MCQOPTIONS
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MCQOPTIONS
This section includes 2158 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Most common application of the draft tube is |
| A. | Rotor |
| B. | Motor |
| C. | Pump |
| D. | Filter |
| Answer» D. Filter | |
| 452. |
Centrifugal pump impellers have speed ranging from |
| A. | 500- 10000 |
| B. | 50- 100 |
| C. | 200-300 |
| D. | 0-50 |
| Answer» B. 50- 100 | |
| 453. |
The flow in which the particles of a fluid attain such velocities that varies from point to point inmagnitude and direction as well as from instant to instant, is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» E. | |
| 454. |
Specific speed of a Kaplan turbine is |
| A. | 8.5 to 30 |
| B. | 30 to 51 |
| C. | 51 to 225 |
| D. | 355 to 860 |
| Answer» E. | |
| 455. |
Constant speed curves travel at constant speed when the value is equal to |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 456. |
Cavitation in a draft tube occurs when |
| A. | Temperature difference |
| B. | Pressure drop |
| C. | Kinetic energy difference |
| D. | Density of flow |
| Answer» C. Kinetic energy difference | |
| 457. |
governs the flow of water entering the runner blades. |
| A. | Casing |
| B. | Guide vanes |
| C. | Draft tube |
| D. | Runner |
| Answer» C. Draft tube | |
| 458. |
The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of waterflowing through the turbine per second (m3/s)? |
| A. | 90 |
| B. | 111 |
| C. | 125 |
| D. | 168 |
| Answer» C. 125 | |
| 459. |
The draft tube is situated in the |
| A. | Inlet |
| B. | Outlet |
| C. | Tank |
| D. | Nozzle |
| Answer» C. Tank | |
| 460. |
Imperial units is defined as |
| A. | Temperature by pressure |
| B. | Tail race and head race |
| C. | Revolutions per minute |
| D. | Turbine performance |
| Answer» D. Turbine performance | |
| 461. |
Gauge pressure of the draft tube is denoted by |
| A. | P |
| B. | h |
| C. | z |
| D. | x |
| Answer» B. h | |
| 462. |
Principle of fluid mechanics works on the utilization of |
| A. | Accelerating mass |
| B. | Volume |
| C. | Work |
| D. | Velocity |
| Answer» D. Velocity | |
| 463. |
Which among the following is not a unit quantity of turbine? |
| A. | Unit speed |
| B. | Unit discharge |
| C. | Unit power |
| D. | Unit temperature |
| Answer» E. | |
| 464. |
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s,then depth of parabola which the liquid assumes is |
| A. | ω.r/2g |
| B. | ω².r²/2g |
| C. | ω.r/4g |
| D. | ω².r²/4g |
| Answer» C. ω.r/4g | |
| 465. |
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» C. Radially outward | |
| 466. |
Rotary pumps do not function well under |
| A. | High Vaporisation |
| B. | High Sedimentation |
| C. | High viscosity |
| D. | Excavation View Answer |
| Answer» D. Excavation View Answer | |
| 467. |
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» D. [Vw1+Vw2]u/g | |
| 468. |
Gear pumps are used to transport |
| A. | Pressure |
| B. | Speed |
| C. | Power |
| D. | Fluid View Answer |
| Answer» E. | |
| 469. |
For laminar flow in a pipe of circular cross-section, the Darcy’s frictionfactor f is |
| A. | directly proportional to Reynolds number and independent of pipe wall roughness |
| B. | directly proportional to pipe wall roughness and independent of Reynolds number |
| C. | inversely proportional to Reynolds number and indpendent of pipe wall roughness |
| D. | inversely proportional to Reynolds number and directly proportional to pipe wall roughness |
| Answer» D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness | |
| 470. |
The draft tube at the exit of the nozzle increases the |
| A. | Temperature |
| B. | Pressure |
| C. | Volume of the flow |
| D. | Density of flow |
| Answer» C. Volume of the flow | |
| 471. |
Which of the following is a 50 percent reaction turbine? |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» B. Curtis turbine | |
| 472. |
Specific speed is an index used to predict |
| A. | Head race distance |
| B. | Tail race distance |
| C. | Tank dimensions |
| D. | Turbine performance |
| Answer» E. | |
| 473. |
The pump that uses a relatively smaller amount of liquid is called |
| A. | Froth pump |
| B. | Reciprocating pump |
| C. | Double acting |
| D. | Bicycle pump View Answer |
| Answer» C. Double acting | |
| 474. |
Constant efficiency curves are plotted using |
| A. | Constant head curves |
| B. | Constant speed curves |
| C. | Main characteristic curves |
| D. | Constant speed and constant head |
| Answer» E. | |
| 475. |
Air vessel accumulates excess quantity of |
| A. | Vapor |
| B. | Water |
| C. | Heat |
| D. | Pressure View Answer |
| Answer» C. Heat | |
| 476. |
The correct relationship among displacement thickness d, momentumthickness m and energy thickness e is |
| A. | d > m > e |
| B. | d > e > m |
| C. | e > m > d |
| D. | e > d > m |
| Answer» E. | |
| 477. |
The runner diameter in a turbine is denoted as |
| A. | A |
| B. | Dr |
| C. | Rr |
| D. | De |
| Answer» E. | |
| 478. |
Unit quantities are physical quantities |
| A. | With numerical variables |
| B. | Without numerical variables |
| C. | With different sets |
| D. | With unit difference |
| Answer» C. With different sets | |
| 479. |
The head added by the pump is a sum of |
| A. | Pressure |
| B. | Static lift |
| C. | Volume |
| D. | Flow rate View Answer |
| Answer» C. Volume | |
| 480. |
The distance y from pipe boundary, at which the point velocity is equal toaverage velocity for turbulent flow, is (where R is radius of pipe.) |
| A. | 0.223 R |
| B. | 0.423 R |
| C. | 0.577 R |
| D. | 0.707 R |
| Answer» B. 0.423 R | |
| 481. |
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» E. | |
| 482. |
Constant speed is measured |
| A. | Mechanically |
| B. | Electrically |
| C. | Chemically |
| D. | Thermally |
| Answer» B. Electrically | |
| 483. |
Unit speed of a single jet in a turbine is |
| A. | 100 m/s |
| B. | 300 m/s |
| C. | 500 m/s |
| D. | 800 m/s |
| Answer» E. | |
| 484. |
If we raise the liquid level in the suction vessel, cavitation |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent View Answer |
| Answer» C. Same | |
| 485. |
How many impellers does a multistage centrifugal pump have? |
| A. | Zero |
| B. | One |
| C. | Exactly two |
| D. | Two and more View Answer |
| Answer» E. | |
| 486. |
In order that flow takes place between two points in a pipeline, the differential pressurebetween these points must be more than |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» E. | |
| 487. |
The diameter of the nozzle (d) for maximum transmission of power is given by (where D =Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe) |
| A. | d = (D⁵/8fl)1/2 |
| B. | d = (D⁵/8fl)1/3 |
| C. | d = (D⁵/8fl)1/4 |
| D. | d = (D⁵/8fl)1/5 |
| Answer» D. d = (D⁵/8fl)1/5 | |
| 488. |
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 'θ'.Sensitivity of inclined tube to sensitivity of U-tube is equal to |
| A. | Sinθ |
| B. | 1/Sinθ |
| C. | Cos θ |
| D. | 1/Cosθ |
| Answer» C. Cos θ | |
| 489. |
The horse power transmitted through a pipe is maximum when the ratioof loss of head due to friction and total head supplied is |
| A. | 1/3 |
| B. | 1/4 |
| C. | 1/2 |
| D. | 2/3 |
| Answer» B. 1/4 | |
| 490. |
Force exerted by a jet on a stationery plate happens in how many cases? |
| A. | 3 cases |
| B. | 2 cases |
| C. | 1 case |
| D. | Nil |
| Answer» B. 2 cases | |
| 491. |
Draft tube is also called |
| A. | Straight divergent tube |
| B. | Simple elbow tube |
| C. | Thermal tube |
| D. | Elbow tube with varying cross section |
| Answer» B. Simple elbow tube | |
| 492. |
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar.) |
| A. | 0.40 cm |
| B. | 0.20 cm |
| C. | 0.10 cm |
| D. | 0.05 cm |
| Answer» C. 0.10 cm | |
| 493. |
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» C. Kinetic energy into mechanical energy | |
| 494. |
The height of a column in a pump is called as |
| A. | Vertical head |
| B. | Horizontal head |
| C. | Static head |
| D. | Multi head View Answer |
| Answer» D. Multi head View Answer | |
| 495. |
When the piston moves forward, liquid is drawn |
| A. | Into the cylinder |
| B. | Away from the cylinder |
| C. | Into the draft tube |
| D. | Away from the draft tube View Answer |
| Answer» B. Away from the cylinder | |
| 496. |
Turbomachines work under |
| A. | Newtons first law |
| B. | Newtons second law |
| C. | Newtons third law |
| D. | Kepler’s law View Answer |
| Answer» C. Newtons third law | |
| 497. |
2.Total head of turbines is_ |
| A. | Pressure head + Static head |
| B. | Kinetic head + Static head |
| C. | Static head + Pressure head |
| D. | Pressure head + Kinetic head + Static head |
| Answer» E. | |
| 498. |
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» C. Axial flow turbine | |
| 499. |
Internal breakage in a pump mainly takes place when |
| A. | Discharge pressure is increased |
| B. | Temperature is increased |
| C. | Heat leads to expansion |
| D. | Corrosion takes place View Answer |
| Answer» B. Temperature is increased | |
| 500. |
What is the common application of multistage centrifugal pump? |
| A. | Mineral industries |
| B. | Boiler feed water pump |
| C. | Removes ores |
| D. | Detects oil View Answer |
| Answer» C. Removes ores | |