McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 651. |
Discharge through a reaction flow reaction turbine is given by, Q = |
| A. | Pi*d*b*Vf1 |
| B. | Pi*d*d*b*Vf1 |
| C. | Pi*d*b*b*Vf2 |
| D. | Pi*b*b*Vf1 |
| Answer» A. Pi*d*b*Vf1 | |
| 652. |
When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration? |
| A. | Pi*d – n*t |
| B. | Pi*d – n*n*t |
| C. | Pi*d – t*t |
| D. | Pi*d *d– n*t |
| Answer» A. Pi*d – n*t | |
| 653. |
means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero. |
| A. | Axial discharge |
| B. | Tangential discharge |
| C. | Turbulent discharge |
| D. | Radial discharge |
| Answer» D. Radial discharge | |
| 654. |
In a Francis turbine, degree of reaction lies between |
| A. | 0 and 1 |
| B. | 1 and 2 |
| C. | 0 and 0.5 |
| D. | 0.5 and 0.1 |
| Answer» A. 0 and 1 | |
| 655. |
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» C. casing | |
| 656. |
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» D. Outward flow turbine | |
| 657. |
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» C. kinetic energy and pressure energy | |
| 658. |
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» B. Runner | |
| 659. |
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» B. Flow ratio | |
| 660. |
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» A. Speed ratio | |
| 661. |
Discharge in an outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 662. |
An outward radial reaction turbine has |
| A. | u1 < u2 |
| B. | u1 > u2 |
| C. | u1 = u2 |
| D. | u2 = u1 = 0 |
| Answer» A. u1 < u2 | |
| 663. |
An outward flow reaction turbine, |
| A. | D1 > D2 |
| B. | D1 < D2 |
| C. | D1 = D2 |
| D. | D1 = D2 = 0 |
| Answer» B. D1 < D2 | |
| 664. |
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» A. Degree of reaction | |
| 665. |
Degree of reaction for impulse turbine |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» A. 0 | |
| 666. |
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» A. 1- cot x /2(cot x –cot y ) | |
| 667. |
A turbine is a |
| A. | Rotary mechanical device |
| B. | Static pressure drop device |
| C. | Electrical device |
| D. | Static temperature device |
| Answer» A. Rotary mechanical device | |
| 668. |
Turbine converts |
| A. | Work to energy |
| B. | Energy to work |
| C. | Work to Electricity |
| D. | Work to pressure |
| Answer» B. Energy to work | |
| 669. |
Turbine extracts energy from |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Fluid flow |
| D. | Volumetric ratio |
| Answer» C. Fluid flow | |
| 670. |
Inward flow reaction turbine enter through |
| A. | Outer periphery |
| B. | Blades |
| C. | Inner periphery |
| D. | Pressure angle |
| Answer» A. Outer periphery | |
| 671. |
A turbine is a |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 672. |
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» C. Efficiency is 100 percent | |
| 673. |
Where is the turbine not used? |
| A. | Solar power |
| B. | Windmill |
| C. | Water wheels |
| D. | Gas plant |
| Answer» A. Solar power | |
| 674. |
In an inward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» B. Decreases | |
| 675. |
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» A. Pressure change | |
| 676. |
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» A. Pressure change | |
| 677. |
In an outward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» A. Increases | |
| 678. |
Before reaching the turbine, the acceleration of the fluid takes place through the |
| A. | Vane angle |
| B. | Nozzle |
| C. | Pump |
| D. | Pipe |
| Answer» B. Nozzle | |
| 679. |
The Pelton wheel extracts energy from |
| A. | Vane angle |
| B. | Moving fluid |
| C. | Increase in temperature |
| D. | Heat rejection |
| Answer» B. Moving fluid | |
| 680. |
The outward radial flow reaction turbine is a turbine in which direction of water flow is |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» C. Radially outward | |
| 681. |
The energy available at inlet for outward reaction flow turbine is |
| A. | Potential |
| B. | Kinetic energy |
| C. | Pressure energy |
| D. | Pressure energy and Kinetic energy |
| Answer» D. Pressure energy and Kinetic energy | |
| 682. |
Centrifugal head in Outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 683. |
Discharge in outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 684. |
Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» D. Very difficult | |
| 685. |
Tendency of wheel to race is predominant in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» B. Outward flow reaction turbine | |
| 686. |
Outward flow reaction turbine will quite suitable for_ |
| A. | High head |
| B. | Medium head |
| C. | Low head |
| D. | Static head |
| Answer» B. Medium head | |
| 687. |
In outward flow reaction turbine tangential velocity at inlet is always_ than outlet velocity. |
| A. | Equal |
| B. | Less |
| C. | More |
| D. | Constant |
| Answer» B. Less | |
| 688. |
In outward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at inlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» A. Radial inlet discharge | |
| 689. |
The main difference between reaction turbine and outward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 690. |
In 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» B. Flow ratio | |
| 691. |
Conical diffuser 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 | |
| 692. |
The simple elbow draft tube is placed close to the_ |
| A. | Head race |
| B. | Tail race |
| C. | Tank |
| D. | Nozzle |
| Answer» B. Tail race | |
| 693. |
Turbine that consists of moving nozzles and with fixed nozzles is called as |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» D. Reaction turbine | |
| 694. |
An example of reaction turbine is_ |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» A. Parsons turbine | |
| 695. |
When we arrange turbine blades in multiple stages it is called |
| A. | Pressure change |
| B. | Vane deviation |
| C. | Compounding |
| D. | Pressure ratio |
| Answer» C. Compounding | |
| 696. |
Compounding is needed to |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» D. Increase efficiency | |
| 697. |
Which among the following is not a type of compounding? |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» B. Temperature | |
| 698. |
Newtons second law describes the transfer of energy through impulse turbines. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 699. |
Inner radial flow extracts energy from |
| A. | Turbine blades |
| B. | Moving fluid |
| C. | Pressure change |
| D. | Temperature increase |
| Answer» B. Moving fluid | |
| 700. |
Reaction turbines develop torque by reacting to the gas or fluids pressure or mass. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
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