D54 FACE THE CHALLENGE

What is the minimum effective depth (D) of a T-beam for a medium load where span L is known?

• D ≥ L/10
• D ≥ L/12 to L/15
• D ≥ L/20
• D ≥ L/15 to L/20

Answer explanation

For medium loads in T-beams, the effective depth D should be L/12 to L/15.

Which steel section is most suitable for making gantry girders due to wide flanges?

• ISWB
• ISMB
• ISJB
• ISLB

Answer explanation

ISWB (Wide Flange Beams) are ideal for gantry girders.

Which component of a railway station enables 180° engine reversal using three tracks?

• Turn table
• Traverser
• Triangle
• Buffer stop

Answer explanation

Triangle is used to reverse an engine’s direction using three connected tracks.

Who is known as the 'Father of Indian Railways'?

• George Stephenson
• Richard Trevithick
• Robert Stephenson
• Lord Dalhousie

Answer explanation

Lord Dalhousie is credited as the Father of Indian Railways.

Which part of a theodolite supports the telescope on the horizontal axis?

• A-frame
• Vernier plate
• T-frame
• Shifting head

Answer explanation

The A-frame (standards) hold the telescope and horizontal axis.

Which component of RCC beams is added when depth is limited or reversal of moments occurs?

• Cranked bar
• Compression reinforcement
• Extra stirrups
• Shear ties

Answer explanation

Compression reinforcement is added in doubly reinforced beams under such conditions.

The modulus of elasticity (E) for structural steel is approximately:

• 2 × 10³ MPa
• 0.769 × 10⁵ MPa
• 2 × 10⁵ MPa
• 7850 MPa

Answer explanation

E = 2 × 10⁵ MPa for structural steel as per IS 800:2007.

Find stress in a 25 mm thick steel plate subjected to 50 kN axial load over 250 mm width.

• 6 N/mm²

• 8 N/mm²

• 10 N/mm²

• 12 N/mm²

Answer explanation

Area = 25×250 = 6250 mm²; Stress = 50000/6250 = 8 MPa = 8N/mm².

What is the standard length of rail used on BG tracks in India?

• 12.5 m
• 12.8 m
• 13.0 m
• 11.89 m

Answer explanation

BG tracks use 12.8 m standard rail length.

Which plate in a theodolite includes 0–360° main graduations?

• Upper plate
• Vertical circle
• Lower plate
• Tangent screw

Answer explanation

Lower plate carries the full circle main graduations.