D52 QUIZ OF THE DAY

Which sleeper has the highest life span among the following?

• Timber sleeper
• Steel sleeper
• Concrete sleeper
• Cast iron sleeper

Answer explanation

Cast iron sleepers have a life span of about 60 years, which is the highest among all listed types.

Which of the following rail joints is used only on straight tracks?

• Square joint
• Staggered joint
• Bridge joint
• Suspended joint

Answer explanation

Square joints are used where joints of one rail lie opposite to the joints of the other rail, suitable only for straight tracks.

Which ballast material is commonly used on high-speed trunk routes?

• Gravel
• Moorum
• Brick bats
• Broken granite stone

Answer explanation

Broken granite stone is the best quality ballast used for important and high-speed trunk routes.

The component that links both tongue rails at the toe is:

• Heel block
• Gauge tie plate
• Wing rail
• Stretcher bar

Answer explanation

Stretcher bars link both tongue rails at the toe and are essential for interlocking in switches.

Which type of spike has the highest holding power and is used in high-speed tracks?

• Dog spike
• Screw spike
• Round spike
• Elastic spike

Answer explanation

Screw spikes (also called coach screws) have twice the holding power of dog spikes and are used in high-speed tracks.

Assertion (A): Concrete sleepers are the most commonly used type in India. Reason (R): They are heavier and offer better strength and longer life.

• 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 but R is false
• A is false but R is true

Answer explanation

Concrete sleepers are indeed the most used in India due to their strength, weight, and longevity, making both A and R true with R explaining A.

Which sleeper type is best suited for track circuiting in electrified sections?

• Steel sleeper
• Timber sleeper
• Concrete sleeper
• Cast iron sleeper

Answer explanation

Timber sleepers provide the best insulation and are suitable for track circuiting.

What is the life span of a steel sleeper?

• 12–15 years
• 35–50 years
• 40–60 years
• 60–70 years

Answer explanation

Steel sleepers generally last 35–50 years under standard conditions.

Which type of crossing has a Vee and wings bolted together?

• Built-up crossing
• Cast steel crossing
• CMS crossing
• Spring crossing

Answer explanation

Built-up crossings have Vee and wings bolted together and are easy to repair.

Which welding technique uses chemical reaction and is commonly used in rail welding?

• Oxy-acetylene welding
• Flash butt welding
• Thermite welding
• Electric arc welding

Answer explanation

Thermite welding uses exothermic chemical reactions and is suitable for rail joints.