Exam Questions And Correct Answers

CA C50 Reinforcing Steel Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• Which of the following is the primary purpose of reinforcing steel in

concrete construction?

• To provide fire resistance
• To carry tensile loads
• To improve aesthetics
• To reduce concrete shrinkage
• To carry tensile loads

Rationale: Concrete is strong in compression but weak in tension.

Reinforcing steel (rebar) provides the tensile strength needed.

• What is the typical spacing for standard #4 rebar in a reinforced

concrete slab?

• 6 inches
• 12 inches
• 18 inches
• 24 inches
• 12 inches

Rationale: Standard practices in slab reinforcement often use #4 rebar

spaced at 12 inches on center, unless structural calculations dictate otherwise.

• Which of the following affects the bond between concrete and

reinforcing steel? 1 / 3

• Concrete mix design
• Surface texture of the steel
• Placement and vibration of concrete
• All of the above
• All of the above

Rationale: Bond strength is influenced by concrete quality, rebar surface

deformations, and proper placement and compaction.

4. Epoxy-coated rebar is primarily used to:

• Increase tensile strength
• Reduce corrosion
• Improve bonding with concrete
• Enhance flexibility
• Reduce corrosion

Rationale: Epoxy coating protects steel from moisture and chlorides, which

reduces the risk of corrosion in aggressive environments.

• The minimum concrete cover for reinforcing steel in an exterior

column exposed to weather is typically:

• 1 inch
• 1.5 inches
• 2 inches
• 3 inches
• 2 inches

Rationale: Minimum cover ensures protection of rebar against corrosion

and fire according to standard building codes.

• Which type of steel is commonly used for reinforcing concrete?
• Stainless steel
• Mild steel
• High-strength deformed steel
• Galvanized steel 2 / 3

• High-strength deformed steel

Rationale: High-strength deformed steel has ribs to improve bonding with

concrete and is commonly used in reinforced concrete construction.

• What is the purpose of stirrups in reinforced concrete beams?
• To carry axial loads
• To resist shear forces
• To support concrete curing
• To reduce concrete shrinkage
• To resist shear forces

Rationale: Stirrups are transverse reinforcement that prevent diagonal

cracking due to shear in beams.

8. The standard diameter of a #5 rebar is:

• 5/8 inch
• 1/2 inch
• 3/4 inch
• 1 inch
• 5/8 inch

Rationale: Rebar sizes are standardized; #5 rebar corresponds to a nominal

diameter of 5/8 inch.

• Which of the following rebar bending operations is unsafe if done

without proper equipment?

• Mild bending
• Field cutting
• Cold bending beyond recommended radius
• Using standard bending tools
• Cold bending beyond recommended radius

Rationale: Exceeding the minimum bending radius can cause cracks or

fractures in steel, compromising structural integrity.

• How is the yield strength of reinforcing steel typically expressed?
• PSI or MPa
• Newtons
• / 3