NCATT AET MAIN EXAMINATION 2026 SET QUESTIONS
AND ANSWERS SCORED A+
✔✔Oscilloscope - ✔✔used to display changing voltage over time on a graphical screen
✔✔ECG - ✔✔special purpose oscilloscope expressly designed for medical use
✔✔General purpose oscilloscope - ✔✔have the ability to display voltage from virtually
any voltage source plotted as a graph with time as the independent variable
✔✔You can determine the frequency in Hertz - ✔✔by measuring the period on the wave
on the horizontal axis of the oscilloscope screen and reciprocating that time value in
seconds
✔✔Provides an excellent analogy for relating AC concepts - ✔✔sound waves,
especially music
✔✔Frequency is equivalent to - ✔✔pitch
✔✔Pure waves - ✔✔Square, triangle, or saw tooth voltage/current wave forms that real
life often distorts
✔✔Nonsinusodial wave - ✔✔waveshape that does not bear a close resemblance to a
perfect sine wave
✔✔The devices in a circuit - ✔✔are the source for each type of wave
✔✔A square wave could be produced by - ✔✔a transitor acting as a switch
✔✔A sawtooth wave could be produced by - ✔✔capacitors or inductors
✔✔The rate of alternation - ✔✔the time it takes for a wave to evolve before it repeats
itself expressed as cycles per unit time or frequency
✔✔Peak or Crest value of an AC waveform - ✔✔the measure of AC quantity from its
peak heigh on a waveform graph
✔✔Peak to Peak (P-P) - ✔✔value of an AC waveform measured from the total height of
opposite peaks
✔✔Average value of a waveform - ✔✔average the values of all the points on a
waveform's graph to a single aggregate number mathematically
✔✔Practical average of points means - ✔✔all values assumed to be positive
,✔✔DC equivalent and equivalent are sometimes used - ✔✔in place of RMS
✔✔When dealing with measurements of electric power, RMS amplitude measurement -
✔✔is the best way to relate AC quantities to DC quantities
✔✔RMS current measurement is the best to use because - ✔✔the principal concern
with current is overheating of the wire which is a function of power dissipation caused by
current through the resistance of the wire
✔✔When rating insulators for service in high voltage AC applications - ✔✔peak voltage
measurements are the most appropriate because the principal concern here is insulator
flash over
✔✔Flashover - ✔✔caused by brief spikes of voltage irrespective of time
✔✔An oscilloscope is the best way to - ✔✔perform peak and peak to peak
measurements
✔✔The reason oscilloscopes are so accurate in capturing the crests of the waveform -
✔✔The fast action of the cathode ray tube in response to changes in voltage
✔✔Analog meter movements will work for RMS measurements so long as they have -
✔✔been calibrated for RMS figures
✔✔Electronic meters specifically designed for RMS measurement - ✔✔are best for
measuring RMS
✔✔Simple circuits involving nothing more than AC power source and resistance -
✔✔the same laws and rules of DC apply simply and directly
✔✔Purely restive circuits - ✔✔the complexities of AC are of no practical consequence
✔✔If source voltage is given in peak AC volts - ✔✔then all currents and voltages are
subsequently calculated regarding peak units
✔✔If source voltage is given in AC RMS volts - ✔✔then all calculated currents and
voltages are cast in AC RMS units as well
✔✔Out of step - ✔✔two waveforms are not synchronized
✔✔RCL stands for - ✔✔Resistor, Capacitor, and Inductor
, ✔✔RCL computations are used - ✔✔to understand how AC voltage reacts to the
various types of components
✔✔Each component produces - ✔✔impedance in the circuit that is a resistance to
current flow
✔✔Capacitance is the opposite of - ✔✔inductance
✔✔Inductance is the opposite of - ✔✔Capacitance
✔✔Rules for calculating resistors in an AC circuit - ✔✔is the same as DC
✔✔In a DC circuit, an inductor is - ✔✔a simple coil of wire
✔✔Henrys only describe - ✔✔the value of the inductor and not the impedance the
device contributes to the circuit
✔✔Impedance and Inductance reactance caused by inductors in an AC circuit is
referred to in - ✔✔Ohms
✔✔A Magnetic Field is built when - ✔✔current first starts flowing through a coil
✔✔Stores energy - ✔✔An instructor's magnetic field does this
✔✔Inductors resist - ✔✔the flow of electrons
✔✔Four factors that control capacity of an inductor - ✔✔Number of coils, material of the
coils wrapped around the core, cross sectional area of the coil, and the length of the coil
✔✔Henries = (4 x PI x #turns x #turns x Coil Area x MU)/ (coil length x 10,000,000) -
✔✔equation for calculating the number of heneries in an inductor is
✔✔Symbol for capacitor - ✔✔two parallel lines
✔✔A capacitor is like - ✔✔a little battery
✔✔Batteries and capacitors both - ✔✔store electrons
✔✔Chemical reactions - ✔✔a batteries method of producing electrons on one terminal
and absorbing elections on the other terminal
✔✔Only stores electrons - ✔✔Capacitors can't produce electrons, instead they
AND ANSWERS SCORED A+
✔✔Oscilloscope - ✔✔used to display changing voltage over time on a graphical screen
✔✔ECG - ✔✔special purpose oscilloscope expressly designed for medical use
✔✔General purpose oscilloscope - ✔✔have the ability to display voltage from virtually
any voltage source plotted as a graph with time as the independent variable
✔✔You can determine the frequency in Hertz - ✔✔by measuring the period on the wave
on the horizontal axis of the oscilloscope screen and reciprocating that time value in
seconds
✔✔Provides an excellent analogy for relating AC concepts - ✔✔sound waves,
especially music
✔✔Frequency is equivalent to - ✔✔pitch
✔✔Pure waves - ✔✔Square, triangle, or saw tooth voltage/current wave forms that real
life often distorts
✔✔Nonsinusodial wave - ✔✔waveshape that does not bear a close resemblance to a
perfect sine wave
✔✔The devices in a circuit - ✔✔are the source for each type of wave
✔✔A square wave could be produced by - ✔✔a transitor acting as a switch
✔✔A sawtooth wave could be produced by - ✔✔capacitors or inductors
✔✔The rate of alternation - ✔✔the time it takes for a wave to evolve before it repeats
itself expressed as cycles per unit time or frequency
✔✔Peak or Crest value of an AC waveform - ✔✔the measure of AC quantity from its
peak heigh on a waveform graph
✔✔Peak to Peak (P-P) - ✔✔value of an AC waveform measured from the total height of
opposite peaks
✔✔Average value of a waveform - ✔✔average the values of all the points on a
waveform's graph to a single aggregate number mathematically
✔✔Practical average of points means - ✔✔all values assumed to be positive
,✔✔DC equivalent and equivalent are sometimes used - ✔✔in place of RMS
✔✔When dealing with measurements of electric power, RMS amplitude measurement -
✔✔is the best way to relate AC quantities to DC quantities
✔✔RMS current measurement is the best to use because - ✔✔the principal concern
with current is overheating of the wire which is a function of power dissipation caused by
current through the resistance of the wire
✔✔When rating insulators for service in high voltage AC applications - ✔✔peak voltage
measurements are the most appropriate because the principal concern here is insulator
flash over
✔✔Flashover - ✔✔caused by brief spikes of voltage irrespective of time
✔✔An oscilloscope is the best way to - ✔✔perform peak and peak to peak
measurements
✔✔The reason oscilloscopes are so accurate in capturing the crests of the waveform -
✔✔The fast action of the cathode ray tube in response to changes in voltage
✔✔Analog meter movements will work for RMS measurements so long as they have -
✔✔been calibrated for RMS figures
✔✔Electronic meters specifically designed for RMS measurement - ✔✔are best for
measuring RMS
✔✔Simple circuits involving nothing more than AC power source and resistance -
✔✔the same laws and rules of DC apply simply and directly
✔✔Purely restive circuits - ✔✔the complexities of AC are of no practical consequence
✔✔If source voltage is given in peak AC volts - ✔✔then all currents and voltages are
subsequently calculated regarding peak units
✔✔If source voltage is given in AC RMS volts - ✔✔then all calculated currents and
voltages are cast in AC RMS units as well
✔✔Out of step - ✔✔two waveforms are not synchronized
✔✔RCL stands for - ✔✔Resistor, Capacitor, and Inductor
, ✔✔RCL computations are used - ✔✔to understand how AC voltage reacts to the
various types of components
✔✔Each component produces - ✔✔impedance in the circuit that is a resistance to
current flow
✔✔Capacitance is the opposite of - ✔✔inductance
✔✔Inductance is the opposite of - ✔✔Capacitance
✔✔Rules for calculating resistors in an AC circuit - ✔✔is the same as DC
✔✔In a DC circuit, an inductor is - ✔✔a simple coil of wire
✔✔Henrys only describe - ✔✔the value of the inductor and not the impedance the
device contributes to the circuit
✔✔Impedance and Inductance reactance caused by inductors in an AC circuit is
referred to in - ✔✔Ohms
✔✔A Magnetic Field is built when - ✔✔current first starts flowing through a coil
✔✔Stores energy - ✔✔An instructor's magnetic field does this
✔✔Inductors resist - ✔✔the flow of electrons
✔✔Four factors that control capacity of an inductor - ✔✔Number of coils, material of the
coils wrapped around the core, cross sectional area of the coil, and the length of the coil
✔✔Henries = (4 x PI x #turns x #turns x Coil Area x MU)/ (coil length x 10,000,000) -
✔✔equation for calculating the number of heneries in an inductor is
✔✔Symbol for capacitor - ✔✔two parallel lines
✔✔A capacitor is like - ✔✔a little battery
✔✔Batteries and capacitors both - ✔✔store electrons
✔✔Chemical reactions - ✔✔a batteries method of producing electrons on one terminal
and absorbing elections on the other terminal
✔✔Only stores electrons - ✔✔Capacitors can't produce electrons, instead they
