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NEIEP 600 Final Exam – Newest 2026 Actual Exam |
National Elevator Industry Educational Program | IUEC
Apprentice Certification | 100% Pass Guaranteed |
Graded A+
1. What happens in a DC circuit when the capacitor voltage equals the source voltage?
A. Current flow increases rapidly
B. Current flow stops in the circuit
C. The capacitor discharges completely
D. Voltage reverses polarity
☑ Correct Answer: B
☑ Explanation: When a capacitor in a DC circuit reaches the same voltage as the source, it
is fully charged. At this point, no further current flows because there is no potential difference to
drive electron movement. The capacitor acts as an open circuit under steady-state DC
conditions.
2. In capacitors, what is the primary purpose of the dielectric material?
A. To store charge
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B. To prevent arcing within the capacitor
C. To increase resistance
D. To decrease capacitance
☑ Correct Answer: B
☑ Explanation: The dielectric material is an insulator placed between the capacitor plates.
Its primary purpose is to prevent electrical arcing or short circuits between the plates while
allowing the electric field to establish and store energy.
3. What is the time constant (TC) for a circuit with a 150 kΩ resistor and a 2 μF capacitor? (TC
= R × C)
A. 0.03 seconds
B. 0.3 seconds
C. 3.0 seconds
D. 30 seconds
☑ Correct Answer: B
☑ Explanation: The time constant (τ) is calculated by multiplying resistance and
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capacitance: τ = R × C = 150,000 Ω × 0.000002 F = 0.3 seconds. This represents the time required
for the capacitor to charge to approximately 63.2% of the source voltage.
4. How long will it take for a capacitor to be considered fully charged?
A. 1 time constant
B. 3 time constants
C. 5 time constants
D. 10 time constants
☑ Correct Answer: C
☑ Explanation: A capacitor is considered fully charged after approximately 5 time
constants (5τ). At this point, the capacitor has reached about 99.3% of the source voltage. One
time constant represents 63.2% charge.
5. Which of the following is true about capacitors in AC circuits?
A. Voltage leads current at all times
B. Current leads voltage at all times
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C. Current and voltage are in phase
D. Capacitors block all AC current
☑ Correct Answer: B
☑ Explanation: In a purely capacitive AC circuit, current leads voltage by 90 degrees. This
occurs because the capacitor must first build a charge before voltage can develop across it. The
current flow happens first to accumulate charge on the plates, then the voltage rises.
6. What describes a capacitor's ability to store an electrical charge?
A. Inductance
B. Resistance
C. Capacitance
D. Impedance
☑ Correct Answer: C
☑ Explanation: Capacitance is the measure of a capacitor's ability to store an electrical
charge. It is defined as the ratio of the electric charge on each conductor to the potential
difference between them.
NEIEP 600 Final Exam – Newest 2026 Actual Exam |
National Elevator Industry Educational Program | IUEC
Apprentice Certification | 100% Pass Guaranteed |
Graded A+
1. What happens in a DC circuit when the capacitor voltage equals the source voltage?
A. Current flow increases rapidly
B. Current flow stops in the circuit
C. The capacitor discharges completely
D. Voltage reverses polarity
☑ Correct Answer: B
☑ Explanation: When a capacitor in a DC circuit reaches the same voltage as the source, it
is fully charged. At this point, no further current flows because there is no potential difference to
drive electron movement. The capacitor acts as an open circuit under steady-state DC
conditions.
2. In capacitors, what is the primary purpose of the dielectric material?
A. To store charge
,2
B. To prevent arcing within the capacitor
C. To increase resistance
D. To decrease capacitance
☑ Correct Answer: B
☑ Explanation: The dielectric material is an insulator placed between the capacitor plates.
Its primary purpose is to prevent electrical arcing or short circuits between the plates while
allowing the electric field to establish and store energy.
3. What is the time constant (TC) for a circuit with a 150 kΩ resistor and a 2 μF capacitor? (TC
= R × C)
A. 0.03 seconds
B. 0.3 seconds
C. 3.0 seconds
D. 30 seconds
☑ Correct Answer: B
☑ Explanation: The time constant (τ) is calculated by multiplying resistance and
,3
capacitance: τ = R × C = 150,000 Ω × 0.000002 F = 0.3 seconds. This represents the time required
for the capacitor to charge to approximately 63.2% of the source voltage.
4. How long will it take for a capacitor to be considered fully charged?
A. 1 time constant
B. 3 time constants
C. 5 time constants
D. 10 time constants
☑ Correct Answer: C
☑ Explanation: A capacitor is considered fully charged after approximately 5 time
constants (5τ). At this point, the capacitor has reached about 99.3% of the source voltage. One
time constant represents 63.2% charge.
5. Which of the following is true about capacitors in AC circuits?
A. Voltage leads current at all times
B. Current leads voltage at all times
, 4
C. Current and voltage are in phase
D. Capacitors block all AC current
☑ Correct Answer: B
☑ Explanation: In a purely capacitive AC circuit, current leads voltage by 90 degrees. This
occurs because the capacitor must first build a charge before voltage can develop across it. The
current flow happens first to accumulate charge on the plates, then the voltage rises.
6. What describes a capacitor's ability to store an electrical charge?
A. Inductance
B. Resistance
C. Capacitance
D. Impedance
☑ Correct Answer: C
☑ Explanation: Capacitance is the measure of a capacitor's ability to store an electrical
charge. It is defined as the ratio of the electric charge on each conductor to the potential
difference between them.
