McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 751. |
In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine? |
| A. | 5 m/s |
| B. | 10 m/s |
| C. | 12.5 m/s |
| D. | 15 m/s |
| Answer» B. 10 m/s | |
| 752. |
The whirl velocity of water at the inlet of the Kaplan turbine is 15 m/s. The velocity of water at inlet of the turbine is 20 m/s. Find the guide vane angle at inlet (In degrees). |
| A. | 53.13 |
| B. | 36.86 |
| C. | 45 |
| D. | 41.41 |
| Answer» D. 41.41 | |
| 753. |
The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine? |
| A. | 26.124 m/s |
| B. | 40 m/s |
| C. | 36.124 m/s |
| D. | 60 m/s |
| Answer» C. 36.124 m/s | |
| 754. |
For the figure given below, find the missing terms in the order of (1), (2), (3) and (4). |
| A. | Vr1, α1, β1, Vw1 |
| B. | Vw1, β1, α1, Vr1 |
| C. | Vw1, α1, β1, Vr1 |
| D. | Vr1, β1, α1, Vw1 |
| Answer» C. Vw1, α1, β1, Vr1 | |
| 755. |
Kaplan turbine works on |
| A. | Electrical energy |
| B. | Hydro energy |
| C. | Thermal energy |
| D. | Chemical energy |
| Answer» C. Thermal energy | |
| 756. |
Kaplan turbine is an reaction turbine |
| A. | Inward flow |
| B. | Outward flow |
| C. | Radial |
| D. | Axial |
| Answer» A. Inward flow | |
| 757. |
The Kaplan Turbine is an evolution of |
| A. | Francis turbine |
| B. | Pelton wheel |
| C. | Parsons turbine |
| D. | Curtis turbine |
| Answer» A. Francis turbine | |
| 758. |
What is the dimension of thermal efficiency of a Kaplan turbine? |
| A. | kg |
| B. | m |
| C. | kg/m |
| D. | Dimensionless |
| Answer» D. Dimensionless | |
| 759. |
A Kaplan turbine is used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 760. |
The head of the Kaplan ranges from |
| A. | 100 to 200 m |
| B. | 250 to 300 m |
| C. | 10 to 70 m |
| D. | 0 m |
| Answer» C. 10 to 70 m | |
| 761. |
Nozzles in the Kaplan turbine move due to impact of |
| A. | Water |
| B. | Steam |
| C. | Blade |
| D. | Another nozzle |
| Answer» B. Steam | |
| 762. |
The power output of Kaplan turbine ranges from |
| A. | 5 to 200 MW |
| B. | 1000 to 2000 MW |
| C. | 2000 to 3000 MW |
| D. | 5000 and above |
| Answer» A. 5 to 200 MW | |
| 763. |
Kaplan turbines rotates at a rate |
| A. | Increasing |
| B. | Decreasing |
| C. | Constant |
| D. | Increasing and then decreasing |
| Answer» C. Constant | |
| 764. |
What type of turbine is Kaplan? |
| A. | Impulse |
| B. | Reaction |
| C. | Energy |
| D. | Hydro |
| Answer» B. Reaction | |
| 765. |
Kaplan turbine is needed to improve |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» D. Increase efficiency | |
| 766. |
Kaplan turbine is an type turbine |
| A. | Pressure |
| B. | Inward flow |
| C. | Outward flow |
| D. | Velocity |
| Answer» B. Inward flow | |
| 767. |
The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 768. |
The outlet of the Kaplan turbine is through |
| A. | Vane Blades |
| B. | Moving pipeline |
| C. | Draft tube |
| D. | Pump |
| Answer» C. Draft tube | |
| 769. |
Kaplan turbine is most commonly used in propeller turbines. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 770. |
For a Kaplan turbine, the whirl velocity at inlet of the turbine is given to be 18 m/s. The blade velocity is given as 25 m/s. What is the hydraulic efficiency for a head of 50 m. Take g = 10 m/s2? |
| A. | 80% |
| B. | 90% |
| C. | 70% |
| D. | 98% |
| Answer» B. 90% | |
| 771. |
Which of the following efficiencies for Kaplan Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» A. Hydraulic efficiency | |
| 772. |
The desired hydraulic efficiency of a Kaplan turbine is 98% at a whirl velocity of 20 m/s and a head of 60 m. What should be the blade velocity of the turbine at inlet in m/s? Take g = 10 m/s2. |
| A. | 40 |
| B. | 60 |
| C. | 80 |
| D. | 30 |
| Answer» D. 30 | |
| 773. |
It is given that the input water power of the Kaplan turbine is 1.10 times the runner power. What would be the hydraulic efficiency of the turbine (in %)? |
| A. | 60.61 |
| B. | 70.71 |
| C. | 80.81 |
| D. | 90.91 |
| Answer» D. 90.91 | |
| 774. |
Which of the following efficiencies for Kaplan Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 775. |
The volume flow rate into a Kaplan turbine is Q m3/s. 0.10Q m3/s volume of water do not flow over the runner blades. What further information is required to find the volumetric efficiency (numerical value) of the Kaplan turbine? |
| A. | The numerical value of Q |
| B. | The available head of the turbine |
| C. | The RPM or the blade velocity of the turbine |
| D. | No further information is required |
| Answer» D. No further information is required | |
| 776. |
A student reports the volumetric efficiency of a Kaplan turbine to be 95%. If he measures the volume flow rate through the turbine is 40 m3/s. What is the flow rate of water over the runner blades (in m3/s)? |
| A. | 38 |
| B. | 40 |
| C. | 42.11 |
| D. | 45 |
| Answer» A. 38 | |
| 777. |
95*40 = 38 m3/s. 358. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
| A. | 4.05 |
| B. | 3.15 |
| C. | 3.30 |
| D. | 2.55 |
| Answer» B. 3.15 | |
| 778. |
Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» C. Mechanical efficiency | |
| 779. |
The power available at the shaft of a Kaplan turbine is 0.75 MW. The volume flow rate of water in 15 m3/s, whirl velocity at inlet is 12 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)? |
| A. | 66.66 |
| B. | 75.00 |
| C. | 83.33 |
| D. | 91.33 |
| Answer» C. 83.33 | |
| 780. |
The whirl velocity at inlet of a Kaplan turbine is 7.5 m/s and blade velocity is 5 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 93% (in MW)? |
| A. | 0.831 |
| B. | 0.697 |
| C. | 1.362 |
| D. | 0.298 |
| Answer» B. 0.697 | |
| 781. |
In a Kaplan Turbine experimental setup, the power output of the shaft is 4.325 MW. The volume flow rate of water in 15 m3/s at an available head of 50 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
| A. | 57.66 |
| B. | 83.63 |
| C. | 81.33 |
| D. | 79.95 |
| Answer» A. 57.66 | |
| 782. |
The hydraulic efficiency of a Kaplan turbine is 95%, the mechanical efficiency is 93% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)? |
| A. | 80.05 |
| B. | 93.15 |
| C. | 87.55 |
| D. | 88.35 |
| Answer» D. 88.35 | |
| 783. |
Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 784. |
In Kaplan turbine apparatus, the volume flow rate of water in 15 m3/s at an available head of 55 m (g = 10 m/s2). Find the shaft power (in MW) if the overall efficiency of the turbine is 95%. |
| A. | 78.3 |
| B. | 7.83 |
| C. | 783 |
| D. | 0.783 |
| Answer» B. 7.83 | |
| 785. |
Draft tube is also called |
| A. | Straight divergent tube |
| B. | Simple elbow tube |
| C. | Thermal tube |
| D. | Elbow tube with varying cross section |
| Answer» A. Straight divergent tube | |
| 786. |
A draft tube helps in converting kinetic energy into |
| A. | Electrical work |
| B. | Mechanical work |
| C. | Chemical work |
| D. | Thermal work |
| Answer» B. Mechanical work | |
| 787. |
Most common application of the draft tube is |
| A. | Rotor |
| B. | Motor |
| C. | Pump |
| D. | Filter |
| Answer» C. Pump | |
| 788. |
Draft tube consists of conical diffuser with angles of |
| A. | 10 deg |
| B. | 20 deg |
| C. | 30 deg |
| D. | 40 deg |
| Answer» A. 10 deg | |
| 789. |
What is the purpose of a Draft tube? |
| A. | To prevent flow separation |
| B. | To avoid Pressure drag |
| C. | To prevent rejection of heat |
| D. | To increase efficiency |
| Answer» A. To prevent flow separation | |
| 790. |
What is the maximum value of efficiency in a draft tube? |
| A. | 100 |
| B. | 50 |
| C. | 90 |
| D. | 40 |
| Answer» C. 90 | |
| 791. |
Turbine that consists of draft tubes is called as_ |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» D. Reaction turbine | |
| 792. |
Which of the following is a 50 percent reaction turbine? |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» A. Parsons turbine | |
| 793. |
The simple elbow draft tube helps to cut down the cost of excavation. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 794. |
The exit diameter for a simple elbow draft tube should be |
| A. | Large |
| B. | Small |
| C. | Very small |
| D. | Same |
| Answer» A. Large | |
| 795. |
Properties that do not affect a draft tube is |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» B. Temperature | |
| 796. |
The other name for elbow with varying cross section tube is called |
| A. | Pressure tube |
| B. | Bent draft tube |
| C. | Velocity tube |
| D. | Sink tube |
| Answer» B. Bent draft tube | |
| 797. |
What is the efficiency of the simple elbow type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» C. 60 | |
| 798. |
The horizontal portion of the draft tube is usually bent to prevent entry of air from the exit end. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 799. |
The efficiency of the draft tube is ratio of |
| A. | Pressure energy by kinetic energy |
| B. | Kinetic energy by Pressure energy |
| C. | Kinetic energy into mechanical energy |
| D. | Pressure into mechanical |
| Answer» B. Kinetic energy by Pressure energy | |
| 800. |
Draft tubes are not used in which of the following turbines? |
| A. | Francis |
| B. | Reaction |
| C. | Kaplan |
| D. | Pelton |
| Answer» D. Pelton | |
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