

MCQOPTIONS
Saved Bookmarks
This section includes 29 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulic Machines knowledge and support exam preparation. Choose a topic below to get started.
1. |
Pelton wheel is a Reaction type water turbine. |
A. | True |
B. | False |
Answer» C. | |
2. |
The Pelton wheel extracts energy from________ |
A. | Vane angle |
B. | Moving fluid |
C. | Increase in temperature |
D. | Heat rejection |
Answer» C. Increase in temperature | |
3. |
Before reaching the turbine, the acceleration of the fluid takes place through the__________ |
A. | Vane angle |
B. | Nozzle |
C. | Pump |
D. | Pipe |
Answer» C. Pump | |
4. |
In an outward flow reaction turbine the discharge _______ |
A. | Increases |
B. | Decreases |
C. | Same |
D. | Independent |
Answer» B. Decreases | |
5. |
In impulse turbines with stationary blades, there is_________ in blades of the turbine. |
A. | Pressure change |
B. | Same pressure |
C. | Volumetric change |
D. | Pressure independent |
Answer» B. Same pressure | |
6. |
In impulse turbines with moving blades, there is no _________ in blades of the turbine. |
A. | Pressure change |
B. | Same pressure |
C. | Volumetric change |
D. | Pressure independent |
Answer» B. Same pressure | |
7. |
A working fluid contains kinetic energy only. |
A. | True |
B. | False |
Answer» C. | |
8. |
In an inward flow reaction turbine the discharge _______ |
A. | Increases |
B. | Decreases |
C. | Same |
D. | Independent |
Answer» C. Same | |
9. |
Where is the turbine not used? |
A. | Solar power |
B. | Windmill |
C. | Water wheels |
D. | Gas plant |
Answer» B. Windmill | |
10. |
Centrifugal flow is imparted when the__________ |
A. | Reaction flow is negative |
B. | Reaction flow is positive |
C. | Efficiency is 100 percent |
D. | Reaction rate is negligible |
Answer» D. Reaction rate is negligible | |
11. |
Inward flow reaction turbine enter through ______ |
A. | Outer periphery |
B. | Blades |
C. | Inner periphery |
D. | Pressure angle |
Answer» B. Blades | |
12. |
Turbine extracts energy from________ |
A. | Reaction ratio |
B. | Pressure ratio |
C. | Fluid flow |
D. | Volumetric ratio |
Answer» D. Volumetric ratio | |
13. |
Turbine converts _________ |
A. | Work to energy |
B. | Energy to work |
C. | Work to Electricity |
D. | Work to pressure |
Answer» C. Work to Electricity | |
14. |
A turbine is a ________ |
A. | Rotary mechanical device |
B. | Static pressure drop device |
C. | Electrical device |
D. | Static temperature device |
Answer» B. Static pressure drop device | |
15. |
Degree of reaction for reaction turbine is _____________ |
A. | 1- cot x /2(cot x –cot y) |
B. | 1+ cot x /2(cot x –cot y) |
C. | 1- cot x /2(cot x +cot y) |
D. | 1+ cot x /2(cot x +cot y) |
Answer» B. 1+ cot x /2(cot x –cot y) | |
16. |
The formula for degree of reaction for hydraulic turbines is __________ |
A. | 1- (V1*V1-V2*V2)/(V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
B. | (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
C. | 1+ (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
D. | 1- (V2*V2-V1*V1)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) |
Answer» B. (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1) | |
17. |
Degree of reaction for impulse turbine |
A. | 0 |
B. | 1 |
C. | 2 |
D. | 3 |
Answer» B. 1 | |
18. |
___________is ratio of pressure energy change inside runner to total energy change inside runner |
A. | Degree of reaction |
B. | Speed ratio |
C. | Flow ratio |
D. | Hydraulic efficiency |
Answer» B. Speed ratio | |
19. |
An outward flow reaction turbine, ________ |
A. | D1 > D2 |
B. | D1 < D2 |
C. | D1 = D2 |
D. | D1 = D2 = 0 |
Answer» C. D1 = D2 | |
20. |
An outward radial reaction turbine has ______ |
A. | u1 < u2 |
B. | u1 > u2 |
C. | u1 = u2 |
D. | u2 = u1 = 0 |
Answer» B. u1 > u2 | |
21. |
Discharge in an outward flow reaction turbine ____________ |
A. | Increases |
B. | Decreases |
C. | Remains constant |
D. | Gradually decreases |
Answer» B. Decreases | |
22. |
In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is ______ |
A. | Speed ratio |
B. | Flow ratio |
C. | Discharge |
D. | Radial discharge |
Answer» B. Flow ratio | |
23. |
In an outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as ___________ |
A. | Speed ratio |
B. | Flow ratio |
C. | Discharge |
D. | Radial discharge |
Answer» C. Discharge | |
24. |
In outward radial flow reaction turbines, tangential velocity at inlet is less than that of the outlet. |
A. | False |
B. | True |
Answer» C. | |
25. |
___________ is a circular wheel on which a series of smooth, radial curved vanes are fixed. |
A. | Guide wheel |
B. | Runner |
C. | Casing |
D. | Draft tube |
Answer» C. Casing | |
26. |
In general, reaction turbines consist of which types of energies? |
A. | kinetic energy and potential energy |
B. | potential energy and pressure energy |
C. | kinetic energy and pressure energy |
D. | gravitational energy and potential energy |
Answer» D. gravitational energy and potential energy | |
27. |
If the water flows from inwards to outwards, the turbine is known as _____________ |
A. | Tangential flow turbine |
B. | Turbulent low inward flow |
C. | Inward flow turbine |
D. | Outward flow turbine |
Answer» E. | |
28. |
The water from penstocks enters the _____ which is spiral in shape which the area of cross section of casing goes on decreasing gradually |
A. | guide wheel |
B. | draft tube |
C. | casing |
D. | runner |
Answer» D. runner | |
29. |
In an outward flow reaction turbine, water from casing enters guiding wheel. |
A. | True |
B. | False |
Answer» B. False | |