NHIE FINAL REVIEW EXAM QUESTIONS (DAY BEFORE TEST) LATEST
2026 UPDATE FAST REVIWED FROM ACTUAL TEST 100 QUESTIONS
AND 100% VERIFIED ANSWERS| A+ GRADE Q&A | INSTANT
DOWNLOAD PDF
1. What is the primary purpose of a GFCI (Ground Fault Circuit Interrupter)?
A. Protect circuits from overload
B. Reduce energy consumption
C. Protect people from electric shock
D. Stabilize voltage fluctuations
GFCIs detect ground faults and disconnect power to prevent injury.
2. Which type of insulation is best for high-temperature areas?
A. Fiberglass
B. Polystyrene
C. Mineral wool
D. Cellulose
Mineral wool can withstand higher temperatures without degrading.
3. What is the typical minimum slope for a residential roof to ensure proper
drainage?
A. 1/4 inch per foot
B. 1/2 inch per foot
C. 1 inch per foot
D. 2 inches per foot
A slope of 1/2 inch per foot allows water to drain effectively and prevents
leaks.
4. In plumbing, a vent pipe is required to:
A. Increase water pressure
B. Remove wastewater odors
C. Allow air into the drainage system
D. Filter impurities
Vent pipes prevent siphoning and maintain proper flow.
,5. Which material is most suitable for underground water supply piping?
A. PVC Schedule 40
B. Copper Type L
C. PEX
D. CPVC
PEX is flexible, resistant to corrosion, and suitable for buried installations.
6. What is the minimum distance a smoke detector should be installed from a
wall?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Detectors should not be too close to walls or corners to detect smoke
effectively.
7. For a typical single-family home, the standard main service panel voltage is:
A. 120V
B. 240V
C. 208V
D. 480V
Most residential homes use a split-phase 240V system for high-power
appliances.
8. Which is the primary concern when inspecting a foundation?
A. Paint quality
B. Structural integrity
C. Plumbing layout
D. Roof slope
Foundation issues can compromise the entire building’s safety.
9. In HVAC systems, what is the purpose of a condensate drain?
A. Reduce noise
B. Remove excess water from the system
C. Increase airflow
, D. Filter dust
Condensate drains prevent water accumulation and mold growth.
10.Which fire rating is standard for interior doors in residential buildings?
A. 15 minutes
B. 20 minutes
C. 30 minutes
D. 60 minutes
This rating helps delay fire spread and provides safe evacuation time.
11.What is the minimum thickness of a concrete slab for a residential
driveway?
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
Four inches is standard to support vehicle weight without cracking.
12.Which type of wiring is most common in new residential construction?
A. Aluminum
B. Copper
C. Steel
D. Fiber optic
Copper wiring is durable, safe, and has better conductivity than
aluminum.
13.What is the maximum spacing for ceiling joists in a standard residential
floor?
A. 12 inches
B. 16 inches
C. 24 inches
D. 36 inches
24 inches is the maximum recommended spacing to support flooring and
live loads.
2026 UPDATE FAST REVIWED FROM ACTUAL TEST 100 QUESTIONS
AND 100% VERIFIED ANSWERS| A+ GRADE Q&A | INSTANT
DOWNLOAD PDF
1. What is the primary purpose of a GFCI (Ground Fault Circuit Interrupter)?
A. Protect circuits from overload
B. Reduce energy consumption
C. Protect people from electric shock
D. Stabilize voltage fluctuations
GFCIs detect ground faults and disconnect power to prevent injury.
2. Which type of insulation is best for high-temperature areas?
A. Fiberglass
B. Polystyrene
C. Mineral wool
D. Cellulose
Mineral wool can withstand higher temperatures without degrading.
3. What is the typical minimum slope for a residential roof to ensure proper
drainage?
A. 1/4 inch per foot
B. 1/2 inch per foot
C. 1 inch per foot
D. 2 inches per foot
A slope of 1/2 inch per foot allows water to drain effectively and prevents
leaks.
4. In plumbing, a vent pipe is required to:
A. Increase water pressure
B. Remove wastewater odors
C. Allow air into the drainage system
D. Filter impurities
Vent pipes prevent siphoning and maintain proper flow.
,5. Which material is most suitable for underground water supply piping?
A. PVC Schedule 40
B. Copper Type L
C. PEX
D. CPVC
PEX is flexible, resistant to corrosion, and suitable for buried installations.
6. What is the minimum distance a smoke detector should be installed from a
wall?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Detectors should not be too close to walls or corners to detect smoke
effectively.
7. For a typical single-family home, the standard main service panel voltage is:
A. 120V
B. 240V
C. 208V
D. 480V
Most residential homes use a split-phase 240V system for high-power
appliances.
8. Which is the primary concern when inspecting a foundation?
A. Paint quality
B. Structural integrity
C. Plumbing layout
D. Roof slope
Foundation issues can compromise the entire building’s safety.
9. In HVAC systems, what is the purpose of a condensate drain?
A. Reduce noise
B. Remove excess water from the system
C. Increase airflow
, D. Filter dust
Condensate drains prevent water accumulation and mold growth.
10.Which fire rating is standard for interior doors in residential buildings?
A. 15 minutes
B. 20 minutes
C. 30 minutes
D. 60 minutes
This rating helps delay fire spread and provides safe evacuation time.
11.What is the minimum thickness of a concrete slab for a residential
driveway?
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
Four inches is standard to support vehicle weight without cracking.
12.Which type of wiring is most common in new residential construction?
A. Aluminum
B. Copper
C. Steel
D. Fiber optic
Copper wiring is durable, safe, and has better conductivity than
aluminum.
13.What is the maximum spacing for ceiling joists in a standard residential
floor?
A. 12 inches
B. 16 inches
C. 24 inches
D. 36 inches
24 inches is the maximum recommended spacing to support flooring and
live loads.
