| Specific speed of a turbine is defined as the speed of a unit of such a size that it |
A) delivers unit discharge at unit head
B) delivers unit discharge at unit power
C) produces unit power for unit head
D) produces unit power from unit discharge
| The range of the Specific Speed of Francis turbine is |
A) 10 – 35 rpm
B) 35 – 60 rpm
C) 60 – 300 rpm
D) 300 – 1000 rpm
| In an outward flow reaction turbine, |
A) The water flows parallel to the axis of wheel.
B) The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel.
C) The water enters the wheel at the outer periphery and then flows towards at the centre of the wheel.
D) The flow of water is partly radial and partly axial.
| The overall efficiency of a turbine is the ratio of the |
A) power developed by the runner of a turbine to the power supplied by the water at the inlet of the turbine
B) power at the shaft of the turbine to the power developed by the runner
C) volume of water actually striking the runner to the volume of water supplied to the turbine
D) power available at the shaft of the turbine to the power supplied by the water at the inlet of the turbine
| ‘Fourneyron’ is a / an |
A) Axial flow turbine
B) Tangential flow turbine
C) Mixed flow turbine
D) Outward radial flow turbine
| A turbine is called as a ‘Reaction Turbine’ if at the inlet of turbine the water possesses |
A) Kinetic energy
B) Pressure energy
C) Kinetic energy and Pressure energy
D) Kinetic energy and Potential energy
| In an impulse turbine |
A) always operates submerged
B) makes use of a draft tube
C) all the available energy of water is converted to kinetic energy
D) converts pressure head into velocity throughout the vanes
| Braking jet in an impulse turbine is used to |
A) break the jet of water.
B) bring the runner to rest in a short time.
C) change the direction of the runner.
D) change the direction of the flow
| Governing of a turbine means |
A) the head is kept constant under all conditions of working
B) the speed is kept constant under all conditions of working
C) the discharge is kept constant under all conditions of working
D) the frictional loss is kept constant under all conditions of working
| Which of the following statement is wrong? |
A) The reaction turbines are used for low head and high discharge.
B) The angle of taper on draft tube is less than 8°
C) An impulse turbine is generally fitted slightly above the tail race.
D) A Francis turbine is an impulse turbine.
