ACL2 Exam Questions with 100% Verified Correct Answers
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Course
ACL2
Institution
ACL2
ACL2 Exam Questions with 100% Verified Correct Answers
R_T_ = 1 / ( (1/R_1_) + (1/R_2_) + (1/R_3) )
1Q1
Which is the correct formula for determining total resistance in a circuit containing three resistors in series? - Correct Answer R_T_ = R_1_ + R_2_ + R_3_
1Q2
Which is the correct formu...
Which is the correct formula for determining total resistance in a circuit containing three resistors in
series? - Correct Answer R_T_ = R_1_ + R_2_ + R_3_
1Q2
Which is the correct formula for determining total inductance in a circuit containing three inductors
in series? - Correct Answer L_T_ = L_1_ + L_2_ + L_3_
1Q3
What is the equation to find inductive resistance? - Correct Answer X_L_ = 2 * pi * f * L
1Q4
Refer to the formula XL = 2πfL. If L increases, XL ? , and if f increases, XL ? . - Correct Answer increases
/ increases
1Q5
True or False
Coils do not have resistance. - Correct Answer False Note:
Coils are wound of wire, and all wire has some resistance.
The correct answer is 'False'.
1Q6
The ratio of a coil's inductive reactance to resistance (X_L_ / R) is referred to as the coil's ? whose
symbol is ? . - Correct Answer quality factor / Q
1Q7
In a circuit containing only inductance (if this is possible), what is the phase relationship between the
current and the applied voltage? - Correct Answer 90° out-of-phase, lagging
1Q8
,If a circuit contains ? , the current and the applied voltage will always be in-phase. - Correct Answer
only resistance
1Q9
What is meant by the statement that the circuit is a RL circuit? - Correct Answer The circuit contains
inductive reactance and resistance
1Q10
Inductive reactance of a circuit is directly proportional to ? .
I. current
II. frequency
III. inductance
IV. resistance
V. voltage - Correct Answer II % III
1Q11
Both resistance and inductive reactance oppose current flow, and their combined opposition is called
? . - Correct Answer impedance
1Q12
Inductive reactance is measured in ? and is designated by ? . - Correct Answer ohms/ XL
1Q13
Resistance is measured in ? and is designated by ? . - Correct Answer ohms / R
1Q13
Impedance is measured in ? and is designated by ? . - Correct Answer ohms / Z
1Q13
True or false
,To find the total impedance for a series RL circuit, vector addition must be used. - Correct Answer
True
1Q14
True or False
Using the impedance triangle is just one method of graphically showing how out-of-phase quantities
can be added. - Correct Answer True
Note: The triangle method only works for quantities that are 90° out-of-phase.
1Q15
One of the primary laws for series circuits is that the ? must be the same in any part of the circuit. -
Correct Answer current
1Q17
The voltage drop across a resistor in a circuit can be determined by the formula ?. - Correct Answer
E_R_ = I_R_ * R
1Q18
The voltage drop across an inductor in a circuit can be determined by the formula - Correct Answer
E_L_ = I_L_ * X_L_
1Q18
In this series circuit, the voltage drop across the resistor is 130 volts, and the applied voltage is 150
volts. What is the voltage drop across the coil? (Round the FINAL answer to one decimal place.) -
Correct Answer 74.8 V note:
E_app_ = sqrt ( E_R_^2 + E_L_^2)
E_L_ = sqrt ( E_app_^2 - E_R_^2)
= sqrt (150^2 - 130^2 )
=q1974.8 V
1Q19
VARs represents the product of the volts and amps that are ? out-of-phase with each other. - Correct
Answer 90 degrees
1Q21
, The power factor (PF) is a ratio of the ? power to ? power. - Correct Answer true / apparent
1Q22
Power factor is generally expressed as a(n) ? . - Correct Answer percentage
1Q23
What is the power factor equation? - Correct Answer PF = (P_true_ / P_app_) * 100
1Q24
The angular displacement by which the voltage and current are out-of-phase with each other is
referred to as ? . - Correct Answer the angle theta
1Q25
The ? of the angle theta (∠θ) in a power triangle is also the power factor. - Correct Answer cosine
1Q26
When R and XL are present in a circuit, theta is somewhere between ? and ? . - Correct Answer 0
degrees / 90 degrees
1Q27
More resistance in a RL series circuit causes the vertical component of an impedance triangle to
become relatively ? with a ? phase angle. - Correct Answer shorter / smaller
1Q28
A 480-volt circuit has an impedance of 60 ohms. What is the current? - Correct Answer 8 A
I=E/Z
=
=8A
1Q29
Given a series circuit with one resistor (120 ohms) and one capacitor (80 ohms )
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