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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.
| 651. |
The parameter that disturbs the working of the rotary pump is_ |
| A. | High Vaporisation |
| B. | High Sedimentation |
| C. | Low flow rate |
| D. | Excavation View Answer |
| Answer» D. Excavation View Answer | |
| 652. |
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» E. | |
| 653. |
Main parts of radial flow reaction turbines are |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | All of the mentioned |
| Answer» E. | |
| 654. |
The pressure at the exit of runner of reaction turbine is generally than atmospheric pressure |
| A. | Greater |
| B. | Lesser |
| C. | Constant |
| D. | Equal |
| Answer» C. Constant | |
| 655. |
An open tank contains 1 m deep water with 50 cm depth of oil of specificgravity 0.8 above it. The intensity of pressure at the bottom of tank will be |
| A. | 4 kN/m2 |
| B. | 10 kN/m2 |
| C. | 12 kN/m2 |
| D. | 14 kN/m2 |
| Answer» E. | |
| 656. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenlycontracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is |
| A. | v₁²/2g |
| B. | v₂²/2g |
| C. | 0.5 v₁²/2g |
| D. | 0.375 v₂²/2g |
| Answer» E. | |
| 657. |
The mechanical energy can be measured by |
| A. | Adiabatic expansion |
| B. | Isentropic compression |
| C. | Adiabatic compression |
| D. | Isentropic expansion View Answer |
| Answer» C. Adiabatic compression | |
| 658. |
The head loss at the entrance of the pipe is that at it’s exit |
| A. | equal to |
| B. | half |
| C. | twice |
| D. | four times View Answer |
| Answer» C. twice | |
| 659. |
As the specific speed increases, the slope of HQ curve |
| A. | Decreases |
| B. | Increases |
| C. | Independent |
| D. | Remains the same View Answer |
| Answer» D. Remains the same View Answer | |
| 660. |
Inward flow reaction turbine enter through |
| A. | Outer periphery |
| B. | Blades |
| C. | Inner periphery |
| D. | Pressure angle |
| Answer» B. Blades | |
| 661. |
Cavitation usually occurs due to the changes in |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Heat |
| Answer» B. Temperature | |
| 662. |
Reciprocating pumps has efficiency compared to centrifugal pumps |
| A. | Higher |
| B. | Lower |
| C. | Equal |
| D. | Exponential View Answer |
| Answer» C. Equal | |
| 663. |
Which among the following is the correct formula for drag? |
| A. | D = Cd * A * 0.5 * r * V2 |
| B. | D = Cd * A * 0.5 * r * V*2 |
| C. | D = Cd * A * 0.5 * r * V/2 |
| D. | D = 0.5 * r * V |
| Answer» B. D = Cd * A * 0.5 * r * V*2 | |
| 664. |
The simple elbow draft tube helps to cut down the cost of excavation. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 665. |
A quantity of fluid that leaks from a higher pressure discharge to a lower pressure discharge is called |
| A. | Slip |
| B. | Heat |
| C. | Friction |
| D. | Enthalpy View Answer |
| Answer» B. Heat | |
| 666. |
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» C. Discharge | |
| 667. |
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shearstress will be |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Could be any value |
| Answer» E. | |
| 668. |
Vertical pump uses |
| A. | Draft tube |
| B. | Throttle bush |
| C. | Stuffing box |
| D. | Interlining View Answer |
| Answer» C. Stuffing box | |
| 669. |
is an inward radial flow reaction turbine? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» D. Propeller turbine | |
| 670. |
Draft tube consists of conical diffuser with angles of |
| A. | 10 deg |
| B. | 20 deg |
| C. | 30 deg |
| D. | 40 deg |
| Answer» B. 20 deg | |
| 671. |
Constant head curves are also called as |
| A. | Head race curves |
| B. | Tail race curves |
| C. | Main characteristic curves |
| D. | Impeller curves |
| Answer» D. Impeller curves | |
| 672. |
The frictional resistance for fluids in motion varies |
| A. | slightly with temperature for both laminar and turbulent flows |
| B. | considerably with temperature for both laminar and turbulent flows |
| C. | slightly with temperature for laminar flow and considerably with temperature for turbulent flow |
| D. | considerably with temperature for laminar flow and slightly with temperature for turbulent flow View Answer |
| Answer» E. | |
| 673. |
Metacentric height for small values of angle of heel is the distance betweenthe |
| A. | centre of gravity and centre of buoy-ancy |
| B. | centre of gravity and metacentre |
| C. | centre of buoyancy and metacentre |
| D. | free surface and centre of buoyancy |
| Answer» C. centre of buoyancy and metacentre | |
| 674. |
At high pressure, the voids can generate |
| A. | Drag force |
| B. | Mass density |
| C. | Shock waves |
| D. | Flow speed |
| Answer» D. Flow speed | |
| 675. |
The relative velocity is obtained by the equation |
| A. | u – V1 |
| B. | V1 |
| C. | u*V1 |
| D. | u/V1 |
| Answer» B. V1 | |
| 676. |
The fluid gains while passing through the impeller. |
| A. | Velocity |
| B. | Pressure |
| C. | Temperature |
| D. | Velocity and pressure View Answer |
| Answer» E. | |
| 677. |
In nozzle governing, the flow rate of steam is regulated by |
| A. | Nozzles |
| B. | Pumping |
| C. | Drafting |
| D. | Intercooling |
| Answer» B. Pumping | |
| 678. |
Jet propulsion works on the principle of |
| A. | Newton’s first law |
| B. | Newton’s second law |
| C. | Newton’s third law |
| D. | Thermodynamic properties |
| Answer» D. Thermodynamic properties | |
| 679. |
In analytical approach, dp= |
| A. | vdt |
| B. | v |
| C. | dt |
| D. | dx |
| Answer» B. v | |
| 680. |
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» C. Radially outward | |
| 681. |
Which among the following is a friction factor? |
| A. | Newtons factor |
| B. | Darcy’s factor |
| C. | Transfer temperature |
| D. | Heizenberg’s factor View Answer |
| Answer» C. Transfer temperature | |
| 682. |
The Kaplan Turbine is an evolution of |
| A. | Francis turbine |
| B. | Pelton wheel |
| C. | Parsons turbine |
| D. | Curtis turbine |
| Answer» B. Pelton wheel | |
| 683. |
The main function of centrifugal pumps are to |
| A. | Transfer speed |
| B. | Transfer pressure |
| C. | Transfer temperature |
| D. | Transfer energy |
| Answer» E. | |
| 684. |
When the flow output is higher, impellers are connected in |
| A. | Series |
| B. | Parallel |
| C. | Equilibrium |
| D. | Series and parallel View Answer |
| Answer» C. Equilibrium | |
| 685. |
Unit speed is the speed of the turbine operating under_ |
| A. | One-meter head |
| B. | Pressure head |
| C. | Volumetric head |
| D. | Draft tube |
| Answer» B. Pressure head | |
| 686. |
is difference between head race and tail race |
| A. | Gross head |
| B. | Net head |
| C. | Net positive suction head |
| D. | Manometric head |
| Answer» B. Net head | |
| 687. |
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» D. Axial direction | |
| 688. |
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» C. Velocity tube | |
| 689. |
A gear pump uses |
| A. | Petrochemical pumps |
| B. | Meshing of gears |
| C. | Froth pumps |
| D. | Airlift pumps View Answer |
| Answer» C. Froth pumps | |
| 690. |
At what angle does the jet deflect after striking a stationery vertical plate? |
| A. | 30 |
| B. | 60 |
| C. | 90 |
| Answer» D. | |
| 691. |
The speed ratio (φ) varies directly with which of the following parameters? |
| A. | Vw1 |
| B. | V1 |
| C. | N (RPM) |
| D. | H (Available head) |
| Answer» D. H (Available head) | |
| 692. |
Head under which Kaplan turbine is operated |
| A. | 10-70 meters |
| B. | 70 -100 meters |
| C. | 100-200 meters |
| D. | Above 200 meters |
| Answer» B. 70 -100 meters | |
| 693. |
Efficiency of a draft tube is directly proportional to its |
| A. | Temperature |
| B. | Pressure |
| C. | Velocity |
| D. | Density |
| Answer» D. Density | |
| 694. |
During normal working operation, the pump works like |
| A. | Centrifugal pumps |
| B. | Self priming pumps |
| C. | Froth pumps |
| D. | Drive pumps View Answer |
| Answer» B. Self priming pumps | |
| 695. |
Which kind of turbine is a Pelton Wheel turbine? |
| A. | Tangential flow turbine. |
| B. | Radial flow turbine |
| C. | Outward flow turbine |
| D. | Inward flow turbine |
| Answer» B. Radial flow turbine | |
| 696. |
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» B. Radial outlet discharge | |
| 697. |
To avoid gas bounding, the pump is |
| A. | Heated |
| B. | Elevated |
| C. | Primed |
| D. | Charged View Answer |
| Answer» D. Charged View Answer | |
| 698. |
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» E. | |
| 699. |
With the increase in load, Energy in the turbine |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | Independent |
| Answer» B. Increases | |
| 700. |
What does BEP stand for? |
| A. | Best efficiency point |
| B. | Brake ejection point |
| C. | Break effect point |
| D. | Best effect point View Answer |
| Answer» B. Brake ejection point | |