NEIEP 300 EXAM PRACTICE - 200 QUESTIONS ,
answers & rationales | latest update
QUICK REFERENCE
| Electrical Theory & Fundamentals | 1-30
| Elevator Systems & Components | 31-70
| Safety Codes & Regulations | 71-110
| Hydraulic Elevators | 111-140
| Electrical Controls & Troubleshooting | 141-170
| Maintenance, Troubleshooting & Safety | 171-200
ELECTRICAL THEORY & FUNDAMENTALS (Questions 1-30)
1. What is the unit of electrical resistance?**
A) Ampere
B) Volt
C) Ohm (Correct Answer)
D) Watt
**Rationale:** Resistance is measured in ohms (Ω), named after Georg Ohm. Ampere measures
current, volt measures potential difference, and watt measures power.
**2. In a series circuit, if one resistor opens, what happens to the current flow?**
A) Current increases through remaining resistors
B) Current stops completely in the entire circuit (Correct Answer)
C) Current bypasses the open resistor
D) Current decreases by half
,**Rationale:** In a series circuit, there is only one path for current. An open anywhere breaks
the entire circuit, stopping all current flow (I = 0).
---
**3. What is the formula for Ohm's Law?**
A) P = VI
B) V = IR (Correct Answer)
C) R = VI
D) I = VR
**Rationale:** Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R):
V = IR. This is the fundamental relationship in circuit analysis.
**4. What happens to total resistance when resistors are connected in parallel?**
A) Total resistance increases
B) Total resistance decreases (Correct Answer)
C) Total resistance stays the same
D) Total resistance equals the largest resistor
**Rationale:** Parallel connections provide additional paths for current, reducing overall
opposition to flow. Total parallel resistance is always less than the smallest individual resistor.
---
**5. What is the power formula when voltage and current are known?**
,A) P = V/I
B) P = I²R
C) P = VI (Correct Answer)
D) P = V²/I
**Rationale:** Electrical power (P) in watts equals voltage (V) multiplied by current (I). This is
the fundamental power equation derived from the definition of power as work per unit time.
---
**6. What type of current flows in one direction only?**
A) Alternating current
B) Direct current (Correct Answer)
C) Pulsating current
D) Oscillating current
**Rationale:** Direct current (DC) flows consistently in one direction. Alternating current (AC)
periodically reverses direction. Batteries produce DC; utility power is AC.
---
**7. What is the frequency of standard North American AC power?**
A) 50 Hz
B) 60 Hz (Correct Answer)
C) 120 Hz
D) 240 Hz
, **Rationale:** North American electrical systems operate at 60 Hz (hertz = cycles per second).
Most of Europe and Asia use 50 Hz. This frequency affects motor speeds and transformer
design.
---
**8. What device stores electrical energy in an electric field?**
A) Inductor
B) Resistor
C) Capacitor (Correct Answer)
D) Transformer
**Rationale:** Capacitors store energy in an electrostatic field between conductive plates
separated by a dielectric. Inductors store energy in magnetic fields.
---
**9. What is the phase relationship between voltage and current in a purely inductive circuit?**
A) Voltage and current are in phase
B) Current leads voltage by 90°
C) Voltage leads current by 90° (Correct Answer)
D) Voltage lags current by 180°
**Rationale:** In an inductor, the induced back EMF opposes changes in current, causing
current to lag behind voltage by 90° (or voltage leads current by 90°).
---
answers & rationales | latest update
QUICK REFERENCE
| Electrical Theory & Fundamentals | 1-30
| Elevator Systems & Components | 31-70
| Safety Codes & Regulations | 71-110
| Hydraulic Elevators | 111-140
| Electrical Controls & Troubleshooting | 141-170
| Maintenance, Troubleshooting & Safety | 171-200
ELECTRICAL THEORY & FUNDAMENTALS (Questions 1-30)
1. What is the unit of electrical resistance?**
A) Ampere
B) Volt
C) Ohm (Correct Answer)
D) Watt
**Rationale:** Resistance is measured in ohms (Ω), named after Georg Ohm. Ampere measures
current, volt measures potential difference, and watt measures power.
**2. In a series circuit, if one resistor opens, what happens to the current flow?**
A) Current increases through remaining resistors
B) Current stops completely in the entire circuit (Correct Answer)
C) Current bypasses the open resistor
D) Current decreases by half
,**Rationale:** In a series circuit, there is only one path for current. An open anywhere breaks
the entire circuit, stopping all current flow (I = 0).
---
**3. What is the formula for Ohm's Law?**
A) P = VI
B) V = IR (Correct Answer)
C) R = VI
D) I = VR
**Rationale:** Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R):
V = IR. This is the fundamental relationship in circuit analysis.
**4. What happens to total resistance when resistors are connected in parallel?**
A) Total resistance increases
B) Total resistance decreases (Correct Answer)
C) Total resistance stays the same
D) Total resistance equals the largest resistor
**Rationale:** Parallel connections provide additional paths for current, reducing overall
opposition to flow. Total parallel resistance is always less than the smallest individual resistor.
---
**5. What is the power formula when voltage and current are known?**
,A) P = V/I
B) P = I²R
C) P = VI (Correct Answer)
D) P = V²/I
**Rationale:** Electrical power (P) in watts equals voltage (V) multiplied by current (I). This is
the fundamental power equation derived from the definition of power as work per unit time.
---
**6. What type of current flows in one direction only?**
A) Alternating current
B) Direct current (Correct Answer)
C) Pulsating current
D) Oscillating current
**Rationale:** Direct current (DC) flows consistently in one direction. Alternating current (AC)
periodically reverses direction. Batteries produce DC; utility power is AC.
---
**7. What is the frequency of standard North American AC power?**
A) 50 Hz
B) 60 Hz (Correct Answer)
C) 120 Hz
D) 240 Hz
, **Rationale:** North American electrical systems operate at 60 Hz (hertz = cycles per second).
Most of Europe and Asia use 50 Hz. This frequency affects motor speeds and transformer
design.
---
**8. What device stores electrical energy in an electric field?**
A) Inductor
B) Resistor
C) Capacitor (Correct Answer)
D) Transformer
**Rationale:** Capacitors store energy in an electrostatic field between conductive plates
separated by a dielectric. Inductors store energy in magnetic fields.
---
**9. What is the phase relationship between voltage and current in a purely inductive circuit?**
A) Voltage and current are in phase
B) Current leads voltage by 90°
C) Voltage leads current by 90° (Correct Answer)
D) Voltage lags current by 180°
**Rationale:** In an inductor, the induced back EMF opposes changes in current, causing
current to lag behind voltage by 90° (or voltage leads current by 90°).
---
