# Hydraulics & Fluid Machineries MCQ - Multiple Choice Question and Answer

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

Question No : 22
Impulse turbine is generally fitted

At the level of tail race
Little above the tail race
Slightly below the tail race
About 2.5 m above the tail race to avoid cavitations.

Question No : 23
Casting of a centrifugal pump is designed so as to minimize

Friction loss
Cavitations
Loss of kinetic energy

Question No : 24
A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is

10 r.p.m.
20 r.p.m.
40 r.p.m.
80 r.p.m.

Question No : 25
Hydraulic accumulator is used for

Accumulating oil
Supplying large quantities of oil for very short duration
Generally high pressures to operate hydraulic machines
Supplying energy when main supply fails

Question No : 26
The static head of a centrifugal pump is equal to the ________ of suction head and delivery head.

Product
Difference
Sum
None of these

Question No : 27
In reaction turbine, draft tube is used

To transport water downstream without eddies
To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
For safety of turbine
To increase flow rate

Question No : 28
A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

0.25 kW
0.75 kW
1.75 kW
3.75 kW