McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 601. |
The depth of buckets of Pelton wheel |
| A. | 1.2 times diameter of jet |
| B. | 1.3 times diameter of jet |
| C. | 1.4 times diameter of jet |
| D. | 1.5 times diameter of jet |
| Answer» A. 1.2 times diameter of jet | |
| 602. |
The ratio of pitch diameter of Pelton wheel to diameter of jet is known as |
| A. | Speed ratio |
| B. | Jet ratio |
| C. | Velocity ratio |
| D. | Co-efficient of velocity |
| Answer» B. Jet ratio | |
| 603. |
Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm. |
| A. | 1.25 meters |
| B. | 1.5 meters |
| C. | 2 meters |
| D. | 1.2 meters |
| Answer» A. 1.25 meters | |
| 604. |
The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is |
| A. | 80mm |
| B. | 85mm |
| C. | 90mm |
| D. | 82mm |
| Answer» B. 85mm | |
| 605. |
In most of cases the value of jet ratio is |
| A. | 10 |
| B. | 11 |
| C. | 12 |
| D. | 13 |
| Answer» C. 12 | |
| 606. |
Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet) |
| A. | 15 + D/2d |
| B. | 15 + 3D/2d |
| C. | 15 + D/d |
| D. | 15 + 2D/d |
| Answer» A. 15 + D/2d | |
| 607. |
is obtained by dividing total rate of flow through the turbine by rate of flow through single jet. |
| A. | Number of jets |
| B. | Diameter of jets |
| C. | Velocity of jets |
| D. | Speed ratio |
| Answer» A. Number of jets | |
| 608. |
If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets. |
| A. | 400mm |
| B. | 500mm |
| C. | 420mm |
| D. | 425mm |
| Answer» D. 425mm | |
| 609. |
If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is |
| A. | 100mm |
| B. | 105mm |
| C. | 106mm |
| D. | 102mm |
| Answer» D. 102mm | |
| 610. |
If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately |
| A. | 20 |
| B. | 22 |
| C. | 23 |
| D. | 25 |
| Answer» D. 25 | |
| 611. |
Radial flow reaction turbines are those turbines in which water flows |
| A. | Radial direction |
| B. | Axial direction |
| C. | Tangential direction |
| D. | All of the mentioned |
| Answer» A. Radial direction | |
| 612. |
Main parts of radial flow reaction turbines are |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 613. |
Radial flow reaction turbines contain spiral casing which area |
| A. | Remains constant |
| B. | Gradually decreases |
| C. | Gradually increases |
| D. | Suddenly decreases |
| Answer» B. Gradually decreases | |
| 614. |
consists of stationary circular wheel all around the runner of turbine |
| A. | Casing |
| B. | Guide mechanism |
| C. | Runner |
| D. | Drafting |
| Answer» B. Guide mechanism | |
| 615. |
The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner |
| A. | Variable acceleration |
| B. | Constant acceleration |
| C. | Variable velocity |
| D. | Constant velocity |
| Answer» D. Constant velocity | |
| 616. |
allow the water to strike the vanes fixed on runner without shock at inlet |
| A. | Casing |
| B. | Guide vanes |
| C. | Runner |
| D. | Draft tube |
| Answer» B. Guide vanes | |
| 617. |
Runner blades are made up of |
| A. | Cast steel |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» A. Cast steel | |
| 618. |
The pressure at the exit of runner of reaction turbine is generally than atmospheric pressure |
| A. | Greater |
| B. | Lesser |
| C. | Constant |
| D. | Equal |
| Answer» B. Lesser | |
| 619. |
is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | Runner |
| Answer» C. Draft tube | |
| 620. |
and of radial flow reaction turbine are always full of water. |
| A. | Casing and runner |
| B. | Casing and penstocks |
| C. | Runner and penstocks |
| D. | Runner and draft tube |
| Answer» A. Casing and runner | |
| 621. |
governs the flow of water entering the runner blades. |
| A. | Casing |
| B. | Guide vanes |
| C. | Draft tube |
| D. | Runner |
| Answer» B. Guide vanes | |
| 622. |
Inward radial flow reaction turbine is a turbine in which water flows across the blades of runner_ |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 623. |
Which of following is inward radial flow reaction turbine? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Axial turbine |
| D. | Kaplan turbine |
| Answer» B. Francis turbine | |
| 624. |
In Inward radial flow reaction turbine which is not required? |
| A. | Runner |
| B. | Air tight casing |
| C. | Guide vanes |
| D. | Breaking jet |
| Answer» D. Breaking jet | |
| 625. |
The main difference between reaction turbine and inward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 626. |
In Inward 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 | |
| 627. |
In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» A. Speed ratio | |
| 628. |
In Inward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at outlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» B. Radial outlet discharge | |
| 629. |
In which of following turbine whirl component is zero? |
| A. | Reaction turbine |
| B. | Inward radial flow reaction turbine |
| C. | Axial flow turbine |
| D. | Impulse turbine |
| Answer» B. Inward radial flow reaction turbine | |
| 630. |
Discharge in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 631. |
Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» B. Moderate | |
| 632. |
Centrifugal head in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 633. |
Tendency of wheel to race is almost nil in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» A. Inward flow reaction turbine | |
| 634. |
The formation of vapour cavities is called |
| A. | Static pressure drop |
| B. | Cavitation |
| C. | Isentropic expansion |
| D. | Emulsion |
| Answer» B. Cavitation | |
| 635. |
What is the degree of reaction denoted as? |
| A. | D |
| B. | R |
| C. | r |
| D. | d |
| Answer» B. R | |
| 636. |
Voids are created due to |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Liquid free layers |
| D. | Volumetric layers |
| Answer» C. Liquid free layers | |
| 637. |
Cavitation usually occurs due to the changes in |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Heat |
| Answer» A. Pressure | |
| 638. |
Degree of reactions are most commonly used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 639. |
At high pressure, the voids can generate |
| A. | Drag force |
| B. | Mass density |
| C. | Shock waves |
| D. | Flow speed |
| Answer» C. Shock waves | |
| 640. |
Voids that implode near metal surface develops a |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed |
| Answer» B. Cyclic stress | |
| 641. |
In case of gas turbines and compressors, degree of reaction is |
| A. | Static pressure drop in rotor/ static pressure drop in stage |
| B. | Static pressure drop in stage/ static pressure drop in rotor |
| C. | Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage |
| D. | Static temperature drop in stage/ static temperature drop in rotor |
| Answer» C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage | |
| 642. |
The velocities of the blade angles can be found out using |
| A. | Mach number |
| B. | Froude’s number |
| C. | Velocity triangles |
| D. | Reynolds number |
| Answer» C. Velocity triangles | |
| 643. |
Which among the following velocities cannot be found using the velocity triangle? |
| A. | Tangential |
| B. | Whirl |
| C. | Relative |
| D. | Parabolic |
| Answer» D. Parabolic | |
| 644. |
Hydrodynamic cavitation is due to the process of |
| A. | Vaporisation |
| B. | Sedimentation |
| C. | Filtration |
| D. | Excavation |
| Answer» A. Vaporisation | |
| 645. |
The process of bubble generation leads to |
| A. | High temperatures |
| B. | High pressures |
| C. | High energy densities |
| D. | High volumetric ratio |
| Answer» C. High energy densities | |
| 646. |
Degree of reaction turbine is the ratio of? |
| A. | Pressure energy to total energy |
| B. | Kinetic energy to total energy |
| C. | Potential energy to total energy |
| D. | Kinetic energy to potential energy |
| Answer» A. Pressure energy to total energy | |
| 647. |
Which of these options are best suited for the total energy change inside the runner per unit weight? |
| A. | Degree of action |
| B. | Degree of reaction |
| C. | Turbulence |
| D. | Efficiency of turbine |
| Answer» B. Degree of reaction | |
| 648. |
Which of these ratios are termed to be hydraulic efficiency? |
| A. | Water power to delivered power |
| B. | Delivered power to input power |
| C. | Power lost to power delivered |
| D. | Runner power to water power |
| Answer» D. Runner power to water power | |
| 649. |
When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed? |
| A. | Kinetic energy |
| B. | Pressure energy |
| C. | Potential energy |
| D. | Energy due to viscous force |
| Answer» B. Pressure energy | |
| 650. |
For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum? |
| A. | 90 |
| B. | 45 |
| C. | 60 |
| D. | 30 |
| Answer» A. 90 | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.