Delivery head of a centrifugal pump is directly proportional to N inversely prop

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Mechanical Engineering ‣ Hydraulic Machines Comments

Correct Answer

directly proportional to N²

Hydraulic Machines problems

Search Results

3. 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
Options
A. 10 r.p.m.
B. 20 r.p.m.
C. 40 r.p.m.
D. 80 r.p.m.

4. The hydraulic efficiency of a reaction turbine, is the ratio of
Options
A. power produced by the turbine to the energy actually supplied by the turbine
B. actual work available at the turbine to energy imparted to the wheel
C. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
D. none of the above

6. The specific speed of a hydraulic turbine depends upon
Options
A. speed and power developed
B. discharge and power developed
C. speed and head of water
D. speed, power developed and head of water

7. Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and ?_o = Overall efficiency of the pump)
Options
A.
B.
C.
D.

8. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
Options
A. 39.2%
B. 48.8%
C. 84.8%
D. 88.4%

Comments

More in Mechanical Engineering: