This set of Hydraulic Machines Questions and Answers for Freshers focuses on ” Classification of Hydraulic Turbines – 2″.
1. Hydraulic turbines are classified based on ____________
a) Energy available at inlet of turbine
b) Direction of flow through vanes
c) Head at inlet of turbine
d) Energy available, Direction of flow, Head at inlet.
View Answer
Explanation: Hydraulic Turbines can be classified on any basis like energy supplied, direction of flow, and head at inlet.
2. Impulse turbine and reaction turbine are classified based on ?
a) Type of energy at inlet
b) Direction of flow through runner
c) Head at inlet of turbine
d) Specific speed of turbine
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Explanation: In impulse turbine, pressure energy firstly converts into kinetic energy but in reaction turbine pressure change of water is present only when it passes through the rotor of the turbine.
3. Tangential flow, axial flow, radial flow turbines are classified based on?
a) Type of energy at inlet
b) Direction of flow through runner
c) Head at inlet of turbine
d) Specific speed of turbine
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Explanation: Different types of flow of water classify turbines into tangential, axial, radial flow.
4. High head, low head and medium head turbines are classified based on
a) Type of energy at inlet
b) Direction of flow through runner
c) Head at inlet of turbine
d) Specific speed of turbine
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Explanation: Different heads of turbines classifies turbines based on their heads, namely Kaplan, Francis, Pelton.
5. Low specific speed, high specific speed and medium specific speed are classified based on
a) Type of energy at inlet
b) Direction of flow through runner
c) Head at inlet of turbine
d) Specific speed of turbine
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Explanation: Different specific speed of turbines classifies turbines based on their heads, namely Kaplan, Francis, Pelton.
6. If energy available at inlet of turbine is only kinetic energy then it is classified based on
a) Type of energy at inlet
b) Direction of flow through runner
c) Head at inlet of turbine
d) Specific speed of turbine
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Explanation: When there is energy such as kinetic energy at inlet, turbines is classified based on their energies at inlet. In this case, it is an impulse turbine.
7. If water flows in radial direction at inlet of runner and leaves axially at outlet then turbine is named as
a) Tangential flow turbine
b) Axial flow turbine
c) Radial flow turbine
d) Mixed flow turbine
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Explanation: In a mixed flow turbine, water enters in radial direction and exits axially.
8. Pelton turbine is operated under_________
a) Low head and high discharge
b) High head and low discharge
c) Medium head and high discharge
d) Medium head and medium discharge
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Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Pelton has high head and low discharge.
9. Kaplan turbine is operated under __________
a) Low head and high discharge
b) High head and low discharge
c) Medium head and high discharge
d) Medium head and medium discharge
View Answer
Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Kaplan has low head and high discharge.
10. Medium specific speed of turbine implies _____________
a) Pelton turbine
b) Kaplan turbine
c) Francis turbine
d) Propeller turbine
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Explanation: Francis turbine is a widely used turbine. It has a medium specific speed.
11. High specific speed of turbine implies that it is___________
a) Francis turbine
b) Propeller turbine
c) Pelton turbine
d) Kaplan turbine
View Answer
Explanation: Kaplan turbines have high specific speeds compared to Francis and Pelton turbines.
Sanfoundry Global Education & Learning Series – Hydraulic Machines.
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