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# PPSC CE_TRANSPORTATION_QUIZ 1 (App update required to attempt this test)

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Question 1

On what factors does stopping sight distance depends?

1. Speed of vehicle
2. longitudinal friction coefficient
3. braking efficiency
4. Reaction time

Question 2

Calculate the safe stopping sight distance (in m) for the descending gradient of 3% for a design speed of 80 km/h. Take coefficient of friction as 0.35 and total reaction time as 2 seconds.

Question 3

Calculate the lag distance for a design speed of 65 km/hr assuming the coefficient of friction as 0.36 and total reaction time of driver as 2.5 seconds?

Question 4

Assuming a longitudinal coefficient of friction to be 0.5, the resulting retardation of a vehicle being brought to stop is, nearly (only magnitude)

Question 5

If a descending gradient of 1 in 25 meets an ascending gradient of 1 in 40, then the length of valley curve required for a head light sight distance of 100 m will be(m)

Question 6

A valley curve is formed by a descending gradient of 1 in 30 meeting an ascending gradient of 1 in 20. Calculate the length of valley curve for comfort condition if design speed on the curve is 70 kmph. Assume coefficient of centrifugal acceleration to be 0.54 m/s3.
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