Highway Engineering Questions (h4)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.

1. If the design speed is 60 Km/Hour and coefficient of friction is 0.36 then what will be the stopping sight distance?

   
   

   1. 86 m
   2. 81 m
   3. 76 m
   4. 71 m

   View Answer

   Answer: b
   Stopping side distance $=0.278 \times V \times t + \frac{V^2}{254 \times f}$
   $V=$ velocity in KMPH; $t=$ reaction time $=2.5 s$
   $f=$ coefficient of friction



2. As per IRC, Intermeidate sight distance is ...

   
   

   1. 2 times the stopping sight distance
   2. 1/2 times the stopping sight distance
   3. equal to the stopping sight distance
   4. 4 times the stopping sight distance

   View Answer

   Answer: a



3. While going down the grade, the driver requires a braking distance twice that required for stopping the vehicle when he travels up the same grade. If the speed of the vehicle is 30 KMPH and coefficient of friction is 0.4 then what will be the grade?

   
   

   1. 7 %
   2. 33.3 %
   3. 10.6 %
   4. 13.3 %

   View Answer

   Answer: d
   If ${L}_{d}$ is the stopping distance down the grade and ${L}_{u}$ is SD up the grade and G is the grade then,
   
   ${L}_{d}= 2 \times {L}_{u}$
   $\frac {v^2}{ 2g\times (f - G)}= \frac {2 \times v^2}{2g \times (f + G)}$
   $(f + G)= 2 (f - G)$
   $3G = f$
   $G = 0.4/3 = 0.1333 = 13.3$ %



4. A vehicle was stopped by fully jamming the brakes. The skid marks measured 9.8 m. The average skid resistance will be ...

   
   

   1. 0.6
   2. 0.5
   3. 0.4
   4. 0.3

   View Answer

   Answer: b
   Braking distance,
   $L= \frac{u^2}{2gf}$
   $v=u-at=u-gft$
   since final velocity, v is zero
   $u = gft$
   $L=\frac{(gft)^2}{2gf}$
   $f= \frac{2L}{g t \times 2}=0.5$



5. Which of the following factors affect the required value of camber?

   
   

   1. The type of pavement surface
   2. The amount of rainfall
   3. Weight of vehicles
   4. Direction od superelevation

   
   Select the correct answer.
   

   1. (1) and (2) only
   2. (2) and (4) only
   3. (1) and (3) only
   4. (2) and (4) only

   View Answer

   Answer: a



6. The design speed of a highway is 60 KMPH. Assuming other data as per IRC recommendations, which one of the following is the approximate adopted lag distance?

   
   

   1. 55 m
   2. 42 m
   3. 46 m
   4. 49 m

   View Answer

   Answer: b
   Lag distance $=0.278 V \times t = 41.7 m$




7. Consider the following statements:

   Excessive camber is not provided on the roads because
   

   1. transverse tilt cause uncomfort
   2. of formation of cross ruts
   3. of likely toppling over highly laden bullock carts
   4. of higher costs involved

   
   Which of these statements are correct?
   

   1. 2, 3 and 4
   2. 1, 3 and 4
   3. 1, 2 and 4
   4. 1, 2 and 3

   View Answer

   Answer: d




8. What is the desired length of the zone of Overtaking sight distance (OSD)?

   
   

   1. 3 OSD
   2. 4 OSD
   3. 5 OSD
   4. 6 OSD

   View Answer

   Answer: c




9. At highway stretches where the required overtaking sight distance cannot be provided, it is advisable to incorporate which one of the following?

   
   

   1. At least twice the safe stopping sight distance
   2. Half the required overtaking sight distance
   3. One-third the required overtaking sight distance
   4. At least three times the safe stopping distance

   View Answer

   Answer: a




10. The relationship between Intermediate sight distance (ISD) and Stopping sight distance (SSD) is ...

    
    

    1. ISD = SSD
    2. ISD = 2 SSD
    3. ISD = 1/2 SSD
    4. ISD = 3 SSD

    View Answer

    Answer: b

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