AT&T TKT II (Technical Knowledge Test II) — COMPREHENSIVE
FINAL EXAM Technical Knowledge Test II | 150 Questions with
Verified Answers and Detailed Rationales EXAM QUESTIONS AND
VERIFIED ANSWERS WITH DETAILED RATIONALES EACH |
CURRENTLY TESTING AND FREQUENTLY TESTED QUESTIONS |
TECHNICAL KNOWLEDGE TEST II EXAM PREP GRADED A+
The TKT II assesses technical knowledge required for technical positions at
AT&T. The exam covers five major categories:
SECTION 1: BASIC ELECTRICITY (Questions 1–50)
1. Which particle carries a negative electric charge?
A) Proton
B) Neutron
C) Electron
D) Positron
Answer: C) Electron
Rationale: Electrons have a charge of –1 coulomb, while protons are positive
and neutrons are neutral. This is a fundamental concept in electrical theory
and is essential for understanding current flow in circuits.
,2. The unit "Coulomb" (C) measures which of the following?**
A) Voltage
B) Current
C) Electric charge
D) Resistance
Answer: C) Electric charge
Rationale: A coulomb is the amount of electric charge transferred by a current
of one ampere in one second. The coulomb is the base unit of electrical charge
in the International System of Units (SI).
3. Conventional current flow is considered to move from:**
A) Negative to positive
B) Positive to negative
C) Low to high potential only in AC circuits
D) Electron flow direction
Answer: B) Positive to negative
Rationale: Conventional current is defined as flowing from the positive
terminal to the negative terminal, opposite to electron flow. This convention
was established before the discovery of electrons and is still used in circuit
analysis.
,4. In a direct-current (DC) circuit, the voltage is:
A) Constant in magnitude and direction
B) Varies sinusoidally with time
C) Alternates polarity every half-cycle
D) Zero at the source
Answer: A) Constant in magnitude and direction
Rationale: DC supplies maintain a steady voltage polarity and magnitude,
unlike AC which changes sinusoidally. This is a key distinction between DC and
AC circuits and is fundamental to understanding power systems.
5. Ohm's Law is expressed as:
A) V = I × R
B) P = V ÷ I
C) R = P × I
D) I = V² ÷ R
Answer: A) V = I × R
Rationale:Ohm's Law states that voltage (V) equals current (I) multiplied by
resistance (R). This is the most fundamental equation in electrical theory and
is used extensively in circuit analysis.
, 6. If a resistor has 12 V across it and 3 A flowing through it, what is its
resistance?
A) 4 Ω
B) 36 Ω
C) 0.25 Ω
D) 9 Ω
Answer: A) 4 Ω
Rationale: Using R = V/I = 12 V / 3 A = 4 Ω. This is a direct application of Ohm's
Law, which relates voltage, current, and resistance in a circuit.
7. Power dissipated in a resistor can be calculated with which formula?
A) P = V × I
B) P = I ÷ V
C) P = R ÷ I²
D) P = V ÷ R
Answer: A) P = V × I
Rationale: Power (P) equals voltage (V) multiplied by current (I). This formula
is derived from the combination of Ohm's Law and the definition of electrical
power. Other forms include P = I²R and P = V²/R.
8. Amperes is the unit for measuring:
A) Voltage
B) Resistance
C) Electrical current
FINAL EXAM Technical Knowledge Test II | 150 Questions with
Verified Answers and Detailed Rationales EXAM QUESTIONS AND
VERIFIED ANSWERS WITH DETAILED RATIONALES EACH |
CURRENTLY TESTING AND FREQUENTLY TESTED QUESTIONS |
TECHNICAL KNOWLEDGE TEST II EXAM PREP GRADED A+
The TKT II assesses technical knowledge required for technical positions at
AT&T. The exam covers five major categories:
SECTION 1: BASIC ELECTRICITY (Questions 1–50)
1. Which particle carries a negative electric charge?
A) Proton
B) Neutron
C) Electron
D) Positron
Answer: C) Electron
Rationale: Electrons have a charge of –1 coulomb, while protons are positive
and neutrons are neutral. This is a fundamental concept in electrical theory
and is essential for understanding current flow in circuits.
,2. The unit "Coulomb" (C) measures which of the following?**
A) Voltage
B) Current
C) Electric charge
D) Resistance
Answer: C) Electric charge
Rationale: A coulomb is the amount of electric charge transferred by a current
of one ampere in one second. The coulomb is the base unit of electrical charge
in the International System of Units (SI).
3. Conventional current flow is considered to move from:**
A) Negative to positive
B) Positive to negative
C) Low to high potential only in AC circuits
D) Electron flow direction
Answer: B) Positive to negative
Rationale: Conventional current is defined as flowing from the positive
terminal to the negative terminal, opposite to electron flow. This convention
was established before the discovery of electrons and is still used in circuit
analysis.
,4. In a direct-current (DC) circuit, the voltage is:
A) Constant in magnitude and direction
B) Varies sinusoidally with time
C) Alternates polarity every half-cycle
D) Zero at the source
Answer: A) Constant in magnitude and direction
Rationale: DC supplies maintain a steady voltage polarity and magnitude,
unlike AC which changes sinusoidally. This is a key distinction between DC and
AC circuits and is fundamental to understanding power systems.
5. Ohm's Law is expressed as:
A) V = I × R
B) P = V ÷ I
C) R = P × I
D) I = V² ÷ R
Answer: A) V = I × R
Rationale:Ohm's Law states that voltage (V) equals current (I) multiplied by
resistance (R). This is the most fundamental equation in electrical theory and
is used extensively in circuit analysis.
, 6. If a resistor has 12 V across it and 3 A flowing through it, what is its
resistance?
A) 4 Ω
B) 36 Ω
C) 0.25 Ω
D) 9 Ω
Answer: A) 4 Ω
Rationale: Using R = V/I = 12 V / 3 A = 4 Ω. This is a direct application of Ohm's
Law, which relates voltage, current, and resistance in a circuit.
7. Power dissipated in a resistor can be calculated with which formula?
A) P = V × I
B) P = I ÷ V
C) P = R ÷ I²
D) P = V ÷ R
Answer: A) P = V × I
Rationale: Power (P) equals voltage (V) multiplied by current (I). This formula
is derived from the combination of Ohm's Law and the definition of electrical
power. Other forms include P = I²R and P = V²/R.
8. Amperes is the unit for measuring:
A) Voltage
B) Resistance
C) Electrical current
