BARC OCES 2022 Quiz 11

Consider the following statements:

1. Velocity potential function exists in rotational flows only.

2. Stream function exists in irrotational flows only.

Which of the above statement(s) is/are correct ?

Operating characteristic curves of a turbine are:

A Kaplan turbine develops 20,000 kW power at an average head of 50m. Assuming overall efficiency of 90%, what would be the discharge through the turbine.

Which of the following turbine is suitable to generate the power of 10,000 hp, working at the speed of 500 rpm under a head of 81 m?

A flash mixer of 1.5 m³, with a velocity gradient of mixing mechanism equal to 500 per second and fluid absolute viscosity 1 x 10^-3 N-s/m² is continuously operated. What is the power input?

Consider the following unit process commonly used in water treatment; Rapid Mixing (RM), Flocculation (F), Primary Sedimentation (PS), Secondary Sedimentation (SS), Chlorination C., and Rapid Sand Filtration (RSF). The order of these unit processes (first to last) in conventional water treatment plant is:

Flocculation is the process of

Out of which process, maximum particles of approximately 1 micron size are best removed?

Which of the following represents the approximately overflow rate (liters/hours/m²) for the plain sedimentation tank?