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.
| 1701. |
Most of the centrifugal pumps used in chemical plants are usually __________ driven. |
| A. | Steam |
| B. | Diesel engine |
| C. | Electric motor |
| D. | Gas turbine |
| Answer» D. Gas turbine | |
| 1702. |
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to |
| A. | L ρv²/D |
| B. | L μ;V/D² |
| C. | D ρv²/L |
| D. | Μ V/L |
| Answer» B. L μ;V/D² | |
| 1703. |
The frictional resistance in laminar flow does not depend on the |
| A. | Area of surface in contact |
| B. | Flow velocity |
| C. | Fluid temperature |
| D. | Pressure of flow |
| Answer» B. Flow velocity | |
| 1704. |
A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid. |
| A. | Newtonion |
| B. | Non-Newtonion |
| C. | Ideal |
| D. | Incompressible |
| Answer» B. Non-Newtonion | |
| 1705. |
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer. |
| A. | U-tube water |
| B. | U-tube mercury |
| C. | Inclined tube mercury |
| D. | Inclined tube water |
| Answer» E. | |
| 1706. |
For an incompressible fluid, the bulk modulus of elasticity is |
| A. | 5 kg/m³ |
| B. | ∞ N/m² |
| C. | 1 N |
| D. | 0 N/m |
| Answer» C. 1 N | |
| 1707. |
Drag force acting on a body does not depend upon the |
| A. | Density of the fluid |
| B. | Density of the body |
| C. | Velocity of the body |
| D. | Projected area of the body |
| Answer» C. Velocity of the body | |
| 1708. |
For an unstable equilibrium of a floating body (where, M = metacentre.) |
| A. | M is above G |
| B. | M is below G |
| C. | M & G coincide |
| D. | None of these |
| Answer» C. M & G coincide | |
| 1709. |
The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is |
| A. | 0.3 |
| B. | 0.9 |
| C. | 0.03 |
| D. | 0.66 |
| Answer» B. 0.9 | |
| 1710. |
Gradually varied flow in open channel is a/an __________ flow. |
| A. | Steady uniform |
| B. | Steady non-uniform |
| C. | Unsteady uniform |
| D. | Unsteady non-uniform |
| Answer» C. Unsteady uniform | |
| 1711. |
Fluid resistance to shear depends upon its |
| A. | Rate of transfer of molecular momentum |
| B. | Cohesion |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1712. |
An ideal nozzle design aims at |
| A. | Minimising wall friction |
| B. | Suppressing boundary layer separation |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1713. |
Gradually varying fluid flow is an example of __________ flow. |
| A. | Non-steady uniform |
| B. | Non-steady non-uniform |
| C. | Steady uniform |
| D. | Steady non-uniform |
| Answer» B. Non-steady non-uniform | |
| 1714. |
The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow. |
| A. | Steady uniform |
| B. | Steady non uniform |
| C. | Unsteady uniform |
| D. | Unsteady non uniform |
| Answer» C. Unsteady uniform | |
| 1715. |
Fluid flow at increasing rate through a diverging pipe is an example of __________ flow. |
| A. | Steady uniform |
| B. | Non-steady uniform |
| C. | Steady non-uniform |
| D. | Non-steady non-uniform |
| Answer» E. | |
| 1716. |
Non-colloidal solution is an example of the __________ fluid. |
| A. | Non-Newtonion |
| B. | Newtonion |
| C. | Dilatent |
| D. | Pseudoplastic |
| Answer» C. Dilatent | |
| 1717. |
Sewage sludge is an example of the __________ fluid. |
| A. | Bingham plastic |
| B. | Newtonion |
| C. | Pseudoplastic |
| D. | Dilatent |
| Answer» B. Newtonion | |
| 1718. |
What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta? |
| A. | 0.64 |
| B. | 1.65 |
| C. | 0.32 |
| D. | 0.94 |
| Answer» B. 1.65 | |
| 1719. |
Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid |
| A. | Lies above the centroid of the plane surface |
| B. | Is independent of the specific weight of the fluid |
| C. | Is different for different fluids |
| D. | Is at the centroid of the plane surface |
| Answer» C. Is different for different fluids | |
| 1720. |
Friction produced by the formation of wakes is called the __________ friction. |
| A. | Disk |
| B. | Skin |
| C. | Form |
| D. | None of these |
| Answer» D. None of these | |
| 1721. |
The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the __________ equation. |
| A. | Nikuradse |
| B. | Von-Karman |
| C. | Blausius |
| D. | Colebrook |
| Answer» B. Von-Karman | |
| 1722. |
The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration. |
| A. | Normal |
| B. | Local |
| C. | Convective |
| D. | Tangential |
| Answer» C. Convective | |
| 1723. |
Which of the following two quantities when same, makes one pipe system equivalent to another pipe system? |
| A. | Head & discharge |
| B. | Length & discharge |
| C. | Length & diameter |
| D. | Friction factor & diameter |
| Answer» B. Length & discharge | |
| 1724. |
The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by |
| A. | 4x |
| B. | 2x |
| C. | x |
| D. | √x |
| Answer» D. √x | |
| 1725. |
The pipe wall thickness is minimum for a pipe of given nominal size having schedule number |
| A. | 160 |
| B. | 120 |
| C. | 80 |
| D. | 40 |
| Answer» E. | |
| 1726. |
Propeller type centrifugal pumps are most suitable for |
| A. | High capacity at high heads |
| B. | High capacity at low heads |
| C. | Low capacity at high heads |
| D. | Low capacity at low heads |
| Answer» C. Low capacity at high heads | |
| 1727. |
Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have |
| A. | Very low speeds |
| B. | Smaller discharge |
| C. | Higher capital &maintenance cost |
| D. | High vibrations |
| Answer» D. High vibrations | |
| 1728. |
For a reciprocating pump, the indicator diagram is the graph between the |
| A. | Discharge and overall efficiency |
| B. | Volume swept by piston for one complete revolution and the pressure in the cylinder |
| C. | Angle swept by the crank pin at any instant and the discharge |
| D. | None of these |
| Answer» C. Angle swept by the crank pin at any instant and the discharge | |
| 1729. |
The most serious disadvantage of an orificemeter is that |
| A. | It is not very accurate |
| B. | It is very costly |
| C. | Most of the pressure drop is not recoverable |
| D. | It is not suitable for measuring gas flow |
| Answer» D. It is not suitable for measuring gas flow | |
| 1730. |
The ratio of wall drag to total drag in the Stoke's law range is |
| A. | 0.5 |
| B. | 1 |
| C. | 1/3 |
| D. | 2/3 |
| Answer» E. | |
| 1731. |
Which of the following quantities are computed by using the hydraulic radius for non-circular ducts? |
| A. | Velocity and relative roughness |
| B. | Head loss and velocity |
| C. | Reynold number, relative roughness and head loss |
| D. | Reynolds number and friction factor |
| Answer» D. Reynolds number and friction factor | |
| 1732. |
Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump. |
| A. | Reciprocating |
| B. | Plunger |
| C. | Electromagnetic |
| D. | Gear |
| Answer» D. Gear | |
| 1733. |
The fluid property which matters for fall-ing rain drops to acquire spherical shape is its |
| A. | Pressure |
| B. | Height of descend |
| C. | Viscosity |
| D. | Surface tension |
| Answer» E. | |
| 1734. |
A floating/submerged body is always stable, if its centre of gravity |
| A. | Lies above its centre of buoyancy |
| B. | And centre of buoyancy coincide |
| C. | Lies below its centre of buoyancy |
| D. | Lies above its meta centre |
| Answer» D. Lies above its meta centre | |
| 1735. |
Potential function is applicable only for __________ flow. |
| A. | Irrotational |
| B. | Turbulent |
| C. | Steady |
| D. | None of these |
| Answer» B. Turbulent | |
| 1736. |
A venturimeter measures the |
| A. | Velocity head |
| B. | Pressure |
| C. | Point velocity |
| D. | None of these |
| Answer» E. | |
| 1737. |
The schedule number of a pipe is an indication of its |
| A. | Size |
| B. | Roughness |
| C. | Material density |
| D. | Wall thickness |
| Answer» E. | |
| 1738. |
A perfect gas |
| A. | Does not satisfy PV = nRT |
| B. | Is incompressible and has zero viscosity |
| C. | Has constant specific heat |
| D. | Can't develop shear stresses |
| Answer» D. Can't develop shear stresses | |
| 1739. |
With increase in the schedule number of a pipe of a particular nominal size, the |
| A. | Wall thickness also increases |
| B. | I.D. of the pipe decreases |
| C. | O.D. of the pipe remains constant |
| D. | All of the above |
| Answer» E. | |
| 1740. |
A Newtonion fluid is that |
| A. | Which follows Newton |
| B. | Which needs a minimum shear, before it starts deforming |
| C. | For which shear & deformation are related as T = μ ∂u/∂y |
| D. | None of these |
| Answer» D. None of these | |
| 1741. |
A mixed flow centrifugal pump |
| A. | Employs such an impeller, through which the flow is a combination of radial & axial flow |
| B. | Mixes the two fluids before pumping them |
| C. | Pumps the two fluids separately and then mixes them |
| D. | Employs impellers in both the radial & axial directions |
| Answer» B. Mixes the two fluids before pumping them | |
| 1742. |
Which of the following may be termed as a variable orifice flowmeter? |
| A. | Rotameter |
| B. | Pitot tube |
| C. | V-notch |
| D. | All of the above |
| Answer» B. Pitot tube | |
| 1743. |
The specific speed of a pump is defined as the speed of a unit of such a size, that it |
| A. | Delivers unit discharge at unit head |
| B. | Requires unit power for unit head |
| C. | Delivers unit discharge at unit power |
| D. | None of these |
| Answer» B. Requires unit power for unit head | |
| 1744. |
A tube is specified by its |
| A. | Thickness only |
| B. | Outer diameter only |
| C. | Thickness & outer diameter both |
| D. | Inner diameter |
| Answer» D. Inner diameter | |
| 1745. |
A streamline is |
| A. | The line connecting the mid-points of flow cross-sections |
| B. | Defined for uniform flow only |
| C. | Drawn normal to the velocity vector at every point |
| D. | Always the path of a particle |
| Answer» D. Always the path of a particle | |
| 1746. |
A relief valve |
| A. | Provides back pressure for a cylinder |
| B. | Unloads a pump |
| C. | Is a directional control valve |
| D. | None of these |
| Answer» D. None of these | |
| 1747. |
A gas |
| A. | Signifies absence of density |
| B. | Can resist shearing action |
| C. | Is incompressible |
| D. | Is a supercritical vapor |
| Answer» E. | |
| 1748. |
Slugging occurs in a fluidised bed, if the bed is |
| A. | Narrow |
| B. | Deep |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1749. |
A fluid is the one, which |
| A. | Cannot remain at rest under the action of shear force |
| B. | Continuously expands till it fills any container |
| C. | Is incompressible |
| D. | Permanently resists distortion |
| Answer» B. Continuously expands till it fills any container | |
| 1750. |
A fluid is a substance, that |
| A. | Has to be kept in a closed container |
| B. | Is almost incompressible |
| C. | Has zero shear stress |
| D. | Flows when even a small shear is applied to it |
| Answer» E. | |