Explore topic-wise MCQs in Engineering.

If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

Clogging of sewers, is caused due to

The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

An inverted siphon is designed generally for

A rainfall may be classified as acidic if its pH value is less or equal to

The screens are fixed

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is

When drainage to sewage ratio is 20, the peak dry weather flow is

For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

For treating the sewage of a large city, you will recommend

In olden days the type of section adopted in trunk and out fall sewers was

In a fully mechanised composting plant, involves

The non-clog pump which permits solid matter to pass out with the liquid sewage, is

The measurement is not made in square metres in case of

According to ISI method of measurement, the order of the sequence is

The excavation exceeding 1.5 m in width and 10 sq.m in plan area with a depth not exceeding 30 cm, is termed as

The detention period in a septic tank is assumed

While estimating a reinforced cement structure, the omitted cover of concrete is assumed

The assumption on which the trapezoidal formula for volumes is based, is

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.

Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.

The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

The ratio of minimum hourly flow to the average flow of sewage is

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

House connections to the laterals is generally made by

The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

The coagulant widely used for sewage treatment, is

The asbestos cement pipes are generally laid

Chlorination of water is done for the removal of

Flocculated particles do not change their

For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

A syphon is used

u₁ and u₂ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are v₁ and v₂. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

Time of emptying liquid from a hemispherical vessel through an orifice at its bottom, is

A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B. The value of P is :

Critical depth (h) of a channel, is

When drainage is permitted under initially applied normal stress only and full primarily consolidation is allowed to take place, the test is known as

The minimum water content at which the soil retains its liquid state and also possesses a small shearing strength against flowing, is known

The maximum value of effective stress in the past divided by the present value, is defined as over consolidation ratio (OCR). The O.C.R. of an over consolidated clay is

If N_f, N_d and H are total number flow channels, total number of potential drops and total hydraulic head differences respectively, the discharge q through the complete flow is given by (where K is a constant)

The internal molecular attraction of a soil, the cohesion

The quantity of seepage of water through soils is proportional to

If 2% solution of a sewage sample is incubated for 5 days at 20 C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm², the pressure at a depth of 2.5 m, is

The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known

Which one of the following is acid resistant asbestos:

Due to attack of dry rot, the timber

Wrought iron contains carbon about