GATE CE topic:civil-engineering PYQs & Answers — Page 26

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Questions 251–260 of 1300. Imported answers require independent review unless marked reviewed.

Topic practice 1300 questionsPage 26 of 130

A symmetrical trapezoidal canal is 100 km long. The bottom width is 10 m and the side slope is 1 Horizontal : 1 Vertical. The average flow depth in the canal is 2.5 m throughout the month of April. The measurement from a Class-A evaporimeter in the vicinity of the canal indicated an average evaporation rate of 0.5 cm/day in April.

The volume of water evaporated from the canal (in m³) in the month of April is close to __________ ×10³ (rounded off to 1 decimal place).

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The analyses results of a water sample are given below. The non-carbonate hardness of the water (in mg/L) as CaCO

is ______ (in integer).

= 150 mg/L as CaCO

= 40 mg/L as CaCO

= 10 mg/L as CaCO

= 50 mg/L as CaCO

= 10 mg/L as CaCO

= 120 mg/L as CaCO

HCO

= 30 mg/L as CaCO

= 50 mg/L as CaCO

; Other anions were not analysed.

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A 5.0 m wide rectangular channel carries a discharge of 10 m³/s at a depth of 1.5 m under uniform flow. To produce critical flow conditions without affecting the upstream conditions, the channel bottom elevation should be raised (in m) by __________ (rounded off to 2 decimal places).

Assume that there is no loss of head at the raise, kinetic energy correction factor is 1.0, and acceleration due to gravity is 9.81 m/s².

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A community generates 1 million litres/day (MLD) of wastewater. This wastewater is treated using activated sludge process (ASP). The working volume of the aeration tank of the ASP is 250 m

, and the biomass concentration in the tank is 3000 mg/L. Analyses results showed that a biomass concentration of 100 mg/L is present in the treated effluent from the secondary sedimentation tank of the ASP. Sludge wastage from the system is at a rate of 5000 L/day with a biomass concentration of 1000 mg/L. The system is in steady state condition.

The biological sludge residence time (BSRT) of the system (in days) is ______ (round off to one decimal place).

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A one-way, single lane road has traffic that consists of 30% trucks and 70% cars. The speed of trucks (in km/h) is a uniform random variable on the interval (30, 60), and the speed of cars (in km/h) is a uniform random variable on the interval (40, 80). The speed limit on the road is 50 km/h. The percentage of vehicles that exceed the speed limit is __________ (rounded off to 1 decimal place).

Note: X is a uniform random variable on the interval (α, β), if its probability density function is given by

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A settling chamber is used for the removal of discrete particulate matter from air with following conditions. Horizontal velocity of air = 0.2 m/s; Temperature of air stream = 77°C; Specific gravity of particle to be removed = 2.65; Chamber length = 12 m; Chamber height = 2 m; Viscosity of air at 77°C = 2.1 x 10

kg/m.s; Acceleration due to gravity (g) = 9.81 m/s

; Density of air at 77°C =1.0 kg/m

; Assume the density of water as 1000 kg/m

and Laminar condition exists in the chamber.

The minimum size of particle that will be removed with 100% efficiency in the settling chamber (in

m) is ______ (round off to one decimal place).

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In leveling between two points A and B on the opposite banks of a river, the readings are taken by setting the instrument both at A and B, as shown in the table. If the RL of A is 150.000 m, the RL of B (in m) is __________ (rounded off to 3 decimal places).

Level position	Staff readings A	Staff readings B
A	1.800	1.350
B	1.450	0.950

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On a two-lane highway, a horizontal curve of radius 300 m is provided. The design speed is 80 km/h.

If the long wheelbase of vehicle expected on this highway is 7 m, then the extra widening required (in m) is ______ (round off to two decimal places).

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During determination of the bulk specific gravity of compacted bituminous specimen, the mass in air of the specimen is 1260 g and volume is 525 cm³. The density of water is 1.0 g/cm³. The theoretical maximum specific gravity of mix is 2.510.

The percentage air void in the compacted specimen is __________ (rounded off to 2 decimal places).

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If the Fore Bearing of the lines AB and BC are 60° and 122°, respectively, then the interior angle ∠ABC (in degrees) is ______ (round off to the nearest integer).

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GATE CE topic:civil-engineering PYQs

Question 61

Question 61

Question 62

Question 62

Question 63

Question 63

Question 64

Question 64

Question 65

Question 65