GATE CE 2018 Paper 1 — page 15

Questions 43–45 of 65. Imported answers require review unless explicitly marked reviewed.

A rapid sand filter comprising a number of filter beds is required to produce 99 MLD of potable water. Consider water loss during backwashing as 5%, rate of filtration as 6.0 m/h and length to width ratio of filter bed as 1.35. The width of each filter bed is to be kept equal to 5.2 m. One additional filter bed is to be provided to take care of break-down, repair and maintenance. The total number of filter beds required will be

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A priority intersection has a single-lane one-way traffic road crossing an undivided two-lane two-way traffic road. The traffic speed on the single-lane road is 20 kmph and the speed on the two-lane road is 50 kmph. The perception-reaction time is 2.5 s, coefficient of longitudinal friction is 0.38 and acceleration due to gravity is 9.81 m/s

. A clear sight triangle has to be ensured at this intersection. The minimum lengths of the sides of the sight triangle along the two-lane road and the single-lane road, respectively will be

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50 m and 20 m

61 m and 18 m

111 m and 15 m

122 m and 36 m

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The following details refer to a closed traverse:

Line	Northing (m)	Southing (m)	Easting (m)	Westing (m)
PQ	---	437	173	---
QR	101	---	558	---
RS	419	---	---	96
SP	---	83	---	634

The length and direction (whole circle bearing) of closure, respectively are

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1 m and 90°

2 m and 90°

1 m and 270°

2 m and 270°

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2018 · Paper 1

Question 33

Question 34

Question 35