McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 551. |
Among the following which turbine has highest efficiency? |
| A. | Kaplan turbine |
| B. | Francis turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» A. Kaplan turbine | |
| 552. |
In the expression for overall efficiency of turbine, which is p/(k*g*q*h), where “k” is known as |
| A. | Density of liquid |
| B. | Specific density of liquid |
| C. | Volume of liquid |
| D. | Specific gravity of liquid |
| Answer» A. Density of liquid | |
| 553. |
The expression for maximum hydraulic efficiency of pelton 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» A. (1+cos k)/2 where k is outlet blade angle | |
| 554. |
To obtain maximum hydraulic efficiency of pelton turbine, blade velocity should be Times the inlet velocity of jet. |
| A. | Half |
| B. | One quarter |
| C. | Twice |
| D. | Thrice |
| Answer» A. Half | |
| 555. |
Among the following which turbine has least efficiency? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» A. Pelton turbine | |
| 556. |
A hydraulic coupling belongs to the category of |
| A. | Energy absorbing machines |
| B. | Energy generating machines |
| C. | Power absorbing machines |
| D. | Energy transfer machines |
| Answer» D. Energy transfer machines | |
| 557. |
The electric power which is obtained from hydraulic energy |
| A. | Thermal power |
| B. | Mechanical power |
| C. | Solar power |
| D. | Hydroelectric power |
| Answer» D. Hydroelectric power | |
| 558. |
At present which is cheapest means of generating power_ |
| A. | Thermal power |
| B. | Nuclear power |
| C. | Hydroelectric power |
| D. | Electric Power |
| Answer» C. Hydroelectric power | |
| 559. |
Pipes of largest diameter which carry water from reservoir to the turbines is known as_ |
| A. | Head stock |
| B. | Tail race |
| C. | Tail stock |
| D. | Pen stock |
| Answer» D. Pen stock | |
| 560. |
Pen stocks are made up of |
| A. | Steel |
| B. | Cast iron |
| C. | Mild steel |
| D. | Wrought iron |
| Answer» A. Steel | |
| 561. |
is an inward radial flow reaction turbine? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» C. Francis turbine | |
| 562. |
The important type of axial flow reaction turbines are |
| A. | Propeller and Pelton turbines |
| B. | Kaplan and Francis turbines |
| C. | Propeller and Francis turbines |
| D. | Propeller and Kaplan turbines |
| Answer» D. Propeller and Kaplan turbines | |
| 563. |
is a axial flow reaction turbines, if vanes are fixed to hub of turbine |
| A. | Propeller turbine |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | Pelton turbine |
| Answer» A. Propeller turbine | |
| 564. |
Francis and Kaplan turbines are known as |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Axial flow turbine |
| D. | Mixed flow turbine |
| Answer» B. Reaction turbine | |
| 565. |
Specific speed of reaction turbine is between? |
| A. | 5 and 50 |
| B. | 10 and 100 |
| C. | 100 and 150 |
| D. | 150 and 300 |
| Answer» B. 10 and 100 | |
| 566. |
Impulse turbine is generally fitted at |
| A. | At the level of tail race |
| B. | Above the tail race |
| C. | Below the tail race |
| D. | About 2.5mts above tail race to avoid cavitations. |
| Answer» B. Above the tail race | |
| 567. |
Hydraulic turbines are classified based on |
| A. | Energy available at inlet of turbine |
| B. | Direction of flow through vanes |
| C. | Head at inlet of turbine |
| D. | Energy available, Direction of flow, Head at inlet. |
| Answer» D. Energy available, Direction of flow, Head at inlet. | |
| 568. |
Impulse turbine and reaction turbine are classified based on ? |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» A. Type of energy at inlet | |
| 569. |
Tangential flow, axial flow, radial flow turbines are classified based on? |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» B. Direction of flow through runner | |
| 570. |
High head, low head and medium head turbines are classified based on |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» C. Head at inlet of turbine | |
| 571. |
Low specific speed, high specific speed and medium specific speed are classified based on |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» D. Specific speed of turbine | |
| 572. |
If energy available at inlet of turbine is only kinetic energy then it is classified based on |
| A. | Type of energy at inlet |
| B. | Direction of flow through runner |
| C. | Head at inlet of turbine |
| D. | Specific speed of turbine |
| Answer» A. Type of energy at inlet | |
| 573. |
If water flows in radial direction at inlet of runner and leaves axially at outlet then turbine is named as |
| A. | Tangential flow turbine |
| B. | Axial flow turbine |
| C. | Radial flow turbine |
| D. | Mixed flow turbine |
| Answer» D. Mixed flow turbine | |
| 574. |
Pelton turbine is operated under |
| A. | Low head and high discharge |
| B. | High head and low discharge |
| C. | Medium head and high discharge |
| D. | Medium head and medium discharge |
| Answer» B. High head and low discharge | |
| 575. |
Kaplan turbine is operated under |
| A. | Low head and high discharge |
| B. | High head and low discharge |
| C. | Medium head and high discharge |
| D. | Medium head and medium discharge |
| Answer» A. Low head and high discharge | |
| 576. |
Medium specific speed of turbine implies |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» C. Francis turbine | |
| 577. |
High specific speed of turbine implies that it is_ |
| A. | Francis turbine |
| B. | Propeller turbine |
| C. | Pelton turbine |
| D. | Kaplan turbine |
| Answer» D. Kaplan turbine | |
| 578. |
Velocity triangles are used to analyze |
| A. | Flow of water along blades of turbine |
| B. | Measure discharge of flow |
| C. | Angle of deflection of jet |
| D. | Flow of water, measure of discharge, angle of deflection. |
| Answer» D. Flow of water, measure of discharge, angle of deflection. | |
| 579. |
In which of following turbine inlet and outlet blade velocities of vanes are equal? |
| A. | Francis turbine |
| B. | Kaplan turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» C. Pelton turbine | |
| 580. |
Tangential velocity of blade of Pelton wheel is proportional to |
| A. | Speed of wheel |
| B. | Angular velocity of wheel |
| C. | Rpm of wheel |
| D. | Speed, angular velocity, RPM of the wheel |
| Answer» A. Speed of wheel | |
| 581. |
In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude? |
| A. | Pelton turbine |
| B. | Propeller turbine |
| C. | Kaplan turbine |
| D. | Francis turbine |
| Answer» A. Pelton turbine | |
| 582. |
In Pelton wheel, if outlet velocity angle of jet is “acute angled” then outlet whirl velocity of jet is |
| A. | x- component of V(r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» A. x- component of V(r2) – blade velocity | |
| 583. |
In Pelton wheel, if outlet velocity angle of jet is “obtuseangled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» C. Blade velocity – x- component of V (r2) | |
| 584. |
In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» D. Zero | |
| 585. |
In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is |
| A. | Difference between inlet jet velocity and blade velocity |
| B. | Sum of inlet jet velocity and blade velocity |
| C. | Inlet jet velocity |
| D. | Blade velocity |
| Answer» A. Difference between inlet jet velocity and blade velocity | |
| 586. |
In Pelton wheel if angle of deflection is not mentioned then we assume it as_ |
| A. | 150 degrees |
| B. | 200 degrees |
| C. | 165 degrees |
| D. | 185 degrees |
| Answer» C. 165 degrees | |
| 587. |
The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression |
| A. | [Vw1+Vw2] u/g |
| B. | Vw1*u/g |
| C. | [Vw1+Vw2]/g |
| D. | [Vw1+Vw2]u |
| Answer» A. [Vw1+Vw2] u/g | |
| 588. |
In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as |
| A. | Shaft power |
| B. | Runner power |
| C. | Output power |
| D. | Water power |
| Answer» B. Runner power | |
| 589. |
In Pelton turbines the expression for power delivered at inlet to runner is given by |
| A. | W*[Vw1+Vw2]u/g |
| B. | W*[Vw1-Vw2]u/g |
| C. | W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g |
| D. | [Vw1+Vw2]u/g |
| Answer» C. W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g | |
| 590. |
Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94? |
| A. | 200Kw |
| B. | 150Kw |
| C. | 187Kw |
| D. | 250Kw |
| Answer» C. 187Kw | |
| 591. |
10.The expression for water power in Pelton wheel is |
| A. | (P*g*Q*H) Kw |
| B. | (g*Q*H*a) Kw |
| C. | (g*Q) Kw |
| D. | (g*H) Kw |
| Answer» A. (P*g*Q*H) Kw | |
| 592. |
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» A. V/2 | |
| 593. |
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» C. Hydraulic efficiency | |
| 594. |
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» D. Overall efficiency | |
| 595. |
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» B. Volumetric efficiency | |
| 596. |
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» D. Overall efficiency | |
| 597. |
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» A. (1+cos k)/2 where k is outlet blade angle | |
| 598. |
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» B. Density of liquid | |
| 599. |
Design of Pelton wheel means the following data is to be determined. |
| A. | Width of buckets |
| B. | Depth of buckets |
| C. | Number of buckets |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 600. |
The width of buckets of Pelton wheel is |
| A. | 2 times diameter of jet |
| B. | 3 times diameter of jet |
| C. | 4 times diameter of jet |
| D. | 5 times diameter of jet |
| Answer» D. 5 times diameter of jet | |
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