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.
| 1601. |
In hindered settling, the particles are |
| A. | Placed farther from the wall |
| B. | Not affected by other particles and the wall |
| C. | Near each other |
| D. | None of these |
| Answer» D. None of these | |
| 1602. |
Volute of a centrifugal pump should be designed in a fashion, such that the |
| A. | Kinetic head gets converted into static head |
| B. | Moving stream gradually reduces velocity |
| C. | Mean velocity remains constant |
| D. | None of these |
| Answer» B. Moving stream gradually reduces velocity | |
| 1603. |
Fluid flow through a packed bed is represented by the __________ equation. |
| A. | Fanning's |
| B. | Ergun's |
| C. | Hagen-Poiseuille's |
| D. | None of these |
| Answer» C. Hagen-Poiseuille's | |
| 1604. |
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of |
| A. | Powder & grannular solids |
| B. | Liquids |
| C. | Low melting point semi-solids |
| D. | All of the above |
| Answer» E. | |
| 1605. |
A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be __________ cms. |
| A. | 17 |
| B. | 42 |
| C. | 84 |
| D. | 1.8 |
| Answer» B. 42 | |
| 1606. |
A centrifugal pump has the following specifications:Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, then the new head will be __________ metres. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 5.5 |
| Answer» B. 4 | |
| 1607. |
The maximum delivery pressure of compressors can be upto __________ atmospheres. |
| A. | 10 |
| B. | 100 |
| C. | 250 |
| D. | 1000 |
| Answer» E. | |
| 1608. |
The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as |
| A. | Evaporation |
| B. | Cavitation |
| C. | Sublimation |
| D. | Stripping |
| Answer» C. Sublimation | |
| 1609. |
Slugging in a fluidised bed can be avoided by using |
| A. | Tall narrow vessel |
| B. | Deep bed of solids |
| C. | Shallow beds of solids and proper choice of particle size |
| D. | Very large particles |
| Answer» D. Very large particles | |
| 1610. |
Drag is defined as the force exerted by the |
| A. | Fluid on the solid in a direction opposite to flow |
| B. | Fluid on the solid in the direction of flow |
| C. | Solid on the fluid |
| D. | None of these |
| Answer» C. Solid on the fluid | |
| 1611. |
The ratio of width to depth for the most economical rectangular section in open channel flow is |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1612. |
Minimum fluidisation velocity for a specific system depends upon the |
| A. | Particle size |
| B. | Fluid viscosity |
| C. | Density of both the particle & the fluid |
| D. | All of the above |
| Answer» E. | |
| 1613. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft³/sec. |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 1614. |
Piezometric head is the sum of the __________ heads. |
| A. | Elevation & kinetic energy |
| B. | Elevation & pressure |
| C. | Kinetic energy & pressure |
| D. | None of these |
| Answer» C. Kinetic energy & pressure | |
| 1615. |
A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ₀ = 10 KPa, is shared between flat parallel plates separated by a distance of 10⁻³ m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is |
| A. | 10 KPa |
| B. | 20 KPa |
| C. | 30 KPa |
| D. | 40 KPa |
| Answer» C. 30 KPa | |
| 1616. |
Which of the fluid forces are not considered in the Reynold's equation of flow? |
| A. | Viscous forces |
| B. | Turbulent forces |
| C. | Pressure forces |
| D. | Compressibility forces |
| Answer» E. | |
| 1617. |
The continuity equation of fluid mechanics utilises the principle of conservation of |
| A. | Momentum |
| B. | Mass |
| C. | Energy |
| D. | Both B & C |
| Answer» C. Energy | |
| 1618. |
A rotameter works on the principle of __________ pressure drop. |
| A. | Constant |
| B. | Variable |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» B. Variable | |
| 1619. |
Check valve is used for __________ flow. |
| A. | Very precise control of |
| B. | Unidirectional |
| C. | Multidirectional |
| D. | None of these |
| Answer» C. Multidirectional | |
| 1620. |
A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump. |
| A. | Sump |
| B. | Volute |
| C. | Vacuum |
| D. | Submerged |
| Answer» D. Submerged | |
| 1621. |
In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes |
| A. | Less than atmospheric pressure |
| B. | More than liquid vapor pressure |
| C. | Less than liquid vapor pressure |
| D. | More than atmospheric pressure |
| Answer» D. More than atmospheric pressure | |
| 1622. |
If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to |
| A. | x |
| B. | x/2 |
| C. | x/3 |
| D. | 2x/3 |
| Answer» B. x/2 | |
| 1623. |
The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by |
| A. | Cv . √(2gH) |
| B. | Cc . √(2gH) |
| C. | Cd . √(2gH) |
| D. | Cv . Va |
| Answer» B. Cc . √(2gH) | |
| 1624. |
Pressure co-efficient is the ratio of pressure forces to __________ forces. |
| A. | Gravity |
| B. | Inertial |
| C. | Viscous |
| D. | None of these |
| Answer» C. Viscous | |
| 1625. |
The pressure co-efficient is the ratio of pressure forces to __________ forces. |
| A. | Viscous |
| B. | Inertial |
| C. | Gravity |
| D. | Surface tension |
| Answer» B. Inertial | |
| 1626. |
Which of the following is dimensionless? |
| A. | Angular velocity |
| B. | Fanning friction factor |
| C. | Specific volume |
| D. | None of these |
| Answer» C. Specific volume | |
| 1627. |
Which of the following is not concerned with the fluid-particle interaction? |
| A. | Drag co-efficient |
| B. | Froude number |
| C. | Galileo number |
| D. | Weber number |
| Answer» E. | |
| 1628. |
Normal depth in open channel flow is the depth of flow in the channel |
| A. | Corresponding to uniform flow |
| B. | Measured normal to the channel bed |
| C. | Corresponding to steady flow |
| D. | None of these |
| Answer» B. Measured normal to the channel bed | |
| 1629. |
What causes convective acceleration in fluid flow? |
| A. | Steep slope in flow |
| B. | Unsteady nature of flow |
| C. | Non-uniformity of flow |
| D. | Turbulence in flow |
| Answer» D. Turbulence in flow | |
| 1630. |
Mass velocity is independent of temperature & pressure, when the flow is |
| A. | Unsteady through unchanged cross-section |
| B. | Steady through changing cross-section |
| C. | Steady and the cross-section is unchanged |
| D. | Unsteady and the cross-section is changed |
| Answer» D. Unsteady and the cross-section is changed | |
| 1631. |
Prandtl number is a measure of the |
| A. | Heat conduction to viscosity of a fluid |
| B. | Cp/Cv of a fluid |
| C. | Elastic force to pressure force in the fluid flow |
| D. | Inertial force to elastic force in the fluid flow |
| Answer» B. Cp/Cv of a fluid | |
| 1632. |
Hydraulic radius is the ratio of |
| A. | Wetted perimeter to flow area |
| B. | Flow area to wetted perimeter |
| C. | Flow area to square of wetted perimeter |
| D. | Square root of flow area to wetted perimeter |
| Answer» C. Flow area to square of wetted perimeter | |
| 1633. |
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow). |
| A. | Re |
| B. | √Re |
| C. | 1/Re |
| D. | Re-1/2 |
| Answer» E. | |
| 1634. |
Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' diamensions, the quantities can be arranged into __________ independent dimensionless parameters. |
| A. | M |
| B. | N |
| C. | N-m |
| D. | N/m |
| Answer» D. N/m | |
| 1635. |
Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Be quadrupled |
| Answer» B. Decrease | |
| 1636. |
For flow of fluids through packed bed, the superficial velocity is |
| A. | Less than the average velocity through channels |
| B. | More than the average velocity through channels |
| C. | Dependent on the pressure drop across the bed |
| D. | Same as the average velocity through channels |
| Answer» B. More than the average velocity through channels | |
| 1637. |
Centrifugal compressors compared to reciprocating compressors |
| A. | Require less space |
| B. | Have quieter operation |
| C. | Have lower operating costs |
| D. | All of the above |
| Answer» E. | |
| 1638. |
In case of laminar flow of fluid through a circular pipe, the |
| A. | Shear stress over the cross-section is proportional to the distance from the surface of the pipe |
| B. | Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder |
| C. | Velocity profile varies hyperbolically and the shear stress remains constant over the cross-section |
| D. | Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius) |
| Answer» C. Velocity profile varies hyperbolically and the shear stress remains constant over the cross-section | |
| 1639. |
In case of turbulent flow of fluid through a circular pipe, the |
| A. | Mean flow velocity is about 0.5 times the maximum velocity |
| B. | Velocity profile becomes flatter and flatter with increasing Reynolds number |
| C. | Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius) |
| D. | Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more |
| Answer» E. | |
| 1640. |
A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres. |
| A. | 600 |
| B. | 660 |
| C. | 1.1 |
| D. | 60 |
| Answer» C. 1.1 | |
| 1641. |
Stoke's equation is valid in the Reynolds number range |
| A. | 0.01 to 0.1 |
| B. | 0.1 to 2 |
| C. | 2 to 10 |
| D. | 10 to 100 |
| Answer» B. 0.1 to 2 | |
| 1642. |
The vent valve provided in a liquid handling centrifugal pump is |
| A. | Generally a needle valve |
| B. | Used to release any gases that might be vapour locking the pump |
| C. | Helpful in easy removal of samples |
| D. | All of the above |
| Answer» E. | |
| 1643. |
The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the |
| A. | Static submergence |
| B. | Net positive suction head (NPSH) |
| C. | Cavitation sensitivity |
| D. | Priming |
| Answer» C. Cavitation sensitivity | |
| 1644. |
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the |
| A. | Discharge |
| B. | Suction |
| C. | Suction minus vapor pressure of the liquid at suction temperature |
| D. | Discharge minus vapor pressure of the liquid at the discharge temperature |
| Answer» D. Discharge minus vapor pressure of the liquid at the discharge temperature | |
| 1645. |
The fluid property, due to which, mercury does not wet the glass is |
| A. | Surface tension |
| B. | Viscosity |
| C. | Cohesion |
| D. | Adhesion |
| Answer» B. Viscosity | |
| 1646. |
The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1647. |
For the same terminal conditions and fitting size, the least friction loss is incurred in a/an |
| A. | T-joint |
| B. | Union |
| C. | 45° elbow |
| D. | 90°bend |
| Answer» C. 45° elbow | |
| 1648. |
Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions. |
| A. | Re << 1, accelerating flow |
| B. | Re >> 1, accelerating flow |
| C. | Re << 1, decelerating flow |
| D. | Re >>1, decelerating flow |
| Answer» E. | |
| 1649. |
The ratio of pressure forces to inertial forces is called the __________ number. |
| A. | Froude |
| B. | Euler |
| C. | Reynold |
| D. | Mach |
| Answer» C. Reynold | |
| 1650. |
The ratio of inertial forces to gravity forces is called the __________ number. |
| A. | Mach |
| B. | Froude |
| C. | Euler |
| D. | Weber |
| Answer» C. Euler | |