250+ TOP MCQs on Alignment of Hill Roads – 3 and Answers

Highway Engineering Problems on “Alignment of Hill Roads – 3”.

1. What is the extra width on a hill road with 300 m radius?
a) 0
b) 0.6 m
c) 0.9 m
d) 1.2 m
Answer: a
Clarification: There is no requirement of the extra width on a curve of radius 300 m, whereas for radius of 100 to 300 m extra widening may be 0.6 m, 0.9 m and 1.2 m depending on the requirement and terrain.

2. For a speed of 30 Kmph, and radius of 30 m, the length of the transition curve is?
a) 15 m
b) 30 m
c) 45 m
d) 60 m
Answer: b
Clarification: IRC recommends that, for a speed of 30 Kmph and radius of 30 m, the length of the transition curve is 30 m, the values change depending on the speed and length of the transition curve.

3. What is the minimum speed limit design for hair pin bend?
a) 20 Kmph
b) 30 Kmph
c) 40 Kmph
d) 50 Kmph
Answer: a
Clarification: The minimum speed limit in the hair pin bend is 20 Kmph and if it exceeds it there may be a chance of overturning.

4. What is the super elevation in the circular portion of the curve?
a) 1 in 5
b) 1 in 7
c) 1 in 10
d) 1 in 20
Answer: c
Clarification: The super elevation on the circular portion of the curve is 1 in 10 as suggested by IRC, it may be maximum up to 10%, but 7% is safe.

5. What is the maximum gradient in the curve?
a) 1 in 30
b) 1 in 40
c) 1 in 50
d) 1 in 60
Answer: b
Clarification: The maximum permissible gradient in the circular curve portion is 1 in 40, in plain region it varies from 1 in 30 to 1 in 60.

6. The approach gradient should not be steeper than _______% for 40 m.
a) 5
b) 6
c) 10
d) 20
Answer: a
Clarification: The approach gradient should not be steeper than 5% for 40 m as recommended by IRC, it is permissible by a slight change but if they exceed then there is a change required for the geometric design.

7. What is the minimum carriage way width for MDR?
a) 6.0 m
b) 6.5 m
c) 7.5 m
d) 8.0 m
Answer: c
Clarification: The minimum carriage way width for MDR is 7.5 m and for village road it is 6.5 m, and 7.0 m for 2 lane national highway.

8. The minimum straight length between any two successive hair pin bend should not be less than __________
a) 30 m
b) 40 m
c) 60 m
d) 70 m
Answer: c
Clarification: The minimum straight length between any two successive hair pin bend is 60 m excluding the circular curve and transition curve.

9. The ruling gradient in steep terrain upto 3 km height in % is __________
a) 8
b) 6
c) 7
d) 7.5
Answer: b
Clarification: The ruling, limiting and exceptional gradient above 3000 m are 6, 7 and 8 respectively.

10. The compensated gradient should not be flatter than __________
a) 4%
b) 3%
c) 2%
d) 1%
Answer: a
Clarification: The maximum permissible gradient is 75/R, but they should not be flatter than 4.0%.

11. The value recommended by IRC for a deviation angle of 0.16 and the design speed of 30 Kmph, the length of the summit curve is?
a) 40 m
b) 75 m
c) 100 m
d) 200 m
Answer: c
Clarification: The value of the length of the summit curve is 100 m for a deviation angle of 0.16 and design speed of 30 Kmph, it varies depending on the deviation angle and speed limit.

12. What is the value of the valley curve when compared with the summit curve for the same design speed may be best justified by?
a) Valley curve value is greater
b) Summit curve value is greater
c) Both are equal
d) Depends on the deviation angle
Answer: d
Clarification: The value of the valley curve or summit curve may be greater depends upon the deviation angle.

13. What is the minimum radius of inner curve in hair pin bend?
a) 10 m
b) 12 m
c) 14 m
d) 16 m
Answer: c
Clarification: The minimum radius of the innermost curve for a hair pin bend is 14 m as recommended by IRC, if there is enough space they may be up to 16 m also.

14. What is the maximum gradient compensation for a pavement of the radius 150 m?
a) 1%
b) 2%
c) 3%
d) 4%
Answer: b
Clarification: The maximum gradient compensation is 75/R, which is 75/150=2%.

15. The right of way width in normal area for a two lane national highway is __________
a) 18 m
b) 24 m
c) 36 m
d) 45 m
Answer: b
Clarification: The minimum right of way width for a 2 lane national highway is 24 m in normal cases and 18 m in exceptional cases, if illegally occupied then they may be up to 45 m.

Highway Engineering Problems,