AET 2090 Midterm Exam Questions and
Answers
A _____ input physically isolates the circuitry that follows from induced currents in the
cable - ANSWER-transformer-isolated
A circuitry is considered balanced if the signal (+) and the return (-) - ANSWER-have
equal reference to the ground
A measure of the amount if energy generated or dissipated per unit of time, measured
in watts - ANSWER-power
A winding coil represents _____, which presenters lower opposition to low frequencies
and higher opposition to high frequencies - ANSWER-inductance
Common Mode Rejection - ANSWER-the characteristic of a balanced circuit that will
only recognize or pass through the circuit the difference in the positive and negative
voltage applied to its input stage with respect to ground
Current can be defined as - ANSWER-the amount of electrons which flow past a
particular point
Ohm's Law predicts that - ANSWER-1. the flow of electrons through an element is
related to the internal resistance of that element
2. If one electrical property is changed (voltage, current, resistance, power) is changed,
the others will change in a predictable fashion.
3. If 1 volt of electrical pressure is put across 1 ohm of resistance it will generate 1
ampere of current resulting in 1 watt of power.
Resistance can be defined as - ANSWER-the opposition to the flow of electrons
Resistances or impedances that are wired in __________ (one after the other in the
connection) add, such that the total resistance/impedance is the sum of the individual
resistances - ANSWER-series
The total impedance presented by a device to current flowing from it and into another
device is known as - ANSWER-bridging impedances?
The total value of resistances or impedances of equal value that are wired in
__________ is the equal to the value of the individual resistance divided by the number
of resistances - ANSWER-parallel
, The voltage of the signal across the secondary windings of a transformer will be
proportional to the _____ ratio between the primary and secondary windings -
ANSWER-turns
This form of impedance has a greater opposition to high frequencies and less
opposition to low frequencies - ANSWER-inductance
This form of impedance has a less opposition to high frequencies and a greater
opposition to low frequencies - ANSWER-capacitance
This type of ground connection ties the AC safety ground wire from an electrical outlet
to a metal cold water pipe or some type if metal which is buried near the facility -
ANSWER-earth ground
Total Harmonic Distortion - ANSWER-a percentage of the output signal made up of all
distortion products
Transformers work by - ANSWER-transfer of energy by magnetic induction through the
core from its primary winding to its secondary winding
Voltage can be defined as - ANSWER-the pressure of the flow of electrons in a
conductor
Which type of signal transmission scheme interconnects equipment using input
impedances that are ten times greater than the output impedances - ANSWER-bridging
impdenaces
_____ is a property of impedance that causes the resistance of the AC circuit to
fluctuate based on frequency - ANSWER-reactance
A precise type of average level that correlates closely to the power inherent in a sound
wave and therefore to apparent loudness is - ANSWER-Root-Mean-Square
A result of 0 db means - ANSWER-there is no change in signal strength
A sound with a shorter duration may seem _____ than the same sound with the same
intensity that has a longer duration - ANSWER-softer
As overall sound intensity increases human hearing tends to - ANSWER-flatten out,
such that we are more equally sensitive to low, midrange, and high freq
At low to moderate levels humans hear _____ frequencies very poorly - ANSWER-low
Clipping occurs when the ______ of the input signal is too great for the device to handle
- ANSWER-amplitude
Answers
A _____ input physically isolates the circuitry that follows from induced currents in the
cable - ANSWER-transformer-isolated
A circuitry is considered balanced if the signal (+) and the return (-) - ANSWER-have
equal reference to the ground
A measure of the amount if energy generated or dissipated per unit of time, measured
in watts - ANSWER-power
A winding coil represents _____, which presenters lower opposition to low frequencies
and higher opposition to high frequencies - ANSWER-inductance
Common Mode Rejection - ANSWER-the characteristic of a balanced circuit that will
only recognize or pass through the circuit the difference in the positive and negative
voltage applied to its input stage with respect to ground
Current can be defined as - ANSWER-the amount of electrons which flow past a
particular point
Ohm's Law predicts that - ANSWER-1. the flow of electrons through an element is
related to the internal resistance of that element
2. If one electrical property is changed (voltage, current, resistance, power) is changed,
the others will change in a predictable fashion.
3. If 1 volt of electrical pressure is put across 1 ohm of resistance it will generate 1
ampere of current resulting in 1 watt of power.
Resistance can be defined as - ANSWER-the opposition to the flow of electrons
Resistances or impedances that are wired in __________ (one after the other in the
connection) add, such that the total resistance/impedance is the sum of the individual
resistances - ANSWER-series
The total impedance presented by a device to current flowing from it and into another
device is known as - ANSWER-bridging impedances?
The total value of resistances or impedances of equal value that are wired in
__________ is the equal to the value of the individual resistance divided by the number
of resistances - ANSWER-parallel
, The voltage of the signal across the secondary windings of a transformer will be
proportional to the _____ ratio between the primary and secondary windings -
ANSWER-turns
This form of impedance has a greater opposition to high frequencies and less
opposition to low frequencies - ANSWER-inductance
This form of impedance has a less opposition to high frequencies and a greater
opposition to low frequencies - ANSWER-capacitance
This type of ground connection ties the AC safety ground wire from an electrical outlet
to a metal cold water pipe or some type if metal which is buried near the facility -
ANSWER-earth ground
Total Harmonic Distortion - ANSWER-a percentage of the output signal made up of all
distortion products
Transformers work by - ANSWER-transfer of energy by magnetic induction through the
core from its primary winding to its secondary winding
Voltage can be defined as - ANSWER-the pressure of the flow of electrons in a
conductor
Which type of signal transmission scheme interconnects equipment using input
impedances that are ten times greater than the output impedances - ANSWER-bridging
impdenaces
_____ is a property of impedance that causes the resistance of the AC circuit to
fluctuate based on frequency - ANSWER-reactance
A precise type of average level that correlates closely to the power inherent in a sound
wave and therefore to apparent loudness is - ANSWER-Root-Mean-Square
A result of 0 db means - ANSWER-there is no change in signal strength
A sound with a shorter duration may seem _____ than the same sound with the same
intensity that has a longer duration - ANSWER-softer
As overall sound intensity increases human hearing tends to - ANSWER-flatten out,
such that we are more equally sensitive to low, midrange, and high freq
At low to moderate levels humans hear _____ frequencies very poorly - ANSWER-low
Clipping occurs when the ______ of the input signal is too great for the device to handle
- ANSWER-amplitude
