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.
| 1851. |
Foot valves are provided in the suction line of a centrifugal pump to |
| A. | Avoid priming, every time we start the pump |
| B. | Remove the contaminant present in the liquid |
| C. | Minimise the fluctuation in discharge |
| D. | Control the liquid discharge |
| Answer» B. Remove the contaminant present in the liquid | |
| 1852. |
Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is |
| A. | 10√2π |
| B. | 5π/2 |
| C. | 5√2π |
| D. | 5π/√2 |
| Answer» C. 5√2π | |
| 1853. |
__________ is an example of axial flow impeller. |
| A. | Paddle |
| B. | Turbine |
| C. | Propeller |
| D. | All of the above |
| Answer» D. All of the above | |
| 1854. |
Rubber latex is an example of a __________ .fluid. |
| A. | Pseudoplastic |
| B. | Bingham plastic |
| C. | Dilatent |
| D. | Newtonion |
| Answer» B. Bingham plastic | |
| 1855. |
Two dimensional stream function |
| A. | Relates velocity and pressure |
| B. | Is constant along a stream line |
| C. | Is constant along an equipotential surface |
| D. | None of these |
| Answer» C. Is constant along an equipotential surface | |
| 1856. |
The most economical flow control valve for use with large diameter pipes is a |
| A. | Butterfly valve |
| B. | Globe valve |
| C. | Needle valve |
| D. | None of these |
| Answer» B. Globe valve | |
| 1857. |
Momentum transfer in laminar flow of fluids results due to the |
| A. | Viscosity |
| B. | Density |
| C. | Velocity gradient |
| D. | None of these |
| Answer» D. None of these | |
| 1858. |
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. |
| A. | P, Q and R |
| B. | P and R |
| C. | R and S |
| D. | P, Rand S |
| Answer» B. P and R | |
| 1859. |
For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively). |
| A. | G is above B |
| B. | B is above G |
| C. | B & G coincide |
| D. | None of these |
| Answer» C. B & G coincide | |
| 1860. |
What causes cavitation in centrifugal pump? |
| A. | High suction pressure |
| B. | Low barometric pressure |
| C. | Low suction pressure |
| D. | High suction velocity |
| Answer» D. High suction velocity | |
| 1861. |
Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics? |
| A. | Archimedes principle |
| B. | Newton |
| C. | Hooke |
| D. | Newton |
| Answer» D. Newton | |
| 1862. |
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of |
| A. | Relative roughness |
| B. | Absolute roughness |
| C. | Friction co-efficient for flows at equal Reynold number |
| D. | All of the above |
| Answer» D. All of the above | |
| 1863. |
A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp. |
| A. | 1 |
| B. | 10/55 |
| C. | 5.5 |
| D. | 1/55 |
| Answer» B. 10/55 | |
| 1864. |
Velocity distribution for flow between two fixed parallel plates |
| A. | Varies parabolically across the section |
| B. | Is constant over the entire cross-section |
| C. | Is zero at the plates and increases linearly to the midplane |
| D. | None of these |
| Answer» B. Is constant over the entire cross-section | |
| 1865. |
Cd is always __________ Cc. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Either more or less than |
| Answer» B. Less than | |
| 1866. |
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the |
| A. | Inverse of fluid viscosity |
| B. | Square of particle size |
| C. | Difference in the densities of the particle & fluid |
| D. | All of the above |
| Answer» E. | |
| 1867. |
Volute type of casing is provided in a centrifugal pump to |
| A. | Convert velocity head to pressure head |
| B. | Convert pressure head to velocity head |
| C. | Reduce the discharge fluctuation |
| D. | Increase the discharge |
| Answer» E. | |
| 1868. |
A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double |
| A. | Head |
| B. | Discharge |
| C. | Efficiency |
| D. | None of these |
| Answer» C. Efficiency | |
| 1869. |
Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around |
| A. | 2000 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» E. | |
| 1870. |
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). |
| A. | Q = Q₁ + Q₂ + Q₃ |
| B. | V₁ = V₂ = V₃ |
| C. | Q₁ = Q₂ = Q₃ |
| D. | F = f₁ + f₂ + f₃ |
| Answer» B. V₁ = V₂ = V₃ | |
| 1871. |
Vane anemometer |
| A. | Is an area meter |
| B. | Is a variable head meter |
| C. | Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed |
| D. | None of these |
| Answer» D. None of these | |
| 1872. |
Multistage compressors are used in industry, because they |
| A. | Reduce the cost of compressor |
| B. | Reduce the size requirement |
| C. | Resemble closely to isothermal compression |
| D. | Are easy to control |
| Answer» D. Are easy to control | |
| 1873. |
The __________ is measured by a piezometric opening. |
| A. | Dynamic pressure |
| B. | Static pressure |
| C. | Total pressure |
| D. | Point velocity |
| Answer» D. Point velocity | |
| 1874. |
The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid. |
| A. | Newtonion |
| B. | Pseudoplastic |
| C. | Dilatent |
| D. | Bingham plastic |
| Answer» C. Dilatent | |
| 1875. |
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is |
| A. | Δp |
| B. | < Δp |
| C. | > Δp |
| D. | Δp² |
| Answer» D. Δp² | |
| 1876. |
The head loss in turbulent flow in a pipe varies |
| A. | As velocity |
| B. | As (velocity)² |
| C. | Inversely as the square of diameter |
| D. | Inversely as the velocity |
| Answer» C. Inversely as the square of diameter | |
| 1877. |
A centrifugal pump is called a turbine pump, if it is having a |
| A. | Turbine type impeller |
| B. | Vaned diffusion casing |
| C. | Rotating vaned volute |
| D. | None of these |
| Answer» C. Rotating vaned volute | |
| 1878. |
Scale up of agitator design requires |
| A. | Geometrical similarity only |
| B. | Dynamic similarity only |
| C. | Both geometrical and dynamic similarity |
| D. | All of the above |
| Answer» E. | |
| 1879. |
Unit of mass velocity is |
| A. | Kg/hr |
| B. | Kg/m². hr |
| C. | Kg/m² |
| D. | Kg/m³. hr |
| Answer» C. Kg/m² | |
| 1880. |
The hydrodynamic and thermal boundary layers will merge, when |
| A. | Prandtl number is one |
| B. | Schmidt number tends to infinity |
| C. | Nusselt number tends to infinity |
| D. | Archimedes number is greater than 10000 |
| Answer» B. Schmidt number tends to infinity | |
| 1881. |
What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» B. 1 | |
| 1882. |
In laminar flow through a round tube, the discharge varies |
| A. | Linearly as the viscosity |
| B. | Inversely as the pressure drop |
| C. | Inversely as the viscosity |
| D. | As the square of the radius |
| Answer» D. As the square of the radius | |
| 1883. |
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases. |
| A. | NPSH required |
| B. | BHP required by the pump |
| C. | Head of the liquid pumped |
| D. | All of the above |
| Answer» E. | |
| 1884. |
For the transfer of solution of thick slurry, the pump used is a __________ pump. |
| A. | Reciprocating |
| B. | Gear |
| C. | Diaphragm |
| D. | Centrifugal |
| Answer» D. Centrifugal | |
| 1885. |
The bulk modulus of elasticity of a liquid |
| A. | Is zero for incompressible liquid |
| B. | Decreases with pressure |
| C. | Is independent of temperature & pressure |
| D. | Increases with pressure |
| Answer» E. | |
| 1886. |
A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 1887. |
Design of the casing of centrifugal pump should be such as to minimise the |
| A. | Back flow through impeller |
| B. | Loss of kinetic head |
| C. | Loss of static head |
| D. | None of these |
| Answer» C. Loss of static head | |
| 1888. |
Delivery of insufficient quantity of liquid by a pump may be caused by |
| A. | Air leak in the inlet |
| B. | Low rpm |
| C. | Too high a lift |
| D. | All of the above |
| Answer» E. | |
| 1889. |
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re |
| A. | Increases linearly with V |
| B. | Decreases linearly with V |
| C. | Decreases as V² |
| D. | None of these |
| Answer» B. Decreases linearly with V | |
| 1890. |
The equivalent diameter for flow through a rectangular duct of width B and height H is |
| A. | HB/2(H + B) |
| B. | HB/(H + B) |
| C. | 2HB/(H + B) |
| D. | 4HB/(H + B) |
| Answer» D. 4HB/(H + B) | |
| 1891. |
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is |
| A. | Q/2 |
| B. | Q/4 |
| C. | Q/8 |
| D. | Q/16 |
| Answer» E. | |
| 1892. |
Boiler feed water pump is usually a __________ pump. |
| A. | Reciprocating |
| B. | Gear |
| C. | Multistage centrifugal |
| D. | Diaphragm |
| Answer» D. Diaphragm | |
| 1893. |
The __________ pressure is measured by a static tube. |
| A. | Dynamic |
| B. | Static |
| C. | Total |
| D. | None of these |
| Answer» C. Total | |
| 1894. |
The distance between metacentre and __________ is called metacentric height. |
| A. | Water surface |
| B. | Centre of gravity |
| C. | Centre of buoyancy |
| D. | None of these |
| Answer» C. Centre of buoyancy | |
| 1895. |
The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid. |
| A. | Bingham |
| B. | Newtonion |
| C. | Perfect |
| D. | None of these |
| Answer» C. Perfect | |
| 1896. |
Turbine impeller |
| A. | Produces only radial current |
| B. | Produces only tangential current |
| C. | Is effective over wide range of viscosities |
| D. | Does not produce tangential current |
| Answer» D. Does not produce tangential current | |
| 1897. |
Path followed by water jet issuing from the bottom of a water tank will be a |
| A. | Parabola (vertex being at the opening) |
| B. | Hyperbola |
| C. | Horizontal straight line |
| D. | Zig-zag path (which is geometrically undefined) |
| Answer» B. Hyperbola | |
| 1898. |
Schedule number of a pipe, which is a measure of its wall thickness, is given by |
| A. | 1000 P'/S |
| B. | 100 P'/S |
| C. | 1000 S/P' |
| D. | 10000 P'/S |
| Answer» B. 100 P'/S | |
| 1899. |
Toothpaste is a |
| A. | Bingham plastic |
| B. | Pseudoplastic |
| C. | Newtonion liquid |
| D. | Dilatent |
| Answer» E. | |
| 1900. |
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity) |
| A. | 1/μ |
| B. | μ |
| C. | μ² |
| D. | 1/μ² |
| Answer» C. μ² | |