The maximum number of jets generally employed in impulse turbine without jet interference is________________?

Related Mcqs:

1. Impulse turbine is generally fitted______________________?

   A. at the level of tail race
   B. little above the tail race
   C. slightly below the tail race
   D. about 2.5 m above the tail race to avoid cavitation
   E. about 2.5 m below the tail race to avoid cavitation

2. Maximum impulse will be developed in hydraulic ram when ___________________?

   A. waste valve closes suddenly
   B. supply pipe is long
   C. supply pipe is short
   D. ram chamber is large
   E. supply pipe has critical diameter

3. High specific speed of turbine implies it is__________________?

   A. propeller turbine
   B. Francis turbine
   C. impulse turbine
   D. any one of the above
   E. none of the above

4. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between_________________?

   A. lift and resultant force
   B. drag and resultant force
   C. lift and tangential force
   D. lift and drag
   E. resultant force and tangential force

5. Which place in hydraulic turbine is most susceptible for cavitation __________________?

   A. inlet of draft rube
   B. blade inlet
   C. guide blade
   D. penstock
   E. draft tube exit

6. Francis turbine is best suited for_____________________?

   A. medium head application from 24 to 180 m
   B. low head installation up to 30 m
   C. high head installation above 180 m
   D. all types of heads
   E. none of the above

7. In reaction turbine, draft tube is used_____________________?

   A. to transport water downstream without eddies
   B. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
   C. for safety of turbine
   D. to increase flow rate
   E. none of the above

8. A turbine pump is basically a centrifugal pump equipped additionally with_________________?

   A. adjustable blades
   B. backward curved blades
   C. vaned diffusion casing
   D. inlet guide blades
   E. totally submerged operation facility

9. The specific speed of turbine is defined as the speed of a unit___________________?

   A. of such a size that it delivers unit dis-charge at unit head
   B. of such a size that it delivers unit dis-charge at unit power
   C. of such a size that it requires unit power per unit head
   D. of such a size that it produces unit horse power with unit head
   E. none of the above

10. Low specific speed of turbine implies it is__________________?

    A. propeller turbine
    B. Francis turbine
    C. impulse turbine
    D. any one of the above
    E. none of the above