Hydraulics & Fluid Machineries MCQ Question with Answer

Hydraulics & Fluid Machineries MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 50
Delivery head of a centrifugal pump is

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

Question No : 51
In a Kaplan turbine runner, the numbers of blades are generally between

2 to 4

4 to 8

8 to 16

16 to 24

Question No : 52
The cavitation in reaction turbines is avoided, to a great extent by

Installing the turbine below the tail race level

Using stainless steel runner of the turbine

Providing highly polished blades to the runner

All of the above

Question No : 53
Head developed by a centrifugal pump is

Proportional to diameter of impeller

Proportional to speed of impeller

Proportional to diameter and speed of impeller

None of the above

Question No : 54
Axial flow pump is started with its delivery valve

Kept fully closed

Kept fully open

Irrespective of any position

Kept 50% open

Question No : 55
The efficiency of a Pelton wheel working under constant head ________ with the increase in power.

Remain same

Increases

Decreases

None of these

Question No : 56
A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is

175.4 r.p.m.

215.5 r.p.m.

241.5 r.p.m.

275.4 r.p.m