AT&T TKT II - EXAM ACCURATE REAL EXAM QUESTIONS AND VERIFIED
ANSWERS WITH DETAILED RATIONALES EACH | CURRENTLY TESTING
AND FREQUENTLY TESTED QUESTIONS | TECHNICAL KNOWLEDGE
TEST II EXAM PREP GRADED A+
SECTION 1: BASIC ELECTRICITY & ELECTRONICS (Questions 1 - 75)
Q1. What is the unit of measurement for electrical current?
A) Volt
B) Ohm
C) Ampere
D) Watt
**Correct Answer: C**
**Rationale:** The Ampere (amp) measures the rate of electron flow (current).
Volts measure pressure (EMF), Ohms measure resistance, and Watts measure
power consumption.
Q2. A Volt is fundamentally a measure of:
A) Electrical current
B) Electrical resistance
C) Electromotive force (potential difference)
D) Electrical power
**Correct Answer: C**
**Rationale:** The volt is the SI unit of electromotive force (EMF), which is the
electrical potential difference between two points in a circuit.
Q3. Which formula correctly represents Ohm's Law?
A) I = V * R
B) V = I / R
C) V = I * R
D) R = V * I
**Correct Answer: C**
1
,**Rationale:** Ohm's Law states that Voltage equals Current multiplied by
Resistance. The algebraic rearrangements are I=V/R and R=V/I.
Q4. What is the correct equation for electrical Power (Watt's Law)?
A) P = I^2 * R
B) P = V * I
C) P = V^2 / R
D) All of the above
**Correct Answer: D**
**Rationale:** All three are valid forms derived from Ohm's Law substitutions.
P=VI is the base form; P=I²R and P=V²/R are equivalent.
Q5. Which subatomic particle carries a negative charge?
A) Proton
B) Neutron
C) Electron
D) Positron
**Correct Answer: C**
**Rationale:** Electrons have a negative charge (-1). Protons are positive (+1),
neutrons are neutral (0), and positrons are antimatter electrons with positive
charge.
Q6. What is the direction of conventional current flow?
A) Negative to positive
B) Positive to negative
C) Alternating both directions
D) No directional flow
**Correct Answer: B**
**Rationale:** Conventional current assumes flow from positive to negative
terminal. Actual electron flow is opposite (negative to positive), but engineering
standards use conventional flow.
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,Q7. What type of current flows in only one direction?
A) Alternating Current (AC)
B) Direct Current (DC)
C) Pulsating DC
D) Bidirectional current
**Correct Answer: B**
**Rationale:** Direct Current (DC) maintains constant polarity and flows in a
single direction. AC reverses polarity periodically.
Q8. A capacitor primarily opposes changes in:
A) Current
B) Voltage
C) Resistance
D) Frequency
**Correct Answer: B**
**Rationale:** A capacitor stores energy in an electric field and resists sudden
voltage changes. Inductors resist changes in current.
Q9. An inductor primarily opposes changes in:
A) Voltage
B) Current
C) Power
D) Impedance
**Correct Answer: B**
**Rationale:** An inductor stores energy in a magnetic field and resists changes
in current flow through it.
Q10. What is the total resistance of two resistors (4Ω and 6Ω) connected in
series?
A) 2.4 Ω
B) 10 Ω
C) 24 Ω
3
, D) 1.5 Ω
**Correct Answer: B**
**Rationale:** Series resistances add directly: R_total = R1 + R2 = 4 + 6 = 10 Ω.
Q11. What is the total resistance of two resistors (4Ω and 6Ω) connected in
parallel?
A) 2.4 Ω
B) 10 Ω
C) 24 Ω
D) 1.5 Ω
**Correct Answer: A**
**Rationale:** Parallel resistance: 1/R_total = 1/4 + 1/6 = 5/12, so R_total = 12/5
= 2.4 Ω.
Q12. A circuit has 12V applied and draws 3A. What is the resistance?
A) 4 Ω
B) 36 Ω
C) 0.25 Ω
D) 15 Ω
**Correct Answer: A**
**Rationale:** R = V / I = = 4 Ω (Ohm's Law).
Q13. A 10Ω resistor has 5A flowing through it. What is the voltage drop?
A) 2 V
B) 15 V
C) 50 V
D) 0.5 V
**Correct Answer: C**
**Rationale:** V = I * R = 5 * 10 = 50 V.
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ANSWERS WITH DETAILED RATIONALES EACH | CURRENTLY TESTING
AND FREQUENTLY TESTED QUESTIONS | TECHNICAL KNOWLEDGE
TEST II EXAM PREP GRADED A+
SECTION 1: BASIC ELECTRICITY & ELECTRONICS (Questions 1 - 75)
Q1. What is the unit of measurement for electrical current?
A) Volt
B) Ohm
C) Ampere
D) Watt
**Correct Answer: C**
**Rationale:** The Ampere (amp) measures the rate of electron flow (current).
Volts measure pressure (EMF), Ohms measure resistance, and Watts measure
power consumption.
Q2. A Volt is fundamentally a measure of:
A) Electrical current
B) Electrical resistance
C) Electromotive force (potential difference)
D) Electrical power
**Correct Answer: C**
**Rationale:** The volt is the SI unit of electromotive force (EMF), which is the
electrical potential difference between two points in a circuit.
Q3. Which formula correctly represents Ohm's Law?
A) I = V * R
B) V = I / R
C) V = I * R
D) R = V * I
**Correct Answer: C**
1
,**Rationale:** Ohm's Law states that Voltage equals Current multiplied by
Resistance. The algebraic rearrangements are I=V/R and R=V/I.
Q4. What is the correct equation for electrical Power (Watt's Law)?
A) P = I^2 * R
B) P = V * I
C) P = V^2 / R
D) All of the above
**Correct Answer: D**
**Rationale:** All three are valid forms derived from Ohm's Law substitutions.
P=VI is the base form; P=I²R and P=V²/R are equivalent.
Q5. Which subatomic particle carries a negative charge?
A) Proton
B) Neutron
C) Electron
D) Positron
**Correct Answer: C**
**Rationale:** Electrons have a negative charge (-1). Protons are positive (+1),
neutrons are neutral (0), and positrons are antimatter electrons with positive
charge.
Q6. What is the direction of conventional current flow?
A) Negative to positive
B) Positive to negative
C) Alternating both directions
D) No directional flow
**Correct Answer: B**
**Rationale:** Conventional current assumes flow from positive to negative
terminal. Actual electron flow is opposite (negative to positive), but engineering
standards use conventional flow.
2
,Q7. What type of current flows in only one direction?
A) Alternating Current (AC)
B) Direct Current (DC)
C) Pulsating DC
D) Bidirectional current
**Correct Answer: B**
**Rationale:** Direct Current (DC) maintains constant polarity and flows in a
single direction. AC reverses polarity periodically.
Q8. A capacitor primarily opposes changes in:
A) Current
B) Voltage
C) Resistance
D) Frequency
**Correct Answer: B**
**Rationale:** A capacitor stores energy in an electric field and resists sudden
voltage changes. Inductors resist changes in current.
Q9. An inductor primarily opposes changes in:
A) Voltage
B) Current
C) Power
D) Impedance
**Correct Answer: B**
**Rationale:** An inductor stores energy in a magnetic field and resists changes
in current flow through it.
Q10. What is the total resistance of two resistors (4Ω and 6Ω) connected in
series?
A) 2.4 Ω
B) 10 Ω
C) 24 Ω
3
, D) 1.5 Ω
**Correct Answer: B**
**Rationale:** Series resistances add directly: R_total = R1 + R2 = 4 + 6 = 10 Ω.
Q11. What is the total resistance of two resistors (4Ω and 6Ω) connected in
parallel?
A) 2.4 Ω
B) 10 Ω
C) 24 Ω
D) 1.5 Ω
**Correct Answer: A**
**Rationale:** Parallel resistance: 1/R_total = 1/4 + 1/6 = 5/12, so R_total = 12/5
= 2.4 Ω.
Q12. A circuit has 12V applied and draws 3A. What is the resistance?
A) 4 Ω
B) 36 Ω
C) 0.25 Ω
D) 15 Ω
**Correct Answer: A**
**Rationale:** R = V / I = = 4 Ω (Ohm's Law).
Q13. A 10Ω resistor has 5A flowing through it. What is the voltage drop?
A) 2 V
B) 15 V
C) 50 V
D) 0.5 V
**Correct Answer: C**
**Rationale:** V = I * R = 5 * 10 = 50 V.
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