ELECTRONICS ETA AC CERTIFICATION PRACTICE EXAM 2025 QUESTIONS WITH ACTUAL
PASSED SOLUTIONS!!
In alternating current: A. current flow alternates back and forth B. voltage alternates positive and
negative C. resistance changes between high and low D. A and B above - (answer)D. A and B above
Historically, DC came before AC because: A. DC is more useful B. DC is easier to transmit over long
distances C. AC requires more advanced technology D. AC is less efficient - (answer)C. AC requires more
advanced technology
An AC voltage source schematic symbol: A. is a sine wave in a circle B. represents an idealized voltage
source C. is considered to have zero internal resistance D. all of the above - (answer)D. all of the above
The opposition to current flow presented by capacitors and inductors is called: A. Resistance B.
Reactance C. Impedance D. Reluctance - (answer)D. Reluctance
Impedance is: A. any combination of resistance and reactance B. another name for resistance C. another
name for reactance D. measured in watt-hours - (answer)A. any combination of resistance and
reactance
AC voltage, current, resistance and power are often indicated by: A. lower-case letters B. smaller-type
letters C. Greek symbols D. letters in parentheses - (answer)A. lower-case letters
The quadrants in a 4-quadrant X-Y graph are: A. 1, 2, 3, 4, clockwise from upper right B. A, B, C, D,
clockwise from upper left C. I, II, III, IV, counter-clockwise from upper left D. I, II, III, IV, counter-
clockwise from upper right - (answer)D. I, II, III, IV, counter-clockwise from upper right
A phasor is: A. an arrow with a specific magnitude and direction B. often used to represent voltage or
current C. considered to be rotating counter-clockwise D. all of the above - (answer)D. all of the above
In a right triangle: A. all the internal angles add up to 90O B. one internal angle is 90O C. all the internal
angles are the same D. every internal angle is 90O - (answer)D. every internal angle is 90*
, ELECTRONICS ETA AC CERTIFICATION PRACTICE EXAM 2025 QUESTIONS WITH ACTUAL
PASSED SOLUTIONS!!
In the illustration at right, the Opposite, Adjacent and Hypotenuse are, respectively: A. 3,2,1 B. 3,1,2 C.
2,3,1 D. 2,1,3 - (answer)A. 3,2,1
The sine, cosine and tangent of a right triangle are, respectively: A. Op / Adj, Adj / Op, Hyp / Adj B. Op /
Hyp, Adj / Hyp, Op / Adj C. Adj / Op, Adj / Hyp, Op / Hyp D. Hyp / Op, Hyp/ Adj, Op / Adj - (answer)B. Op
/ Hyp, Adj / Hyp, Op / Adj
π is approximately: A. 0.707 B. 6.3 C. 3.14 D. 3.142 - (answer)C. 3.14
The circumference of a circle is: A. π x radius squared B. π x radius C. π x diameter D. π / diameter -
(answer)C. π x diameter
A radian: A. is the same length as a radius B. if multiplied by 2π, equal to circumference C. the same
length as a diameter D. A and B above - (answer)D. A and B above
Angular velocity is: A. the speed of a phasor tip B. the Greek letter ω C. π times frequency D. all of
the above - (answer)D. all of the above
An imaginary number corresponds to: A. a point on the X-axis to the left of the origin B. a point in
quadrant III C. a point on the Y-axis D. a point in quadrant IV - (answer)C. a point on the Y-axis
Translate angular coordinates 3, 45* to X,Y coordinates. Truncate to two places. A. 0.71, j0.71 B. 2.12,
j2.12 C. 4.2, j4.2 D. 4.2, -j4.2 - (answer)B. 2.12, j2.12
On a log scale, the physical space between 1 and 1.5 is the same as the space between: A. 2 and 4.5 B. 3
and 6 C. 4 and 6.5 D. 5 and 7.5 - (answer)D. 5 and 7.5
A periodic waveform is: A. one which has no distortion B. one which continuously repeats C. one with
symmetrical + and - alternations D. a wave that turns on and off e.g. telegraph - (answer)A. one which
has no distortion
PASSED SOLUTIONS!!
In alternating current: A. current flow alternates back and forth B. voltage alternates positive and
negative C. resistance changes between high and low D. A and B above - (answer)D. A and B above
Historically, DC came before AC because: A. DC is more useful B. DC is easier to transmit over long
distances C. AC requires more advanced technology D. AC is less efficient - (answer)C. AC requires more
advanced technology
An AC voltage source schematic symbol: A. is a sine wave in a circle B. represents an idealized voltage
source C. is considered to have zero internal resistance D. all of the above - (answer)D. all of the above
The opposition to current flow presented by capacitors and inductors is called: A. Resistance B.
Reactance C. Impedance D. Reluctance - (answer)D. Reluctance
Impedance is: A. any combination of resistance and reactance B. another name for resistance C. another
name for reactance D. measured in watt-hours - (answer)A. any combination of resistance and
reactance
AC voltage, current, resistance and power are often indicated by: A. lower-case letters B. smaller-type
letters C. Greek symbols D. letters in parentheses - (answer)A. lower-case letters
The quadrants in a 4-quadrant X-Y graph are: A. 1, 2, 3, 4, clockwise from upper right B. A, B, C, D,
clockwise from upper left C. I, II, III, IV, counter-clockwise from upper left D. I, II, III, IV, counter-
clockwise from upper right - (answer)D. I, II, III, IV, counter-clockwise from upper right
A phasor is: A. an arrow with a specific magnitude and direction B. often used to represent voltage or
current C. considered to be rotating counter-clockwise D. all of the above - (answer)D. all of the above
In a right triangle: A. all the internal angles add up to 90O B. one internal angle is 90O C. all the internal
angles are the same D. every internal angle is 90O - (answer)D. every internal angle is 90*
, ELECTRONICS ETA AC CERTIFICATION PRACTICE EXAM 2025 QUESTIONS WITH ACTUAL
PASSED SOLUTIONS!!
In the illustration at right, the Opposite, Adjacent and Hypotenuse are, respectively: A. 3,2,1 B. 3,1,2 C.
2,3,1 D. 2,1,3 - (answer)A. 3,2,1
The sine, cosine and tangent of a right triangle are, respectively: A. Op / Adj, Adj / Op, Hyp / Adj B. Op /
Hyp, Adj / Hyp, Op / Adj C. Adj / Op, Adj / Hyp, Op / Hyp D. Hyp / Op, Hyp/ Adj, Op / Adj - (answer)B. Op
/ Hyp, Adj / Hyp, Op / Adj
π is approximately: A. 0.707 B. 6.3 C. 3.14 D. 3.142 - (answer)C. 3.14
The circumference of a circle is: A. π x radius squared B. π x radius C. π x diameter D. π / diameter -
(answer)C. π x diameter
A radian: A. is the same length as a radius B. if multiplied by 2π, equal to circumference C. the same
length as a diameter D. A and B above - (answer)D. A and B above
Angular velocity is: A. the speed of a phasor tip B. the Greek letter ω C. π times frequency D. all of
the above - (answer)D. all of the above
An imaginary number corresponds to: A. a point on the X-axis to the left of the origin B. a point in
quadrant III C. a point on the Y-axis D. a point in quadrant IV - (answer)C. a point on the Y-axis
Translate angular coordinates 3, 45* to X,Y coordinates. Truncate to two places. A. 0.71, j0.71 B. 2.12,
j2.12 C. 4.2, j4.2 D. 4.2, -j4.2 - (answer)B. 2.12, j2.12
On a log scale, the physical space between 1 and 1.5 is the same as the space between: A. 2 and 4.5 B. 3
and 6 C. 4 and 6.5 D. 5 and 7.5 - (answer)D. 5 and 7.5
A periodic waveform is: A. one which has no distortion B. one which continuously repeats C. one with
symmetrical + and - alternations D. a wave that turns on and off e.g. telegraph - (answer)A. one which
has no distortion
