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.
| 1551. |
Ratio of pressure and inertia force gives __________ number. |
| A. | Weber |
| B. | Mach |
| C. | Euler |
| D. | Froude |
| Answer» D. Froude | |
| 1552. |
For ideally incompressible fluid, the Mach number will be |
| A. | 1.5 |
| B. | 1 |
| C. | 0 |
| D. | 5 |
| Answer» C. 0 | |
| 1553. |
For an ideal fluid flow, Reynolds number is |
| A. | 2100 |
| B. | 100 |
| C. | 0 |
| D. | ∞ |
| Answer» E. | |
| 1554. |
Deformation drag, which is caused by widespread deformation of fluid around the immersed body |
| A. | Occurs when NRe is very small |
| B. | Is primarily a friction drag |
| C. | Is independent of body length |
| D. | Depends mainly on cross-sectional shape |
| Answer» B. Is primarily a friction drag | |
| 1555. |
What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition? |
| A. | 0.5 |
| B. | 0.67 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 1556. |
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1557. |
Momentum correction factor used in fluid flow problems accounts for the |
| A. | Change in direction of flow |
| B. | Change in total energy |
| C. | Change in pressure |
| D. | Non uniform direction of velocities at inlet & outlet sections |
| Answer» E. | |
| 1558. |
Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter. |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Eight |
| Answer» D. Eight | |
| 1559. |
Air vessel fitted to a reciprocating pump |
| A. | Increases the work done |
| B. | Decreases the work done |
| C. | Causes cavitation |
| D. | Results in non-uniform discharge |
| Answer» C. Causes cavitation | |
| 1560. |
With increasing flow rate, the hydraulic efficiency of a centrifugal pump |
| A. | Monotonically decreases |
| B. | Decreases and then increases |
| C. | Remains constant |
| D. | Increases and then decreases |
| Answer» B. Decreases and then increases | |
| 1561. |
Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float) |
| A. | Df + Bf = Wf |
| B. | Df = Bf + Wf |
| C. | Df + Bf + Wf =0 |
| D. | None of these |
| Answer» B. Df = Bf + Wf | |
| 1562. |
A free jet of water of cross-sectional area 0.01m² and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is |
| A. | 200 N |
| B. | 400 N |
| C. | 2000 N |
| D. | 4000 N |
| Answer» E. | |
| 1563. |
Absolute viscosity of a fluid is a function of the __________ of the fluid. |
| A. | Motion |
| B. | Pressure & temperature |
| C. | Shearing stress |
| D. | Both B & C |
| Answer» E. | |
| 1564. |
The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 3 |
| Answer» B. 1 | |
| 1565. |
The valve used for very remote and accurate control of fluid is a __________ valve. |
| A. | Needle |
| B. | Globe |
| C. | Gate |
| D. | Butterfly |
| Answer» B. Globe | |
| 1566. |
Reynolds number is the ratio of |
| A. | Viscous forces to gravity forces |
| B. | Inertial forces to viscous forces |
| C. | Viscous forces to inertial forces |
| D. | Inertial forces to gravity forces |
| Answer» C. Viscous forces to inertial forces | |
| 1567. |
In case of a pipe exit fitted with a nozzle, the |
| A. | Conversion of kinetic head to pressure head is facilitated |
| B. | Conversion of pressure head to kinetic head is facilitated |
| C. | Power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head |
| D. | Both B and C |
| Answer» E. | |
| 1568. |
Drag is the force component exerted on an immersed object, |
| A. | Passing the centroid of the body at 60°to the direction of motion |
| B. | The component being parallel to theflow direction |
| C. | The component being normal to the flow direction |
| D. | None of these |
| Answer» C. The component being normal to the flow direction | |
| 1569. |
Quicksand is an example of a __________ fluid. |
| A. | Bingham plastic |
| B. | Dilatent |
| C. | Newtonion |
| D. | Pseudoplastic |
| Answer» C. Newtonion | |
| 1570. |
Which is the most efficient and best for measuring very small flow rate of gases? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Rotameter |
| D. | Flow nozzle |
| Answer» D. Flow nozzle | |
| 1571. |
A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid. |
| A. | Newtonion |
| B. | Viscous |
| C. | Dilatant |
| D. | Non-viscous |
| Answer» D. Non-viscous | |
| 1572. |
With increase in the temperature, viscosity of a liquid |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease; depends on the liquid |
| Answer» C. Remains constant | |
| 1573. |
In case of centrifugal fan or blower, the gas capacity varies as |
| A. | Speed |
| B. | (speed)2 |
| C. | (speed)3 |
| D. | (speed)0.5 |
| Answer» B. (speed)2 | |
| 1574. |
What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir? |
| A. | Penstock |
| B. | Siphon |
| C. | Tunnel |
| D. | Pressure pipeline |
| Answer» C. Tunnel | |
| 1575. |
What is the ratio of fluid carrying capacity of two pipes having diameters d₁ and d₂ respectively? |
| A. | (d₁/d₂)0.8 |
| B. | (d₁/d₂)0.5 |
| C. | (d₁/d₂) |
| D. | (d₁/d₂)2 |
| Answer» C. (d₁/d₂) | |
| 1576. |
To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump. |
| A. | Reciprocating |
| B. | Centrifugal |
| C. | Volute |
| D. | Rotary vacuum |
| Answer» B. Centrifugal | |
| 1577. |
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the |
| A. | Square of the radial distance |
| B. | Radial distance linearly |
| C. | Inverse of the radial distance |
| D. | Elevation along vertical direction |
| Answer» B. Radial distance linearly | |
| 1578. |
The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density. |
| A. | Directly as |
| B. | Inversely as square root of |
| C. | Inversely as |
| D. | As square of |
| Answer» B. Inversely as square root of | |
| 1579. |
Boundary layer separation is caused by the |
| A. | Reduction of pressure to vapour pressure |
| B. | Boundary layer thickness reducing to zero |
| C. | Adverse pressure gradient |
| D. | Reduction of pressure gradient to zero |
| Answer» E. | |
| 1580. |
The rate of shear versus the shear stress curves are time dependent for __________ fluid. |
| A. | Thixotropic |
| B. | Rheopectic |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1581. |
Each term of the Bernoulli's equation written in the form, P/ρ + g/gc .Z + v²/2gc = constant , represents the total energy per unit |
| A. | Mass |
| B. | Volume |
| C. | Specific weight |
| D. | None of these |
| Answer» B. Volume | |
| 1582. |
Head developed by a centrifugal pump depends on its |
| A. | Speed |
| B. | Impeller diameter |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1583. |
Pick out the correct statement pertaining to transition/ entrance length in fluid flow. |
| A. | The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length |
| B. | Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.NRe |
| C. | Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D |
| D. | All of the above |
| Answer» E. | |
| 1584. |
The dimension of dynamic viscosity is |
| A. | ML⁻¹T⁻¹ |
| B. | L²T⁻¹ |
| C. | LT⁻² |
| D. | ML⁻¹T⁻² |
| Answer» B. L²T⁻¹ | |
| 1585. |
The energy equation, E + P/ρ + V²/2g +gZ (E = internal energy/mass), is applicable to |
| A. | Perfect gases only |
| B. | Isothermal flow of gases |
| C. | Adiabatic unsteady flow of gases |
| D. | All of the above |
| Answer» E. | |
| 1586. |
Specific speed of a centrifugal pump depends upon the __________ head. |
| A. | Suction |
| B. | Delivery |
| C. | Manometric |
| D. | None of these |
| Answer» E. | |
| 1587. |
Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds |
| A. | 4000 |
| B. | 2100 |
| C. | 1500 |
| D. | 3000 |
| Answer» C. 1500 | |
| 1588. |
Creeping flow around a sphere is defined, when particle Reynolds number is |
| A. | < 2100 |
| B. | < 0.1 |
| C. | > 2.5 |
| D. | < 500 |
| Answer» C. > 2.5 | |
| 1589. |
Pressure drop in a packed bed for laminar flow is given by the __________ equation. |
| A. | Kozney-Karman |
| B. | Blake-Plummer |
| C. | Leva's |
| D. | Fanning friction factor |
| Answer» B. Blake-Plummer | |
| 1590. |
Pressure drop in packed bed for turbulent flow is given by the __________ equation. |
| A. | Kozney-Karman |
| B. | Blake-Plummer |
| C. | Leva's |
| D. | Hagen-Poiseulle's |
| Answer» C. Leva's | |
| 1591. |
Steady non-uniform flow is exemplified by flow through a/an |
| A. | Long pipe at constant rate |
| B. | Long pipe at decreasing rate |
| C. | Expanding tube at increasing rate |
| D. | Expanding tube at constant rate |
| Answer» E. | |
| 1592. |
An equipotential line is __________ to the velocity vector at every point. |
| A. | Normal |
| B. | Normal |
| C. | Tangential |
| D. | None of these |
| Answer» B. Normal | |
| 1593. |
Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation? |
| A. | Decrease in effect |
| B. | Increase in thrust |
| C. | Develops noise |
| D. | Develops high pressure |
| Answer» E. | |
| 1594. |
Cavitation in a centrifugal pump results from |
| A. | High discharge pressure |
| B. | Low barometric pressure |
| C. | High discharge velocity |
| D. | High discharge rate |
| Answer» C. High discharge velocity | |
| 1595. |
Which of the following must be followed by the flow of a fluid (real or ideal)?(I) Newton's law of viscosity.(II) Newton's second law of motion.(III) The continuity equation.(IV) Velocity of boundary layer must be zero relative to boundary.(V) Fluid cannot penetrate a boundary. |
| A. | I, II, III |
| B. | II, III, V |
| C. | I, II, V |
| D. | II, IV, V |
| Answer» C. I, II, V | |
| 1596. |
Cavitation in a centrifugal pump can be avoided by keeping the |
| A. | Inlet pressure high |
| B. | Outlet pressure low |
| C. | Inlet pressure low |
| D. | Outlet pressure high |
| Answer» B. Outlet pressure low | |
| 1597. |
The ratio of inertial forces to viscous forces is called the __________ number. |
| A. | Weber |
| B. | Mach |
| C. | Froude |
| D. | Reynold |
| Answer» E. | |
| 1598. |
Ratio of inertial forces to surface tension forces is called the __________ number. |
| A. | Euler |
| B. | Froude |
| C. | Mach |
| D. | Weber |
| Answer» E. | |
| 1599. |
For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | More or less, depending on the type of particle |
| Answer» B. Less | |
| 1600. |
The main factor on which the behaviour of a mass of fluidised solid depends mainly is the |
| A. | Fluid characteristics |
| B. | Particle size |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |