Two

Four

Six

Eight

C. Six

They have slow speeds

They are suitable even for low water heads

They give constant efficiency, even if the discharge is not constant

All of the above

24.8 r.p.m.

48.2 r.p.m

82.4 r.p.m.

248 r.p.m

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

No flow will take place

Cavitation will be formed

Efficiency will be low

Excessive power will be consumed

Kinetic head

Velocity head

Manometric head

Static head

Ratio of actual discharge to the theoretical discharge

Sum of actual discharge and the theoretical discharge

Difference of theoretical discharge and the actual discharge

Product of theoretical discharge and the actual discharge

An axial flow

An inward flow

An outward flow

A mixed flow

Inlet of draft rube

Blade inlet

Guide blade

Penstock

waV/2g × sinθ

waV/g × sinθ

waV²/2g × sin2θ

waV²/g × sinθ

Centrifugal pump

Mixed flow pump

Axial flow pump

Any one of the above

Impulse turbines

Reaction turbines

Axial flow turbines

Mixed flow turbines

10 r.p.m.

20 r.p.m.

40 r.p.m.

80 r.p.m.

Directly proportional to N

Inversely proportional to N

Directly proportional to N²

Inversely proportional to N²

Geometric similarity

Kinematic similarity

Dynamic similarity

None of these

Proportional to diameter of impeller

Proportional to speed of impeller

Proportional to diameter and speed of impeller

None of the above

Pelton wheel

Francis turbine

Kaplan turbine

None of these

Centrifugal pump

Reciprocating pump

Jet pump

Air lift pump

Have identical velocities

Are equal in size and shape

Are identical in shape, but differ only in size

None of the above

40 %

50 %

60 %

80 %

Manometric efficiency

Mechanical efficiency

Overall efficiency

Volumetric efficiency

0.15 to 0.3

0.4 to 0.5

0.6 to 0.9

1 to 1.5

Power produced by the turbine to the energy actually supplied by the turbine

Actual work available at the turbine to energy imparted to the wheel

Workdone on the wheel to the energy (or head of water) actually supplied to the turbine

None of the above

Closed

Open

Depends on starting condition and flow desired

Could be either open or closed

Centrifugal pump

Reciprocating pump

Jet pump

Airlift pump

L.A.N

2 L.A.N

(L.A.N)/60

(2 L.A.N)/60

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above

^{1/2}

^{1/2}

^{3/2}

^{3/2}

Directly proportional to diameter of its impeller

Inversely proportional to diameter of its impeller

Directly proportional to (diameter)² of its impeller

Inversely proportional to (diameter)² of its impeller

Radially, axially

Axially, radially

Axially, axially

Radially, radially

Two jets

Two runners

Four jets

Four runners