ESE Prelims 2022 Achievers Quiz 14

A hydroelectric reservoir can supply water continuously at a rate of 100 m³/s. The head is 75 m/. The theoretical power that can be developed is:

Which of the following statement(s) is/are correct about centrifugal pumps:

1) It has flow in radially outward direction.

2) It works on the principle of forced vortex flow.

3) Work is done by water on the impeller.

Water is to be pumped at the rate of 0.025 m³/s from a 4 m deep ground level tank to an overhead tank. The difference in levels of the full tank levels of these tanks is 16 m. What is the approximate power required for operating a 65 % efficient centrifugal pump:

A pump discharges 500 l/s at a total head of 250 m. The drive motor delivers 150 KW of power to the pump. At what efficiency is the pump operating?

The following statements pertain to the operation of centrifugal pumps

S1: Pumps in series operation allow the head to increase.

S2: Pumps in series operation increase the flow rate.

S3: Pumps in parallel operation increase the flow rate.

S4: Pumps in parallel operation allow the head to increase.

Identify the correct statements.

Which of the following is NOT true about longitudinal joints in rigid pavements?

Select the correct statements about warping stress in rigid pavements? Warping stresses are

i. caused due to seasonal variations

ii. caused due to daily variations

iii. temperature dependent

iv. a function of friction between the pavement and the layer below

Which of the following are types of transverse joints in rigid pavements?

i. Expansion joint

ii. Contraction joint

iii. Construction joint

Assertion(A): The stress at the top of pavement in the interior region in winters due to wheel load is compressive.

Reason(R): The frictional stress in winters at the top of the pavement is tensile.

Which of the following are the components of rigid pavements?

i. Soil subgrade

ii. Granular sub base

iii. Concrete slab

iv. Surface course