D53 CHECK YOUR LEVEL

Which component of a theodolite helps to center it exactly over a station point?

• Optical plummet
• Telescope
• Index frame
• Altitude bubble

Answer explanation

Optical plummet is used for accurate centering of the theodolite when plumb bob is unstable due to wind.

The effective length of a standard rail on Broad Gauge track in India is:

• 11.89 m
• 13.00 m
• 12.8 m
• 13.5 m

Answer explanation

The standard rail length for BG in India is 12.8 m to minimize joints and maintenance.

Assertion (A): T-beams in RCC construction are more efficient in flexure. Reason (R): The slab portion of a T-beam acts as the flange resisting tension

• Both A and R are true, and R is the correct explanation of A
• Both A and R are true, but R is not the correct explanation of A
• A is true, R is false
• A is false, R is true

Answer explanation

T-beams combine the slab and beam so that the slab acts as compression flange, enhancing flexural strength.

Which of the following members in steel structures is subjected to axial tension only?

• Column
• Beam
• Tie member
• Strut

Answer explanation

Tie members are structural elements subjected to pure axial tension.

The value of stress in a steel bar of area 400 mm² carrying a load of 40 kN is:

• 100 N/mm²
• 80 N/mm²
• 120 N/mm²
• 60 N/mm²

Answer explanation

Stress = Load / Area = 40000 N / 400 mm² = 100 N/mm².

What is the typical weight of a 52 kg rail section used in Indian Railways?

• 52 kg per foot
• 52 kg per metre
• 52 kg per 10 metre
• 52 kg per yard

Answer explanation

The 52 kg rail refers to the weight per metre of the rail section.

Which station equipment is used to reverse the direction of an engine using three sets of tracks?

• Turn table
• Triangle
• Traverser
• Buffer stop

Answer explanation

A triangle in a railway station uses three tracks to reverse engine direction by 180°.

In RCC beams, side face reinforcement is required when the depth of the web exceeds:

• 450 mm
• 500 mm
• 750 mm
• 600 mm

Answer explanation

Side face reinforcement is provided when web depth exceeds 750 mm to resist side cracking.

Minimum clear cover for longitudinal bars in RCC beams is:

• 20 mm
• 25 mm
• 30 mm
• 15 mm

Answer explanation

IS 456 recommends a minimum clear cover of 25 mm or bar diameter, whichever is greater.

Which of the following is used to transfer wagons between parallel tracks without shunting?

• Turntable
• Scotch block
• Traverser
• Cow catcher

Answer explanation

Traverser moves wagons laterally to a parallel track without changing direction.