ESE (IES) Mechanical Engineering P1 2013

In a reciprocating pump, air vessels are used to

Consider the following statements pertaining to centrifugal pumps: 1) The inlet to the impeller of a centrifugal pump is always axial, while the outlet may be radially inclined. 2) The impeller may be shrouded on both sides with an eye at the centre and vanes curved backwards. 3) Impeller of double entry type has a balanced radial thrust. 4) Un-shrouded and part shrouded impeller are used only where high efficiency is unimportant. Which of these statements are correct?

A centrifugal pump is fully primed, but on starting it fails to deliver fluid. The probable reasons are listed below: 1) Leaky foot valve or suction line 2) Suction head is very low 3) Insufficient motor speed 4) Damaged or closed delivery valve Which of these reasons are correct?

For a given centrifugal pump

A centrifugal pump is to discharge 0.118 m3/s at speed of 1450 rpm against a head of 25m. The impeller diameter is 25 cm, its width at outlet is 5 cm and manometric efficiency is 75%. The vane angle at outer periphery of impeller is

A turbine is working under a head of 200m. The power developed by the turbine is 100 kW and discharge through the turbine is 0.125 m3/s. In such case, the ratio of unit power to unit discharge for the turbine will be