Hydraulic Turbines and Jets MCQ

41. The specific speed for a turbine is the speed of a geometrically similar turbine which would

1. produce unit power (one kilowatt) under unit head (one meter)
2. produce unit discharge (1 litre/sec) under unit head (one meter)
3. produce unit discharge (1 litre/sec) with unit power (one kilowatt)
4. produce unit head (one meter) with unit power (one kilowatt)

42. Impulse turbine without jet interference employs maximum number of jets are

1. 6
2. 12
3. 4
4. 8

43. The specific speed of a hydraulic turbine depends upon

1. Speed and power developed
2. Discharge and power developed
3. Speed and head of water
4. Speed, power developed and head of water

44. The speed ratio in case of a Francis turbine is varies from

1. 0.4 to 0.5
2. 0.15 to 0.3
3. 1 to 1.5
4. 0.6 to 0.9

45. The overall efficiency for a pelton wheel lies between

1. 0.50 to 0.65
2. 0.65 to 0.75
3. 0.75 to 0.85
4. 0.85 to 0.90

46. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

1. Kaplan turbine
2. Pelton wheel
3. Francis turbine
4. All of the above

47. A turbine is called as a ‘Reaction Turbine’ if at the inlet of turbine the water possesses

1. Kinetic energy
2. Pressure energy
3. Kinetic energy and Pressure energy
4. Kinetic energy and Potential energy

48. Francis turbine is a

1. Axial flow impulse turbine
2. Radial flow reaction turbine
3. Axial flow reaction turbine
4. Radial flow impulse turbine

49. According to the direction of flow through runner, Pelton turbine is

1. Tangential flow impulse turbine
2. Radial flow impulse turbine
3. Axial flow impulse turbine
4. Mixed flow impulse turbine

50. Kaplan turbine is

1. an inmpulse turbine
2. a radial flow impulse turbine
3. an axial flow reaction turbine
4. a radial flow reaction turbine