Civil war-Day 33-LSGD-Highway curves & gradients

Over turning of vehicles on a curve can be avoided by using,

• Compound curve
• Vertical curve
• Transition curve
• Reverse curve

Answer explanation

A transition curve provides gradual change of curvature, reducing centrifugal effects and preventing overturning.

What is the degree of the curve for arc length 30m?

• 1080/R Degree
• 1718.9/R Degree
• 1817.9/R Degree
• 1145.92/R Degree

Answer explanation

Degree of curve by arc definition: D = 1718.9 / R (for arc length = 30 m).

A curve provided to smoothen out sharp changes of grade is known as

• Compound Curve
• Transition curve
• Vertical curve
• Simple curve

Answer explanation

Vertical curves are used to smoothen changes in gradient between two different grades.

Curve with an upward convexity

• Sag curve
• Crest curve
• Summit curve
• Both crest and summit curve

Answer explanation

Upward convex vertical curves are crest curves, also called summit curves. Therefore, the correct choice is "Both crest and summit curve."

The rate of change of centrifugal acceleration for a design speed of 85 kmph:

• 0.3
• 0.4
• 0.5
• 0.8

Answer explanation

According to IRC guidelines, for design speeds around 80–100 km/h, the permissible rate of change of centrifugal acceleration is approximately 0.5 m/s³.

The gradient which the vehicles whether animal driven or power driven can climb without fatigue is known as

• Average gradient
• Ruling gradient
• Exceptional gradient
• Floating gradient

Answer explanation

Ruling gradient is the maximum gradient that vehicles can negotiate comfortably and continuously without causing strain or fatigue to the engine or animals.

Grade compensation is not necessary for gradients less than

• 4.5%
• 5%
• 4%
• 6%

Answer explanation

According to IRC, grade compensation is not required when the gradient is less than 4%.

A gradient along which the vehicle does not require any tractive effort to maintain a specific speed is

• Ruling gradient
• Limiting gradient
• Floating gradient
• Minimum gradient

Answer explanation

Floating gradient is the gradient at which the vehicle moves at constant speed without requiring tractive effort; gravitational pull balances resistance.

Limiting Gradient in steep terrain is?

• A 3.3
• B 5 %
• 6 %
• 7 %

Answer explanation

According to IRC recommendations, the limiting (maximum permissible) gradient for steep terrain is about 7%.

Exceptional gradient should not be adopted for distances greater than 100m in a stretch of

• 0.5 km
• 1 km
• 1.6 km
• 2.3 km

Answer explanation

As per IRC, exceptional gradients should not exceed 100 m length in any continuous stretch of 1.6 km.