Mechanical Engineering Hydraulic Machines Online Test

Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

The mechanical efficiency of an impulse turbine is

The overshot water wheels are those in which the wheel runs entirely by the __________ of water.

In a Kaplan turbine runner, the number of blades are generally between

Discharge of a centrifugal pump is

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

The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.

The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.

Geometric similarity is said to exist between the model and the prototype, if both of them

In a reaction turbine, the draft tube is used

The power produced by the reaction turbine is __________ to the head of water.

Slip of a reciprocating pump is defined as the

The efficiency of a centrifugal pump will be maximum when the blades are bent backward.

Multi-stage centrifugal pumps are used to

The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

Which of the following pump is preferred for flood control and irrigation applications?

The efficiency of a Pelton wheel working under constant head __________ with the increase in power.

The discharge of a centrifugal pump working under constant head __________ with the speed.

Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.

Which of the following turbine is preferred for 0 to 25 m head of water?

The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.

The overall efficiency of a reaction turbine is the ratio of

Work done by a turbine __________ upon the weight of water flowing per second.

The maximum number of jets, generally, employed in an impulse turbine without jet interference are

In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.

A Francis turbine is used when the available head of water is

The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

A hydraulic coupling belongs to the category of