# Hydraulic Machines Questions and Answers – Workdone by Kaplan Turbine

This set of Basic Hydraulic Machines Questions and Answers focuses on “Workdone by Kaplan Turbine”.

1. Kaplan turbine works on________
a) Electrical energy
b) Hydro energy
c) Thermal energy
d) Chemical energy

Explanation: Turbine is a vortex related device. It means turbulence. Turbine is a rotary mechanical device. Kaplan turbine is also called as a water turbine. It works when the blades are adjustable.

2. Kaplan turbine is an ______ reaction turbine
a) Inward flow
b) Outward flow
d) Axial

Explanation: Turbine extracts energy and converts it into useful work. Kaplan turbine is an inward flow reaction turbine. It is one of the most efficient turbines to drive electricity.

3. The Kaplan Turbine is an evolution of ________
a) Francis turbine
b) Pelton wheel
c) Parsons turbine
d) Curtis turbine

Explanation: The Kaplan Turbine is an evolution of Francis turbine. It was invented for an essential purpose. It allowed efficient power production in low head applications. Thus, making it better than Francis.

4. What is the dimension of thermal efficiency of a Kaplan turbine?
a) kg
b) m
c) kg/m
d) Dimensionless

Explanation: Thermal efficiency in thermodynamics is a dimensionless performance. It is a device that is used to measure thermal energy. It is mainly used in internal combustion engines.

5. A Kaplan turbine is used in ________
a) Turbomachinery
b) Pressure drag
c) Aerodynamics
d) Automobiles

Explanation: A Kaplan turbine is a turbomachinery. Turbine extracts energy from fluid flow and converts it into useful work. Turbine is a vortex related device. It means turbulence. Turbine is a rotary mechanical device.
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6. The head of the Kaplan ranges from ______
a) 100 to 200 m
b) 250 to 300 m
c) 10 to 70 m
d) 0 m

Explanation: The head of the Kaplan ranges from 10 meters to 70 meters. A Kaplan turbine is a turbomachinery. Turbine extracts energy from fluid flow and converts it into useful work. Turbine is a vortex related device.

7. Nozzles in the Kaplan turbine move due to impact of ________
a) Water
b) Steam
d) Another nozzle

Explanation: Nozzle is moved due to the impact of steam. When the steam hits the nozzle, the pressure is decreased and the temperature is increased.

8. The power output of Kaplan turbine ranges from__________
a) 5 to 200 MW
b) 1000 to 2000 MW
c) 2000 to 3000 MW
d) 5000 and above

Explanation: The power output of Kaplan turbine ranges from 5 mega Watt to 200 mega Watt. It has got runner diameters which ranges from 2 meters to 11 meters. It varies from place to place.

9. Kaplan turbines rotates at a ________ rate
a) Increasing
b) Decreasing
c) Constant
d) Increasing and then decreasing

Explanation: Kaplan turbines rotates at a constant rate. A Kaplan turbine is a turbomachinery. Turbine extracts energy from fluid flow and converts it into useful work. Turbine is a vortex related device.

10. What type of turbine is Kaplan?
a) Impulse
b) Reaction
c) Energy
d) Hydro

Explanation: Kaplan turbine is a reaction turbine. It extracts energy from fluid flow and converts it into useful work. Kaplan turbine is a vortex related device.

11. Kaplan turbine is needed to improve ________
a) Increase Pressure
b) Decrease temperature
c) Change volume
d) Increase efficiency

Explanation: Kaplan turbine is needed to improve efficiencies at low speeds. When we arrange turbine blades in multiple stages. It plays an essential role in turbines.

12. Kaplan turbine is an ________ type turbine
a) Pressure
b) Inward flow
c) Outward flow
d) Velocity

Explanation: Kaplan turbine is an inward flow reaction turbine. It means that the working fluid changes its pressure as it moves through the turbine and gives up its energy.

13. The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full.
a) True
b) False

Explanation: The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full. A higher turbine located increases the suction and is imparted on the turbine blades by the draft tube.

14. The outlet of the Kaplan turbine is through _______
b) Moving pipeline
c) Draft tube
d) Pump

Explanation: The outlet of the Kaplan turbine is through draft tube. It is a specially shaped tube that helps to decelerate the water and recover its kinetic energy. It happens at a faster rate.

15. Kaplan turbine is most commonly used in propeller turbines.
a) True
b) False

Explanation: Kaplan turbine is most commonly used in propeller turbines. Since, the Kaplan turbines have non-adjustable propeller vanes it is most commonly used. They are used in a wide rage if flow and for other commercial products.

Sanfoundry Global Education & Learning Series – Hydraulic Machines.

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