Ohio Skilled Trades & Construction
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary purpose of a construction contract?
A. To eliminate all project risks
B. To establish the rights and obligations of the parties
C. To avoid obtaining permits
D. To guarantee a specific profit
Answer: To establish the rights and obligations of the parties
Rationale: A construction contract defines the responsibilities, scope of work,
payment terms, schedule, and other obligations of the parties involved.
2. Which document generally describes the work to be performed, materials
required, and quality standards?
A. Payroll register
B. Project specifications
C. Tax return
D. Equipment inventory
Answer: Project specifications
Rationale: Specifications provide detailed requirements for materials,
workmanship, performance, and installation.
, 3. What is the safest first action when beginning work on an unfamiliar
electrical circuit?
A. Remove the grounding conductor
B. Turn the circuit on
C. Identify and de-energize the circuit
D. Increase the breaker size
Answer: Identify and de-energize the circuit
Rationale: Proper circuit identification and de-energization help prevent
electrical shock, arc-flash incidents, and accidental energization.
4. What device is designed to open a circuit when excessive current flows?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Junction box
Answer: Circuit breaker
Rationale: A circuit breaker automatically interrupts current when an
overcurrent condition occurs.
5. What is the primary purpose of an equipment grounding conductor?
A. To increase voltage
B. To provide a low-impedance path for fault current
C. To reduce wire size
D. To supply normal operating current
Answer: To provide a low-impedance path for fault current
Rationale: The equipment grounding conductor provides a path that allows
protective devices to operate during a ground fault.
6. Which electrical measurement is expressed in amperes?
,A. Resistance
B. Voltage
C. Current
D. Power factor
Answer: Current
Rationale: The ampere is the unit used to measure electric current.
7. Which instrument is commonly used to measure electrical resistance?
A. Ammeter
B. Ohmmeter
C. Tachometer
D. Manometer
Answer: Ohmmeter
Rationale: An ohmmeter measures resistance in ohms and is normally used on a
de-energized circuit.
8. What is the purpose of a GFCI?
A. Increase circuit voltage
B. Protect against ground-fault shock hazards
C. Control motor speed
D. Measure resistance
Answer: Protect against ground-fault shock hazards
Rationale: A ground-fault circuit interrupter detects differences between
outgoing and returning current and disconnects power when a dangerous
imbalance occurs.
9. Which material is commonly used for residential water supply piping?
A. Copper
B. Untreated wood
, C. Gypsum board
D. Structural steel only
Answer: Copper
Rationale: Copper is widely used for water distribution because it is durable,
corrosion resistant, and suitable for potable water applications when properly
installed.
10.What is the purpose of a plumbing trap?
A. Increase water pressure
B. Prevent sewer gases from entering occupied spaces
C. Increase pipe diameter
D. Heat the water
Answer: Prevent sewer gases from entering occupied spaces
Rationale: The water seal in a properly installed trap blocks sewer gases from
passing through the drainage system into a building.
11.What does a plumbing vent primarily provide?
A. Fuel to appliances
B. Air circulation and pressure equalization in the drainage system
C. Electrical grounding
D. Water heating
Answer: Air circulation and pressure equalization in the drainage system
Rationale: Proper venting protects trap seals and allows drainage systems to
operate without excessive pressure fluctuations.
12.What is the purpose of a cleanout in a drainage system?
A. To increase water temperature
B. To provide access for drain cleaning and maintenance
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. What is the primary purpose of a construction contract?
A. To eliminate all project risks
B. To establish the rights and obligations of the parties
C. To avoid obtaining permits
D. To guarantee a specific profit
Answer: To establish the rights and obligations of the parties
Rationale: A construction contract defines the responsibilities, scope of work,
payment terms, schedule, and other obligations of the parties involved.
2. Which document generally describes the work to be performed, materials
required, and quality standards?
A. Payroll register
B. Project specifications
C. Tax return
D. Equipment inventory
Answer: Project specifications
Rationale: Specifications provide detailed requirements for materials,
workmanship, performance, and installation.
, 3. What is the safest first action when beginning work on an unfamiliar
electrical circuit?
A. Remove the grounding conductor
B. Turn the circuit on
C. Identify and de-energize the circuit
D. Increase the breaker size
Answer: Identify and de-energize the circuit
Rationale: Proper circuit identification and de-energization help prevent
electrical shock, arc-flash incidents, and accidental energization.
4. What device is designed to open a circuit when excessive current flows?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Junction box
Answer: Circuit breaker
Rationale: A circuit breaker automatically interrupts current when an
overcurrent condition occurs.
5. What is the primary purpose of an equipment grounding conductor?
A. To increase voltage
B. To provide a low-impedance path for fault current
C. To reduce wire size
D. To supply normal operating current
Answer: To provide a low-impedance path for fault current
Rationale: The equipment grounding conductor provides a path that allows
protective devices to operate during a ground fault.
6. Which electrical measurement is expressed in amperes?
,A. Resistance
B. Voltage
C. Current
D. Power factor
Answer: Current
Rationale: The ampere is the unit used to measure electric current.
7. Which instrument is commonly used to measure electrical resistance?
A. Ammeter
B. Ohmmeter
C. Tachometer
D. Manometer
Answer: Ohmmeter
Rationale: An ohmmeter measures resistance in ohms and is normally used on a
de-energized circuit.
8. What is the purpose of a GFCI?
A. Increase circuit voltage
B. Protect against ground-fault shock hazards
C. Control motor speed
D. Measure resistance
Answer: Protect against ground-fault shock hazards
Rationale: A ground-fault circuit interrupter detects differences between
outgoing and returning current and disconnects power when a dangerous
imbalance occurs.
9. Which material is commonly used for residential water supply piping?
A. Copper
B. Untreated wood
, C. Gypsum board
D. Structural steel only
Answer: Copper
Rationale: Copper is widely used for water distribution because it is durable,
corrosion resistant, and suitable for potable water applications when properly
installed.
10.What is the purpose of a plumbing trap?
A. Increase water pressure
B. Prevent sewer gases from entering occupied spaces
C. Increase pipe diameter
D. Heat the water
Answer: Prevent sewer gases from entering occupied spaces
Rationale: The water seal in a properly installed trap blocks sewer gases from
passing through the drainage system into a building.
11.What does a plumbing vent primarily provide?
A. Fuel to appliances
B. Air circulation and pressure equalization in the drainage system
C. Electrical grounding
D. Water heating
Answer: Air circulation and pressure equalization in the drainage system
Rationale: Proper venting protects trap seals and allows drainage systems to
operate without excessive pressure fluctuations.
12.What is the purpose of a cleanout in a drainage system?
A. To increase water temperature
B. To provide access for drain cleaning and maintenance
