Electronics ETA AC Certification Practice
Exam UPDATED QUESTIONS AND
CORRECT ANSWERS
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 - CORRECT
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 -
CORRECT 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 -
CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT 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 -
CORRECT 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 - CORRECT
ANSWER D. every internal angle is 90*
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 - CORRECT 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 - CORRECT ANSWER B. Op / Hyp, Adj / Hyp, Op / Adj
π is approximately: A. 0.707 B. 6.3 C. 3.14 D. 3.142 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT ANSWER B. 2.12, j2.12
Exam UPDATED QUESTIONS AND
CORRECT ANSWERS
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 - CORRECT
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 -
CORRECT 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 -
CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT 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 -
CORRECT 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 - CORRECT
ANSWER D. every internal angle is 90*
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 - CORRECT 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 - CORRECT ANSWER B. Op / Hyp, Adj / Hyp, Op / Adj
π is approximately: A. 0.707 B. 6.3 C. 3.14 D. 3.142 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT ANSWER B. 2.12, j2.12
