MCQOPTIONS
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MCQOPTIONS
This section includes 19 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. |
In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________ |
| A. | 90.14% |
| B. | 80% |
| C. | 70% |
| D. | 85% |
| Answer» B. 80% | |
| 2. |
The expression for hydraulic efficiency is given by |
| A. | 2(V1-u)[1+cos k]u/V1*V1 |
| B. | 2(V1+u)[1+cos k]u/V1*V1 |
| C. | 2(V1-u)[1-cos k]u/V1*V1 |
| D. | 2(V1+u)[1+cos k]u/V1*V1 |
| Answer» B. 2(V1+u)[1+cos k]u/V1*V1 | |
| 3. |
In Pelton turbine hydraulic efficiency is product of mechanical efficiency and overall efficiency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as _______ |
| A. | Specific density of liquid |
| B. | Density of liquid |
| C. | Specific gravity of liquid |
| D. | Volume of liquid |
| Answer» C. Specific gravity of liquid | |
| 5. |
The expression for maximum hydraulic efficiency of Pelto turbine is given by ______________ |
| A. | (1+cos k)/2 where k is outlet blade angle |
| B. | (2+cos k)/2 where k is outlet blade angle |
| C. | (3+cos k)/2 where k is outlet blade angle |
| D. | (4+cos k)/2 where k is outlet blade angle |
| Answer» B. (2+cos k)/2 where k is outlet blade angle | |
| 6. |
In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine. |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» C. Hydraulic efficiency | |
| 7. |
In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine. |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 8. |
IN_PELTON_TURBINE_HYDRAULIC_EFFICIENCY_IS_PRODUCT_OF_MECHANICAL_EFFICIENCY_AND_OVERALL_EFFICIENCY.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________$ |
| A. | 90.14% |
| B. | 80% |
| C. | 70% |
| D. | 85% |
| Answer» B. 80% | |
| 10. |
The expression for hydraulic efficiency is given by$ |
| A. | 2(V1-u)[1+cos k]u/V1*V1 |
| B. | 2(V1+u)[1+cos k]u/V1*V1 |
| C. | 2(V1-u)[1-cos k]u/V1*V1 |
| D. | 2(V1+u)[1+cos k]u/V1*V1 |
| Answer» B. 2(V1+u)[1+cos k]u/V1*V1 | |
| 11. |
In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as ______?# |
| A. | Specific density of liquid |
| B. | Density of liquid |
| C. | Specific gravity of liquid |
| D. | Volume of liquid |
| Answer» C. Specific gravity of liquid | |
| 12. |
The expression for maximum hydraulic efficiency of Pelto turbine is given by _____________? |
| A. | (1+cos k)/2 where k is outlet blade angle |
| B. | (2+cos k)/2 where k is outlet blade angle |
| C. | (3+cos k)/2 where k is outlet blade angle |
| D. | (4+cos k)/2 where k is outlet blade angle |
| Answer» B. (2+cos k)/2 where k is outlet blade angle | |
| 13. |
In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is _______ |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» E. | |
| 14. |
In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» C. Hydraulic efficiency | |
| 15. |
Among the following which turbine has least efficiency? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» B. Kaplan turbine | |
| 16. |
In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as _____________ |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» E. | |
| 17. |
The maximum efficiency of Pelton turbine is _________ |
| A. | 80% |
| B. | 70% |
| C. | 50% |
| D. | 88% |
| Answer» D. 88% | |
| 18. |
In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 19. |
The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to _______ |
| A. | V/2 |
| B. | V/3 |
| C. | V/4 |
| D. | V/5 |
| Answer» B. V/3 | |