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CWEA Electrical Instrumentation Technologist Grade 2
Exam–QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
CWEA Electrical/Instrumentation Technologist Grade 2 Exam
Below is a comprehensive study guide for the CWEA Electrical/Instrumentation Technologist Grade 2
Exam,. Content is based on the official CWEA exam matrix, California Code of Regulations, NFPA 70,
NFPA 70E, and standard industrial E&I practices.
Section 1: Electrical Theory & Calculations (Questions 1-40)
1. What is the total resistance of three 30-ohm resistors connected in parallel?
A) 10 ohms
B) 30 ohms
C) 60 ohms
D) 90 ohms
Answer: A) 10 ohms
Rationale: For parallel resistors of equal value, the total resistance is the value of one resistor divided by
the number of resistors (R_total = R/n). Therefore, 30 ohms ÷ 3 = 10 ohms .
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2. According to Kirchhoff's Current Law, the sum of currents entering a node is:
A) Equal to the sum of currents leaving the node
B) Equal to zero only if voltages are balanced
C) Greater than the sum of currents leaving
D) Less than the sum of currents leaving
Answer: A) Equal to the sum of currents leaving the node
Rationale: Kirchhoff's Current Law (KCL) states that the algebraic sum of all currents entering and
leaving a node is zero, meaning the sum of currents entering equals the sum of currents leaving .
3. In a balanced three-phase wye system, the line voltage is how many times the phase voltage?
A) √3 (approximately 1.73)
B) 1/√3 (approximately 0.577)
C) Equal to the phase voltage
D) √2 (approximately 1.414)
Answer: A) √3 (approximately 1.73)
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Rationale: In a wye (star) connection, the line voltage is √3 times the phase voltage (V_line = √3 ×
V_phase). This is because the line voltage is the vector sum of two phase voltages separated by 120
degrees .
4. True power (P) in an AC circuit is measured in which unit?
A) VARs
B) VA
C) Watts
D) Volts
Answer: C) Watts
Rationale: True (real) power is the actual work-producing component of electrical power and is
expressed in watts (W). Apparent power is measured in volt-amps (VA), and reactive power is measured
in VARs .
5. A circuit has a voltage of 120V and a resistance of 12 ohms. What is the current according to Ohm's
Law?
A) 1 amp
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B) 10 amps
C) 12 amps
D) 120 amps
Answer: B) 10 amps
Rationale: According to Ohm's Law, current (I) = voltage (V) divided by resistance (R). Therefore, I =
120V ÷ 12Ω = 10 amperes .
6. What is the binary equivalent of the decimal number 10?
A) 1001
B) 1010
C) 1100
D) 1111
Answer: B) 1010
Rationale: Binary 1010 equals (1 × 8) + (0 × 4) + (1 × 2) + (0 × 1) = 8 + 0 + 2 + 0 = 10 decimal .
CWEA Electrical Instrumentation Technologist Grade 2
Exam–QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
CWEA Electrical/Instrumentation Technologist Grade 2 Exam
Below is a comprehensive study guide for the CWEA Electrical/Instrumentation Technologist Grade 2
Exam,. Content is based on the official CWEA exam matrix, California Code of Regulations, NFPA 70,
NFPA 70E, and standard industrial E&I practices.
Section 1: Electrical Theory & Calculations (Questions 1-40)
1. What is the total resistance of three 30-ohm resistors connected in parallel?
A) 10 ohms
B) 30 ohms
C) 60 ohms
D) 90 ohms
Answer: A) 10 ohms
Rationale: For parallel resistors of equal value, the total resistance is the value of one resistor divided by
the number of resistors (R_total = R/n). Therefore, 30 ohms ÷ 3 = 10 ohms .
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2. According to Kirchhoff's Current Law, the sum of currents entering a node is:
A) Equal to the sum of currents leaving the node
B) Equal to zero only if voltages are balanced
C) Greater than the sum of currents leaving
D) Less than the sum of currents leaving
Answer: A) Equal to the sum of currents leaving the node
Rationale: Kirchhoff's Current Law (KCL) states that the algebraic sum of all currents entering and
leaving a node is zero, meaning the sum of currents entering equals the sum of currents leaving .
3. In a balanced three-phase wye system, the line voltage is how many times the phase voltage?
A) √3 (approximately 1.73)
B) 1/√3 (approximately 0.577)
C) Equal to the phase voltage
D) √2 (approximately 1.414)
Answer: A) √3 (approximately 1.73)
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Rationale: In a wye (star) connection, the line voltage is √3 times the phase voltage (V_line = √3 ×
V_phase). This is because the line voltage is the vector sum of two phase voltages separated by 120
degrees .
4. True power (P) in an AC circuit is measured in which unit?
A) VARs
B) VA
C) Watts
D) Volts
Answer: C) Watts
Rationale: True (real) power is the actual work-producing component of electrical power and is
expressed in watts (W). Apparent power is measured in volt-amps (VA), and reactive power is measured
in VARs .
5. A circuit has a voltage of 120V and a resistance of 12 ohms. What is the current according to Ohm's
Law?
A) 1 amp
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B) 10 amps
C) 12 amps
D) 120 amps
Answer: B) 10 amps
Rationale: According to Ohm's Law, current (I) = voltage (V) divided by resistance (R). Therefore, I =
120V ÷ 12Ω = 10 amperes .
6. What is the binary equivalent of the decimal number 10?
A) 1001
B) 1010
C) 1100
D) 1111
Answer: B) 1010
Rationale: Binary 1010 equals (1 × 8) + (0 × 4) + (1 × 2) + (0 × 1) = 8 + 0 + 2 + 0 = 10 decimal .
