Latches are commonly organized into groups of 4-bits, 8-bits or more into registers.
1 point
True
False
An asynchronous counter is one where all stages of the counter trigger together.
1 point
True
False
Pull-up resistors and special interface ICs are typically used as an interface between different logic families.
1 point
True
False
Which logic gate provides a low output only when an odd number of inputs are high?
1 point
and
or
exclusive OR
exclusive NOR
Which of the following measurements is not analog in nature?
1 point
speed
weight
data storage
pressure
Karnaugh mapping is an easy-to-use graphic method of simplifying Boolean expressions.
1 point
True
False
The heart of a voltage comparator is an operational amplifier.
1 point
True
False
Most newly designed electronic devices contain digital circuitry.
1 point
True
False
A mod-8 counter has how many different output states?
1 point
2
4
8
16
Digital-to-analog converters consist of a resistor network and a difference amplifier.
1 point
True
False
How many J-K flip-flops are needed to wire a modulo-16 counter?
1 point
one
two
four
eight
Decoders are _______________ logic circuits with several inputs and outputs.
1 point
inverted
encrypted
combinational
digital
In an unregulated power supply, if load current increases, the output voltage _________
1 point
Remains the same
Decreases
Increases
None of the above.
The clocked R-S flip-flop looks almost like an R-S flip-flop except that it has one extra input labeled CLK.
1 point
True
False
What is the 8421 BCD code equivalent for the decimal number 36?
1 point
0100 0110
0110 0011
0011 0110
0010 0100
A circuit that operates by using only high and low signals is called
1 point
a digital circuit
an analog circuit
a rectifier circuit
a filter circuit
In a synchronous counter it is necessary to have all stages of the counter trigger together.
1 point
True
False
The J-K flip-flop has the features of all the other types of flip-flops.
1 point
True
False
The Boolean expression A ∙ B + C ∙ D = Y is called the sum-of-products or what form?
1 point
maxterm
xor
nand
minterm
Op amps are characterized by high input impedance, low output impedance, and a variable voltage gain that is set
1 point
at the manufacturer
with external resistors
with internal capacitors
with external inductors
Integrated circuits within a logic family are designed to interface easily with one another.
1 point
True
False
A counter that counts from lower to higher numbers is called an up counter.
1 point
True
False
The 8421 binary-coded decimal code is frequently referred to as the BCD code.
1 point
True
False
The LED is nothing like a PN-junction diode.
1 point
True
False
The D/A converter converts analog information to digital data.
1 point
True
False
Excellent noise immunity is a characteristic of which logic family?
1 point
CMOS
DDL
TTL
RTL
Applying 1.6 V to a TTL input is interpreted by the IC as what logic level?
1 point
high
low
undefined
undetermined
Minterm Boolean expressions are used to create which logic circuits?
1 point
nor-nor
nor-nand
nand-nor
and-or
The binary number system is sometimes called the
1 point
base 2 system
base 8 system
base 10 system
base 16 system
Which logic circuit law allows for the back and forth conversion from minterm to maxterm forms of Boolean expressions?
1 point
Kirchhoff
Karnaugh
De Morgan
Fourier
If the light intensity on the photocell is reduced, which of the following results
1 point
resistance of the photocell decreases
resistance of the photocell increases
increase in current through series resistances R2 and R3
an increase in the reading at the binary outputs
The basic building block for sequential logic is the logic gate.
1 point
True
False
Digital signals are composed of two well-defined voltage levels.
1 point
True
False
This is the logic symbol for a(n)
1 point
AND gate
NOT gate (inverter)
OR gate
ANAND gate
What is the decimal number for the BCD number 0010 1001 0111?
1 point
279
479
297
497
The invert bubble at the clock input of a D flip-flop
1 point
shows the triggering occurs on the negative-going edge of the clock
shows the triggering occurs on the positive-going edge of the clock
causes the clock signal to be 180° out of phase
disables the clock signal
The truth table for three variables has how many possible combinations?
1 point
2
4
8
16
The most widely used rectifier is___
1 point
half-wave rectifier
centre-tap full wave rectifier
bridge full-wave rectifier
none of the above
A very common output device used to display decimal numbers is the seven-segment display.
1 point
True
False
The unique output of the NAND function is a low output only when all inputs are low.
1 point
True
False
The D flip-flop has only one data input and a clock input.
1 point
True
False
4. Which of the following is not related to digital systems?
1 point
calculations
data manipulation
alphanumeric outputs
position measurements
In: Electrical Engineering
a) What is the advantages of using a wound-rotor type of induction motor? Under what conditions?
b) When starting a wound rotor induction motor, what is the supposed value of resistance of the slip-ring starter?
c) What is the wound rotor method of speed control?
In: Electrical Engineering
which type of the dc generators has the poorest voltage regulation
In: Electrical Engineering
Frequency Modulation (Simulation):
Briefly discuss some techniques that you could use to modify the modulation index, and also, to increase the signal bandwidth for this FM signal.
In: Electrical Engineering
Part 1: Solve the operation 75.38-18.62 in binary using two's complement. Use 6 bits for the fractionary part.
Part 2:Convert the result to a decimal, and explain how much is the absolute error obtained in the operation.
(Provide Step by Step process of problem solving in each part.)
In: Electrical Engineering
Describe the functions provided by the microcontroller PIC24FJ256GB106 whihc is used in printers such as HP Office Jet 6000?
only functionality, no features needed
In: Electrical Engineering
Design an experiment setup for determination the time constant of a thermistor?
In: Electrical Engineering
energy and power of signals.
(a) Plot the signal x(t) = e−tu(t) and determine its energy. What is the power of x(t)?
(b) How does the energy of z(t) = e−∣t∣, −∞ < t < ∞, compare to the energy of z1(t) = e−tu(t)? Carefully plot the two signals.
(c) Consider the
signal
y(t)
=
sign[xi(t)]
=
1
xi(t)
≥
0
−1 xi(t) < 0
for −∞ < t < ∞,i = 1,2. Find the energy and the power of y(t) when (a)x1(t) = cos(2πt) (b)x2(t) = sin(2πt)
Plot y(t) in each case.
(d) Given v(t) = cos(t) + cos(2t).
i.
Compute the
power of v(t).
ii.
Determine the
power of each of the components of v(t),
add
them and compare the result to the power of v(t).
(e) Find the power of s(t) = cos(2πt) and of f(t) = s(t)u(t). How do
they compare?
Answers: (a) Ex = 0.5; (b) Ez = 2Ez1; (c) Py = 1; (d) Pv = 1.
In: Electrical Engineering
Sketch the energy band diagrams for metals, insulators and semiconductors and explain the how they differ based on the bandgap, density of states and conductivity.
In: Electrical Engineering
Two common load components for electrical energy is Heat (Heater) and Light (Lamp).
Please research the material used to construct these load elements and provide a summary.
1- Performance Property of Material
2- Different materials used
In: Electrical Engineering
1. Explain briefly the operation of a bi-polar transistor as a switch.
In: Electrical Engineering
a. Calculate the electron density (your unit should be correct)
for a CNT at T = 0K. Assume that the Fermi level is at Ef = 1eV and
the bottom of the conduction band is at Ec = 0.8eV. Use 1D density
of states (DOS). Electron effective mass = 0.5m0
b. Will your result change if the Fermi level is at Ef = 0.8eV and
the bottom of the conduction band is at Ec = 0.6eV.
In: Electrical Engineering
5.4 Explain the following terms:
(a) calibration chain
(b) traceability
(c) standards laboratory
In: Electrical Engineering
Briefly describe (10 to 15 sentences) how an analog oscilloscope displays a periodic waveform. Assume the trigger is set to the same channel as the periodic waveform being displayed. Be sure to clearly describe the relationship between the trigger, oscillating signal, and CRT sweep rate. The reader should have a good idea why a periodic waveform appears stationary on the oscilloscope. You can sketch diagrams if that helps your explanation.
In: Electrical Engineering
1. Give an example in which regression toward the mean might occur?
2. Write out an example of a question and responses, using EGWA scale?
In: Electrical Engineering