AE_LSGD

Population equivalent is a measure of
2021

  • Population growth

  • Purity of water

  • Strength of sewage

  • Strength of sewage

  • Flocculation

Solution

Population equivalent is a measure of strength of sewage produced by a factory.

AE_LSGD

Which of the following is not a method for disinfection?
2021

  • Boiling

  • Ozone treatment

  • Chlorination

  • Flocculation

  • Flocculation

Solution

Flocculation cannot kill any microorganisms. It is used to remove the suspended particles.

AE_LSGD

The equalization tanks are provided
2021

  • To balance the head loss

  • For removing bigger suspended matter in sewage

  • To balance fluctuating flows or concentrations

  • None of the above

  • To balance fluctuating flows or concentrations

Solution

The equalization tanks are provided to balance fluctuating flows or concentrations, temperature, pH value, etc

AE_LSGD

In Slow Sand Filters the effective size of filter sand ranges between
2021

  • 4 to 4.75 mm

  • 2 to 4 mm

  • 0.2 to 0.4 mm

  • 0.05 to 0.1 mm

  • 0.2 to 0.4 mm

Solution

Effective size of filter sand in slow sand filter ranges from 0.2-0.35 mm Effective size of filter sand in slow sand filter ranges from 0.35-0.5 mm

AE_LSGD

Hardy-Cross Method consists of assuming a distribution of flow in the network in such a way that
2021

  • The principle of continuity is satisfied at each joint

  • The principle of continuity is satisfied at each junction

  • There can be discontinuity in pressure

  • There can be discontinuity in velocity

  • The principle of continuity is satisfied at each junction

Solution

One of the assumption used in solving a flow distribution problem using Hardy-Cross Method is that, continuity equation is satisfied at each junction

AE_LSGD

Geometric increase method of population forecasting is based on the assumption that
2021

  • Growth rate is progressively increasing

  • Growth rate is constant

  • Percentage growth rate is increasing

  • Percentage growth rate is constant

  • Percentage growth rate is constant

Solution

Geometric increase method of population forecasting is based on the assumption that percentage growth rate is constant Arithmetic increase method of population forecasting is based on the assumption that growth rate is constant Incremental increase method of population forecasting is based on the assumption that growth rate is progressively increasing

AE_LSGD

When the length of a connection increases, the shear lag effect
2021

  • Increases

  • Reduces

  • Has no change

  • None of the above

  • Reduces

Solution

Shear lag effect occurs when an angle is connected to a gusset plate, one lug of angle is connected to the plate, whereas the other lug will be outstanding member. To reduce the shear lag, a lug angle will be connected below the angle section. This increases the length of connection, which causes the shear lag effect to reduce.

AE_LSGD

As per IS 800, the partial safety factor for materials γm is in the range
2021

  • 1.1 to 1.5

  • 1.0 to 1.25

  • 1.25 to 2.0

  • 1.0 to 1.5

  • 1.1 to 1.5

Solution

As per IS 800, the partial safety factor for materials γm is in the range 1.1 to 1.5

AE_LSGD

A post-tensioned prestressed concrete beam consists of a single tendon of area 100 mm2. If the stress in concrete at the level of steel is 6 N/mm2 and modular ratio is 6, the loss in prestress due to elastic shortening is
2021

  • 6 N/mm2

  • 36 N/mm2

  • 1 N/mm2

  • 0 N/mm2

  • 0 N/mm2

Solution

In post tensioning, when all the cables are simultaneously tensioned, loss due to elastic shortening will not occur. It occurs only when cables are tensioned step-by-step. Here there is only one tendon & hence there is no step-by-step tensioning of cables. Thus loss due to elastic shortening is zero

AE_LSGD

Which of the following is not a cause for immediate loss in the case of prestressed concrete ?
2021

  • Elastic shortening

  • Friction

  • Anchorage slip

  • Relaxation

  • Relaxation

Solution

Losses due to elastic shortening, friction and anchorage slip are immediate losses whereas loss due to relaxation of steel occurs gradually over time

AE_LSGD

For pre-tensioned prestressed concrete, the grade of concrete shall be not less than
2021

  • M45

  • M40

  • M35

  • M30

  • M40

Solution

As per IS 1343, grade of concrete for pre-tensioned prestressed concrete shall be not less than M40

AE_LSGD

The minimum eccentricity to be considered in the design of a long RCC column is
2021

  • 25 mm

  • 20mm

  • 5mm

  • 10mm

  • 20mm

Solution

As per IS 456:2000, minimum eccentricity to be considered in the design of a long RCC column is 20 mm

AE_LSGD

Aquatic life in a stream begin to be reduced as dissolved oxygen drops below
2021

  • 0.4 mg/l

  • 4 mg/l

  • 10 mg/l

  • 12 mg/l

  • 4 mg/l

Solution

Solution Minimum DO required for aquatic life to survive in water is 4 ppm or 4 mg/l

AE_LSGD

Capacity of a primary settling tank to treat a sewage of 12 million litres per day, by assuming a detention period of 2 hours is
2021

  • 200 m3

  • 100 m3

  • 2000 m3

  • 1000 m3

  • 1000 m3

Solution

Given, Q = 12 x 106 l/day = 12000 m3/day Volume = Q x detention period = 12000 x 2/24 = 1000 m3

AE_LSGD

In an Imhoff tank, the incoming sewage is
2021

  • Allowed to mix with settled sludge

  • Not allowed to mix with settled sludge

  • Allowed to mix with activated sludge

  • Not allowed to mix with activated sludge

  • Not allowed to mix with settled sludge

Solution

In Imhoff tank, the incoming sewage is not allowed to mix with settled sludge. In septic tank, the incoming sewage is allowed to mix with settled sludge.

AE_LSGD

In an upflow anaerobic sludge blanket reactor, the ratio of reactor volume (V) to flow rate (Q) is called
2021

  • Hydraulic Retention Time

  • Solid Retention Time

  • Sludge Retention Time

  • Blanket Retention Time

  • Hydraulic Retention Time

Solution

Ratio of reactor volume (V) to flow rate (Q) is called Hydraulic Retention Time or Hydraulic Detention Time.

AE_LSGD

The minimum reinforcement required for RCC tank walls, using mild steel is
2021

  • 0.64%

  • 0.35%

  • 0.15%

  • 0.12%

  • 0.64%

Solution

As per IS 3370-2:2009, minimum reinforcement required for RCC tank walls, using mild steel is 0.64% and minimum reinforcement required for RCC tank walls, using HYSD bars is 0.35%

AE_LSGD

As per IS 3370, parts of RCC structure retaining the liquid or enclosing the space above the liquid shall be considered as subject to at least
2021

  • Mild exposure condition

  • Moderate exposure condition

  • Severe exposure condition

  • Very severe exposure condition

  • Severe exposure condition

Solution

As per IS 3370-1:2009, Cl 4, parts of the structure retaining the liquid or enclosing the space above the liquid shall be considered as subject to severe condition as per IS 456

AE_LSGD

An RCC water tank to be designed for a volume of 25 m3, not located in coastal area. As per Indian standards, the minimum possible grade of concrete is
2021

  • M20

  • M25

  • M30

  • M35

  • M25

Solution

As per IS 3370-1:2009, Table 1 (notes), for small capacity tanks up to 50m3 at locations where there is difficulty in providing M30 grade concrete, the minimum grade of concrete may be taken as M25

AE_LSGD

For a column with diameter 180 mm and reinforcing bars 12 mm, minimum possible clear cover is
2021

  • 20 mm

  • 25 mm

  • 30 mm

  • 40 mm

  • 25 mm

Solution

As per IS 456:2000, Cl:26.4.2.1, for columns of minimum dimension of 200 mm or under, whose reinforcing bars do not exceed 12mm, a nominal cover of 25 mm may be used

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