NCATT AET EXAM QUESTIONS WITH
CORRECT DETAILED ANSWERS
(GRADED A+)
When an AC voltage is applied to the primary coil it creates a - Answer-magnetic flux in
the core, which induces AC voltage in the secondary coil in phase wit the source
voltage
Capacitive Reactance - Answer-is the capacitiors opposition to change in the AC
voltage
The symbol capacitive reactance is - Answer-an X with a c subscript
Capacitive reactance is inversely proportional - Answer-to both frequency and
capacitance
If the frequency increases then - Answer-capacitve reactance will decrease
If the capacitance increases then - Answer-the capacitive reactance will decrease
Total capacitance reactance in a series circuit - Answer-is determined by adding the
values of the of the individual capacitve reactances together
Total capacitance reactance in a parallel circuit is found by - Answer-adding the inverse
sums, product over methor or the value divided by the sum of branches
Capacitance reactance is measured as - Answer-resistance to current flow
The resistance that is produced by the capacitors and the inductor are called - Answer-
reactance which is impedance to current flow
If a vector value is 0 - Answer-then the vector is considered to be in phase
180 degrees is the most that - Answer-any vector can be out of phase
In ELI the ICE man, ICE is - Answer-the relationship of Current (I) as being in front of of
leading Voltage (E) for the capacitor (C)
Impeadance is symbolized by the letter - Answer-Z
Impeadance is - Answer-the total opposition of a circuit to alternating current
,What determines whether the vector is positive or negative is - Answer-determined if the
circuit is more capacitate reactant or inductive reactant
Voltage is common - Answer-in a parallel circuit
If asked to determine impedance in a parallel cuircuit, you will need to determine -
Answer-the total current in the circuit
Resonance - Answer-a condition where the capacitive and inductive reactance of an LC
circuit are equal
RCL circuits are - Answer-the basis for the operation of tank circuits inside oscillators
Resonance operation refers to - Answer-the relationship between the total current of a
circuit as compared to the total impedance
A parallel RCL circuit is operating in resonance when - Answer-the total impedance is
maximum and the total current is at a minimum
Half-power points, bandwidth, bandpass, and circuit quality - Answer-can only exist in a
circuit operating at one resonance frequency
Bandwidth is established between - Answer-the upper half power point and the lower
half power point
Power points are at - Answer-70.7% of peak power
Bandwidth is - Answer-the frequency difference between the upper and lower half
power points
Bandpass is expressed as a - Answer-a range of the powerpoints between high and low
Circuit impedance is symbolized as - Answer-Z with Hpp subscript
Impedance half power points - Answer-are the two points on the impedance curve that
are 70.7% of the peak impedance value
A parallel circuit is at resonance with - Answer-the impedance is at maximum and the
current is at a minimum
Q in a circuit is - Answer-a description of the quality of the circuit
Q is a ratio of the - Answer-bandwidth to the peak current curve
Q and the bandwidth are - Answer-inversely proportional
, Circuits with a high Q - Answer-will have a narrow bandwidth
Circuits with a low Q - Answer-will have a wide bandwidth
Circuit quality equation - Answer-inductive reactance divided by resistance
The voltage of a capacitor in a parallel RCL circuit - Answer-is equal to the voltage at
the inductor
Since the capacitor and inductor are matched value wise in a parallel RCL circuit -
Answer-the impedance would be the same
The heart of an oscillator - Answer-tank circuit
Oscillator - Answer-what produces the carrier wave in most radios
Physically a tank circuit is - Answer-one inductor and one capacitor wired in parallel
Tank cirucits store energy - Answer-temporarily
Flywheel effect - Answer-the flowing of current between a capacitor and inductor in a
tank circuit
Tank circuits have how many frequencies that they will oscillate at - Answer-one
At resonance, a tank circuit will operate as - Answer-one component
No other current will flow as long as a circuit is - Answer-oscillating
Frequency is determined by - Answer-the capacitor and inductor of the circuit
Resonance frequency is equal to - Answer-the product of one half pi the square root of
the value of the inductor times the capacitor
Dampening wave - Answer-Each cycle of a tank circuit a little bit of energy is lost so
over time the amplitude of the sine wave will steadily decrease
Regenerative feedback - Answer-the injection of the right amount of energy into the
circuit to maintain the amplitude
Transformer - Answer-transforms electrical energy into magnetic energy then back into
electrical energy again
Transformer operation depends on - Answer-electromagnetic induction between two
stationary coils and a magnetic flux of changing magnitude and polarity
CORRECT DETAILED ANSWERS
(GRADED A+)
When an AC voltage is applied to the primary coil it creates a - Answer-magnetic flux in
the core, which induces AC voltage in the secondary coil in phase wit the source
voltage
Capacitive Reactance - Answer-is the capacitiors opposition to change in the AC
voltage
The symbol capacitive reactance is - Answer-an X with a c subscript
Capacitive reactance is inversely proportional - Answer-to both frequency and
capacitance
If the frequency increases then - Answer-capacitve reactance will decrease
If the capacitance increases then - Answer-the capacitive reactance will decrease
Total capacitance reactance in a series circuit - Answer-is determined by adding the
values of the of the individual capacitve reactances together
Total capacitance reactance in a parallel circuit is found by - Answer-adding the inverse
sums, product over methor or the value divided by the sum of branches
Capacitance reactance is measured as - Answer-resistance to current flow
The resistance that is produced by the capacitors and the inductor are called - Answer-
reactance which is impedance to current flow
If a vector value is 0 - Answer-then the vector is considered to be in phase
180 degrees is the most that - Answer-any vector can be out of phase
In ELI the ICE man, ICE is - Answer-the relationship of Current (I) as being in front of of
leading Voltage (E) for the capacitor (C)
Impeadance is symbolized by the letter - Answer-Z
Impeadance is - Answer-the total opposition of a circuit to alternating current
,What determines whether the vector is positive or negative is - Answer-determined if the
circuit is more capacitate reactant or inductive reactant
Voltage is common - Answer-in a parallel circuit
If asked to determine impedance in a parallel cuircuit, you will need to determine -
Answer-the total current in the circuit
Resonance - Answer-a condition where the capacitive and inductive reactance of an LC
circuit are equal
RCL circuits are - Answer-the basis for the operation of tank circuits inside oscillators
Resonance operation refers to - Answer-the relationship between the total current of a
circuit as compared to the total impedance
A parallel RCL circuit is operating in resonance when - Answer-the total impedance is
maximum and the total current is at a minimum
Half-power points, bandwidth, bandpass, and circuit quality - Answer-can only exist in a
circuit operating at one resonance frequency
Bandwidth is established between - Answer-the upper half power point and the lower
half power point
Power points are at - Answer-70.7% of peak power
Bandwidth is - Answer-the frequency difference between the upper and lower half
power points
Bandpass is expressed as a - Answer-a range of the powerpoints between high and low
Circuit impedance is symbolized as - Answer-Z with Hpp subscript
Impedance half power points - Answer-are the two points on the impedance curve that
are 70.7% of the peak impedance value
A parallel circuit is at resonance with - Answer-the impedance is at maximum and the
current is at a minimum
Q in a circuit is - Answer-a description of the quality of the circuit
Q is a ratio of the - Answer-bandwidth to the peak current curve
Q and the bandwidth are - Answer-inversely proportional
, Circuits with a high Q - Answer-will have a narrow bandwidth
Circuits with a low Q - Answer-will have a wide bandwidth
Circuit quality equation - Answer-inductive reactance divided by resistance
The voltage of a capacitor in a parallel RCL circuit - Answer-is equal to the voltage at
the inductor
Since the capacitor and inductor are matched value wise in a parallel RCL circuit -
Answer-the impedance would be the same
The heart of an oscillator - Answer-tank circuit
Oscillator - Answer-what produces the carrier wave in most radios
Physically a tank circuit is - Answer-one inductor and one capacitor wired in parallel
Tank cirucits store energy - Answer-temporarily
Flywheel effect - Answer-the flowing of current between a capacitor and inductor in a
tank circuit
Tank circuits have how many frequencies that they will oscillate at - Answer-one
At resonance, a tank circuit will operate as - Answer-one component
No other current will flow as long as a circuit is - Answer-oscillating
Frequency is determined by - Answer-the capacitor and inductor of the circuit
Resonance frequency is equal to - Answer-the product of one half pi the square root of
the value of the inductor times the capacitor
Dampening wave - Answer-Each cycle of a tank circuit a little bit of energy is lost so
over time the amplitude of the sine wave will steadily decrease
Regenerative feedback - Answer-the injection of the right amount of energy into the
circuit to maintain the amplitude
Transformer - Answer-transforms electrical energy into magnetic energy then back into
electrical energy again
Transformer operation depends on - Answer-electromagnetic induction between two
stationary coils and a magnetic flux of changing magnitude and polarity
