D66 MASTER THE DAY

The minimum number of main bars to be provided in an RCC beam is:

• 1
• 2
• 3
• 4

Answer explanation

At least 2 main bars are required in an RCC beam to ensure structural stability and redundancy.

Diameter range of main bars in RCC beams is generally:

• 6–10 mm
• 8–20 mm
• 10–40 mm
• 12–50 mm

Answer explanation

Main bars in RCC beams typically range from 10 mm to 40 mm in diameter.

Diameter range of stirrups in RCC beams is generally:

• 4–8 mm
• 5–9 mm
• 6–10 mm
• 8–12 mm

Answer explanation

Stirrups are usually made from steel bars of 6 to 10 mm diameter.

Minimum spacing of stirrups in RCC beams is:

• 50 mm
• 75 mm
• 100 mm
• 125 mm

Answer explanation

Minimum spacing of stirrups is 100 mm to ensure adequate shear resistance.

Maximum spacing of stirrups in RCC beams is limited to:

• Lever arm of the beam
• Overall depth of beam
• 0.5 depth of beam
• Twice the lever arm

Answer explanation

Maximum stirrup spacing should not exceed the lever arm of the beam as per IS 456.

Minimum top steel near supports should be:

• Equal to main bottom steel
• 1.5 times main bottom steel
• 2 times main bottom steel
• 0.5 times main bottom steel

Answer explanation

Top steel near supports should be twice the main bottom steel to resist negative moments.

Minimum steel to be carried straight on supports is:

• 25% of main steel
• 40% of main steel
• 50% of main steel
• 60% of main steel

Answer explanation

At least 50% of the main tension reinforcement should be continued straight over supports.

Effective span of simply supported beam is taken as:

• Clear span + bearing length
• Clear span + effective depth
• Clear span only
• None

Answer explanation

For design, effective span is taken as clear span plus effective depth of beam.

Effective span of a cantilever beam is measured from:

• Centre of support to free end
• Edge of support to free end
• Mid depth of support to free end

• None

Answer explanation

For cantilever beams, effective span is from free end to edge of the support.

Span/depth ratio for cantilever beams should not exceed:

• 8
• 10
• 12
• 15

Answer explanation

For cantilever beams, the maximum span-to-depth ratio is 10 to control deflection.