct
  • The function itself
  • An advance in the function by 3 units in time
  • Cannot be determined
27
A device is a Answer when input is electrical and output a physical quantity
  • True
  • False Correct
42
1
A device which converts one form of energy to another
  • Sensor
  • Transducer Correct
  • Resistor
26
A measure of the "amplification" of an amplifier
  • Gain Correct
  • Impedance
  • Efficiency
27
a numerical expression representing the performance or efficiency of a procedure.
  • Figure of merit Correct
  • Figure of error
16
A signal flow graph is the graphical representation of the relationships between the variables of set linear algebraic equations.
  • True Correct
  • False
28
Aliasing arises when a signal is discretely sampled at a rate that is insufficient to capture the changes in the signal.
  • True Correct
  • False
13
Answer is used to measure deflection, stress, pressure, etcThe resistance of the sensing element changes with applied strain
  • True Correct
  • False
66
1
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 Correct
  • 3Hz
  • 12Hz
80
Auto correlation function and energy spectral densities are Fourier transform pairs.
  • True Correct
  • False
23
Biological Phenomena is a common detectable phenomena.
  • True Correct
  • False
23
Capacitance Transducers are used to measure acceleration along one or more axis and are relatively insensitive to orthogonal directions
  • True
  • False Correct
22
Class A amplifier is more efficient than Class B amplifier.
  • True
  • False Correct
19
Class AB that has lower efficinecy of less thant 40% but good signal reproduction and linearity.
  • True
  • False Correct
24
Class C amplifier is used for VHF, UHF and SHF Frequencies.
  • True Correct
  • False
28
Data conversion accuracy enhances system performance In-depth understanding of data converter performance is important in many applications.
  • True
  • False Correct
63
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 Correct
  • False
13
Decimation involves the use of which of the following components?
  • Digital anti-aliasing filter Correct
  • Sampling rate expander
  • Sampling rate compressor
17
Decimation works by inserting zero-valued samples for each input signal.
  • True
  • False Correct
13
DeconvolutionCorrelation is the reverse process of convolution widely used in signal and image processing
  • t=0
  • t>0
  • Always
  • t<0 Correct
15
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
  • True
  • False Correct
64
Faraday’s Law of Induction states that coil resist a change in magnetic field by generating an opposing voltage/current
  • True Correct
  • False
30
FET stands for _____________.
  • Bipolar junction transistor Correct
  • Unipolar junction transistor Correct
  • multi-junction transistor
21
Flywheel Effect See back Effect to transform a temperature difference to a voltage difference
  • True Correct
  • False
12
For a causal L.T.I. system, the impulse response is 0 for _________
  • Auto Correlation
  • Discrete Correlation Correct
  • Cross Correlation
25
Happens in ADCs when an output code does not occur for any input voltage
  • video
  • switch
  • audio Correct
  • motion
12
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-emitter Transistor
  • Filter-effect Transistor
  • Field-effect Transistor Correct
43
Identify which is NOT a step for converting a block diagram into an equivalent signal flow graph.
  • Represent the transfer functions inside the blocks of diagrams as gains of the signal flow diagram
  • Represent the blocks of diagram as branches in signal flow graph
  • Represent all the signals, variables, and summing points and take-off points as branches Correct
28
In an amplifier, if a capacitor can be accurately controlled, then the gain cannot be accurately controlled.
  • True
  • False Correct
22
Increasing the input code should always decrease the output voltage.
  • True
  • False Correct
13
Increasing the input code should always increase the output voltage.
  • True Correct
  • False
15
Is the discrete time LTI system with impulse response h=an (|a| < 1) BIBO stable?
  • A two-sided sequence (neither left nor right-sided) has a ROC consisting of a ring in the z-plane, bounded on the interior and exterior by a pole
  • The ROC cannot contain any poles
  • ROC is a disconnection region Correct
  • The Fourier transform of x[n] converges absolutely if and only if the ROCof the z-transform includes the unit circle
23
It is a mathematical operation used to express the relation between input and output of an LTI system
  • True
  • False Correct
13
It is a measure of the step size error
  • sampling jitter
  • Monotonicity and missing codes
  • Effective number of bits Correct
13
It refers to the measure of similarity between two signals
  • True
  • False Correct
12
Large signals uses this kind of amplifier
  • True
  • False Correct
13
Multirate systems can increase or decrease the sampling-rate of a signal.
  • True Correct
  • False
13
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 Correct
  • False
19
Power Density Spectrum is the measure of similarity between two different signals.
  • Power Density Spectrum Correct
  • Energy Density Spectrum
20
Radio Frequencies uses Class B amplifier with the configuration of common collector .
  • True
  • False Correct
23
Refers to the preservation of information.
  • Interpolation Correct
  • Decimation
105
Signal flow graphs are reliable to find transfer function than block diagram reduction technique.
  • True Correct
  • False
23
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 Correct
  • False
12
Switched capacitor circuits can be used to build regulators.
  • True Correct
  • False
21
Switched capacitor-integrator is more accurate than continuous time integrator.
  • True Correct
  • False
20
Tells us the frequency where the SINAD is 3 dBlower than the best case value
  • True
  • False Correct
13
The ADC quantizes the input voltage to a finite number of bits.
  • Figure of merit Correct
  • Figure of error
14
The common conversion methods are Physical, RadioactiveChemicalMagnetic , and biological
  • Change the overlapping area of the parallel electrodes Correct
  • Change distance between the parallel electrodes Correct
  • Change the size of the capacitor
14
The convolution of a discrete signal with itself is _________
  • Squaring the signal Correct
  • None of the above
  • Doubling the signal
  • Adding two signals
20
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 Correct
  • Cannot be determined
  • An advance in the function by 3 units in time
  • The function itself
28
The cost is an economic factor to consider in choosing a sensor.
  • Transducer Correct
  • Resistor
  • Sensor
26
The easiest way to smooth a signal is to increase its resolution.
  • True
  • False Correct
16
The FET is a unipolar junction transistor.
  • common base
  • common collector
  • common emitter
  • common gate Correct
20
The FET's three terminals are Source,Drain and CollectorBaseGate
  • Class A Amplifier Correct
  • Class B Amplifier
  • Class C Amplifier
13
the inverse z-transform can be performed by evaluating a Answer integral
  • x+y =E2=86=94X(z)Y(z)
  • xy =E2=86=94X(z)+Y(z)
  • xy =E2=86=94X(z)Y(z)
  • x+y =E2=86=94X(z)+Y(z) Correct
16
The most inefficient amplifier class of amplifier.
  • Class AB Amplifier
  • Class B Amplifier
  • Class C Amplifier Correct
18
The multistage approach allows a significant relaxation of the anti-alias and anti-imaging filters, with a consequent reduction in the filter complexity
  • True Correct
  • False
14
The narrowband amplifies a specific range of frequencies, to the exclusion of other frequencies.
  • True Correct
  • False
21
The opposition exhibited by its output terminals to an alternating current (AC) of a particular frequency is called Amplifier Efficiency.
  • True
  • False Correct
21
The range of a convuluted signal of two unequal rectangles is the difference of the lower limits and upper limits.
  • Shifting property
  • Differentiation of Output
  • Convolution with impulse
  • Integration of Output Correct
26
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
  • True
  • False Correct
27
The sampling frequency should be less than the highest frequency contained in the signal.
  • True
  • False Correct
16
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 Correct
  • False
16
The subscript ___________ is added to the period of clock signal T to emphasize that it's the clock signal.
  • T
  • CLK Correct
  • Ton
19
The term SONAR stands for "Solar Navigation and Radar"
  • Chemical
  • Sound Correct
  • Physical Correct
  • Biological
28
The three terminals of a semiconductor are called emmiter,base and gate.
  • True
  • False Correct
20
The two types of convolution are continuous and discrete convolution.
  • True Correct
  • False
23
This tells us how many of these bits contains useful information.
  • Uniform quantization steps are not constant Correct
  • Quantization error uncorrelated with input
  • All quantization levels have equal probability
14
Transistor where the current condition is due to both charge carries of holes and electrons
  • True Correct
  • False
13
Ultrasonic sensors are used for position measurements.
  • True Correct
  • False
26
Use mason’s gain formula to find the transfer function of the given signal flow graph:
  • adcdef/1-(bc+ef)+bcef
  • abd/1-(bc+ef)+bcef
  • abd/1-(ac)
  • abdeg/1-(bc+ef)+bcef Correct
26
What are the types of Transistor? (Choose two)
  • Unipolar junction transistor Correct
  • Bipolar junction transistor Correct
  • multi-junction transistor
22
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