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.
| 1801. |
Kinetic energy of fluid per unit weight represented by the velocity head is given by |
| A. | 2v²/gc |
| B. | v²/2gc |
| C. | ρv²/gc |
| D. | ρ.v²/2gc |
| Answer» C. ρv²/gc | |
| 1802. |
With increase in temperature, the vapor pressure of liquids |
| A. | Increases |
| B. | Increases linearly |
| C. | Decreases |
| D. | Remains constant |
| Answer» B. Increases linearly | |
| 1803. |
Which law is followed by the velocity distribution in the turbulent boundary layer? |
| A. | Parabolic law |
| B. | Linear law |
| C. | Logarithmic law |
| D. | None of these |
| Answer» D. None of these | |
| 1804. |
If more than two branches of pipes are to be connected at the same point, then use a/an |
| A. | Elbow |
| B. | Union |
| C. | Tee |
| D. | None of these |
| Answer» D. None of these | |
| 1805. |
Which of the following valves will incur maximum pressure drop for the same discharge of water? |
| A. | Globe valve |
| B. | Gate valve |
| C. | Needle valve |
| D. | Butterfly valve |
| Answer» D. Butterfly valve | |
| 1806. |
Mach number is the ratio of the speed of the |
| A. | Fluid to that of the light |
| B. | Light to that of the fluid |
| C. | Fluid to that of the sound |
| D. | Sound to that of the fluid |
| Answer» D. Sound to that of the fluid | |
| 1807. |
Cd for the orifice plate varies from |
| A. | 0.58 to 0.8 |
| B. | 0.93 to 0.98 |
| C. | 0.2 to 0.3 |
| D. | 0.02 to 0.03 |
| Answer» B. 0.93 to 0.98 | |
| 1808. |
Which of the following has the minimum compressibility? |
| A. | Water at room temperature |
| B. | Air at room temperature |
| C. | Oxygen at room temperature |
| D. | Nitrogen at room temperature |
| Answer» B. Air at room temperature | |
| 1809. |
Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum |
| A. | Flow rate |
| B. | Mean velocity |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» C. Both A & B | |
| 1810. |
Co-efficient of velocity is __________ the coefficient of discharge. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | Not related to |
| Answer» C. Equal to | |
| 1811. |
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed. |
| A. | Spouted |
| B. | Sluggish |
| C. | Boiling |
| D. | Teeter |
| Answer» B. Sluggish | |
| 1812. |
The terminal velocity of a small sphere settling in a viscous fluid varies as the |
| A. | First power of its dimeter |
| B. | Inverse of the fluid viscosity |
| C. | Inverse square of the diameter |
| D. | Square of the difference in specific weights of solid & fluid |
| Answer» C. Inverse square of the diameter | |
| 1813. |
Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor. |
| A. | Less than |
| B. | More than |
| C. | Same as |
| D. | None of these |
| Answer» C. Same as | |
| 1814. |
__________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm². |
| A. | Centrifugal |
| B. | Piston |
| C. | Plunger |
| D. | Vane |
| Answer» D. Vane | |
| 1815. |
Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as |
| A. | V1.8 |
| B. | V-0.2 |
| C. | V2.7 |
| D. | V2 |
| Answer» E. | |
| 1816. |
Priming of a centrifugal pump is done to |
| A. | Increase the mass flow rate of fluid |
| B. | Develop effective pressure rise by the pump |
| C. | Avoid chances of separation inside the impeller |
| D. | None of these |
| Answer» D. None of these | |
| 1817. |
Pick out the wrong statement about a streamline. |
| A. | It is always parallel to the main direction of the fluid flow |
| B. | It is a line across which there is no flow and it is equivalent to a rigid boundary |
| C. | Streamlines intersect at isolated point of zero velocity and infintie velocity |
| D. | The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity |
| Answer» B. It is a line across which there is no flow and it is equivalent to a rigid boundary | |
| 1818. |
Two liquids manometer is used for measuring small pressure differences in |
| A. | Liquids |
| B. | Gases |
| C. | Mixture of hydrocarbons |
| D. | None of these |
| Answer» C. Mixture of hydrocarbons | |
| 1819. |
The range of a particular rotameter can be increased by |
| A. | Use of floats of different densities |
| B. | No means |
| C. | Increasing the diameter of the float |
| D. | Decreasing the diameter of the float |
| Answer» B. No means | |
| 1820. |
For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary |
| A. | Directly as square of gas density |
| B. | Directly as gas density |
| C. | Directly as square root of gas density |
| D. | Inversely as gas density |
| Answer» C. Directly as square root of gas density | |
| 1821. |
A centrifugal pump loses prime after starting. The reason of this trouble may be |
| A. | Incomplete priming |
| B. | Too high a suction lift |
| C. | Low available NPSH and air leaks in the suction pipe |
| D. | All of the above |
| Answer» E. | |
| 1822. |
The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is |
| A. | 4(Ro-Ri) |
| B. | √(Ro-Ri) |
| C. | 2(Ro-Ri) |
| D. | Ro + Ri |
| Answer» D. Ro + Ri | |
| 1823. |
Air vessel of a reciprocating pump is initially filled with |
| A. | Atmospheric air |
| B. | Compressed air |
| C. | Water |
| D. | None of these |
| Answer» C. Water | |
| 1824. |
A piezometer provided in the pipe measures |
| A. | Friction factor |
| B. | Static pressure |
| C. | Dynamic pressure |
| D. | None of these |
| Answer» C. Dynamic pressure | |
| 1825. |
Which of the following factors does not contribute to the pressure drop in a pipeline ? |
| A. | Velocity of fluid |
| B. | Size of pipe |
| C. | Length of pipe and number of bends |
| D. | None of these |
| Answer» E. | |
| 1826. |
If in a flow field, between any two points, then the flow must be |
| A. | Steady, incompressible, irrotational |
| B. | Steady, compressible, irrotational |
| C. | Steady, compressible and along a streamline |
| D. | Unsteady, incompressible, irrotational |
| Answer» B. Steady, compressible, irrotational | |
| 1827. |
The valve commonly used in pipes larger than 2" dia is a |
| A. | Globe valve |
| B. | Plug-cock |
| C. | Gate valve |
| D. | Check valve |
| Answer» D. Check valve | |
| 1828. |
I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch |
| A. | 4.728 |
| B. | 0.5 |
| C. | 0.622 |
| D. | 0.474 |
| Answer» D. 0.474 | |
| 1829. |
Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd' |
| A. | D |
| B. | 0.5d |
| C. | 2d |
| D. | 4d |
| Answer» C. 2d | |
| 1830. |
For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively). |
| A. | Increase |
| B. | Decrease |
| C. | Remain constant |
| D. | Either A or B; depends on other factors |
| Answer» B. Decrease | |
| 1831. |
Maintenance cost of a __________ pump for a particular duty is the least. |
| A. | Centrifugal |
| B. | Reciprocating |
| C. | Volute |
| D. | Gear |
| Answer» B. Reciprocating | |
| 1832. |
The co-efficient of discharge of an orificemeter is a function of |
| A. | Reynolds number at the orifice |
| B. | Ratio of orifice dia to pipe dia |
| C. | Both A and B |
| D. | None of the above parameters, and has a constant value of 0.61 |
| Answer» D. None of the above parameters, and has a constant value of 0.61 | |
| 1833. |
Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density. |
| A. | Shear stress |
| B. | Shear force |
| C. | Average drag per unit projected area |
| D. | None of these |
| Answer» D. None of these | |
| 1834. |
A fluidis (μ/ρ = 0.01 cm²/sec) moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec. |
| A. | 7 |
| B. | 700 |
| C. | 7000 |
| D. | 630 |
| Answer» B. 700 | |
| 1835. |
A pressure head of 320 metres of water in meters of CCl₄ (sp.gr = 1.6) will be |
| A. | 100 |
| B. | 200 |
| C. | 320 |
| D. | 160 |
| Answer» C. 320 | |
| 1836. |
In a fully turbulent flow (Re > 105) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is |
| A. | d |
| B. | d2 |
| C. | d2.5 |
| D. | d4 |
| Answer» D. d4 | |
| 1837. |
The value of critical Reynolds number for pipe flow is |
| A. | 1300 |
| B. | 10,000 |
| C. | 100,000 |
| D. | None of these |
| Answer» B. 10,000 | |
| 1838. |
The unit of dynamic viscosity in SI unit is |
| A. | kg/m . sec |
| B. | N/m² |
| C. | m² /sec |
| D. | m/N. sec |
| Answer» B. N/m² | |
| 1839. |
A stream line is |
| A. | Fixed in space in steady flow |
| B. | Always the path of particle |
| C. | Drawn normal to the velocity vector at every point |
| D. | A line connecting the mid points of flow cross-section |
| Answer» B. Always the path of particle | |
| 1840. |
Boundary layer separation occurs when the |
| A. | Pressure reaches a minimum |
| B. | Cross-section of the channel is reduced |
| C. | Valve is closed in a pipeline |
| D. | Velocity of sound is reached |
| Answer» C. Valve is closed in a pipeline | |
| 1841. |
If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is |
| A. | Same in both the tubes |
| B. | Greater in 1 mm dia tube |
| C. | Greater in 0.5 mm dia tube |
| D. | Zero in both the tubes |
| Answer» D. Zero in both the tubes | |
| 1842. |
Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Data insufficient to predict pressure drop |
| Answer» B. Decrease | |
| 1843. |
Medium viscosity lubricating oil can be most ideally pumped by a __________ pump. |
| A. | Vane |
| B. | Piston |
| C. | Centrifugal |
| D. | Plunger |
| Answer» B. Piston | |
| 1844. |
Slurries can be most conveniently pumped by a __________ pump. |
| A. | Screw |
| B. | Reciprocating |
| C. | Gear |
| D. | Centrifugal |
| Answer» E. | |
| 1845. |
The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a |
| A. | Weir |
| B. | Pitot tube |
| C. | Kennison nozzle |
| D. | V-notch |
| Answer» C. Kennison nozzle | |
| 1846. |
The unit of bulk modulus of elasticity for a liquid in S.I. unit is |
| A. | N |
| B. | N/m |
| C. | N/m² |
| D. | N/m³ |
| Answer» D. N/m³ | |
| 1847. |
Net positive suction head (NPSH) of a centrifugal pump must be |
| A. | Greater than the vapour pressure of the liquid |
| B. | Less than the vapour pressure of the liquid |
| C. | Equal to the vapour pressure of the liquid |
| D. | Less than barometric pressure |
| Answer» B. Less than the vapour pressure of the liquid | |
| 1848. |
In magnetic flow meters, voltage generation is |
| A. | Due to the motion of conducting fluid through an externally generated uniform field |
| B. | Proportional to the fluid velocity |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1849. |
Lower BWG means __________ of the tube. |
| A. | Lower thickness |
| B. | Lower cross-section |
| C. | Outer diameter |
| D. | Inner diameter |
| Answer» C. Outer diameter | |
| 1850. |
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics. |
| A. | Piston |
| B. | Gear |
| C. | Positive displacement |
| D. | Sump |
| Answer» C. Positive displacement | |