R_T_ 1 1R_1_ 1R_2_ 1R_3

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 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 1 / 4

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 ? .

• current

II. frequency III. inductance IV. resistance

• 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 2 / 4

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 3 / 4

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

=480 / 60

= 8 A 1Q29 Given a series circuit with one resistor (120 ohms) and one capacitor (80 ohms )

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