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.
| 2001. |
Purpose of relief valve in a reciprocating pump is to |
| A. | Protect the pump against developing excessive pressure |
| B. | Facilitate unidirectional flow of liquid |
| C. | Reduce the discharge pressure |
| D. | Control the rate of discharge |
| Answer» B. Facilitate unidirectional flow of liquid | |
| 2002. |
Interstage coolers are provided in a multistage compressor to |
| A. | Save power in compressing a given volume to a given pressure |
| B. | Cool the delivered air |
| C. | Achieve the exact delivery pressure |
| D. | None of these |
| Answer» B. Cool the delivered air | |
| 2003. |
The Prandtl pitot tube measures the |
| A. | Velocity at a point in the flow |
| B. | Pressure at a point |
| C. | Average flow velocity |
| D. | Pressure difference in pipe flow |
| Answer» B. Pressure at a point | |
| 2004. |
Major loss in sudden contraction in pipe flow is due to |
| A. | Boundary friction |
| B. | Flow contraction |
| C. | Expansion of flow after sudden contraction |
| D. | None of these |
| Answer» C. Expansion of flow after sudden contraction | |
| 2005. |
Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number? |
| A. | Fanning equation |
| B. | Blake-Pllummer equation |
| C. | Hagen-Poiseulle equation |
| D. | Kozney-Karman equation |
| Answer» C. Hagen-Poiseulle equation | |
| 2006. |
Power requirement of fans having constant wheel diameter varies __________ fan speed. |
| A. | As square of |
| B. | Directly as |
| C. | As cube of |
| D. | None of these |
| Answer» D. None of these | |
| 2007. |
Enamels and paints are generally __________ fluid. |
| A. | Reheopectic |
| B. | Pseudo-plastic |
| C. | Thixotropic |
| D. | Dilatant |
| Answer» C. Thixotropic | |
| 2008. |
The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid. |
| A. | Newtonion |
| B. | Dilatant |
| C. | Pseudoplastic |
| D. | Non-Newtonion |
| Answer» B. Dilatant | |
| 2009. |
Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible? |
| A. | < 0.3 |
| B. | > 3 |
| C. | 50 |
| D. | 1 |
| Answer» B. > 3 | |
| 2010. |
Hydraulic __________ works on the principle of Pascal's law of transmission of fluid pressure. |
| A. | Press |
| B. | Turbine |
| C. | Pump |
| D. | Coupling |
| Answer» B. Turbine | |
| 2011. |
With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity |
| A. | Widens |
| B. | Squeezes |
| C. | Does not change |
| D. | Unpredictable from the data |
| Answer» D. Unpredictable from the data | |
| 2012. |
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to |
| A. | √x |
| B. | 1/√x |
| C. | X |
| D. | 1/x |
| Answer» B. 1/√x | |
| 2013. |
Pipes having diameter 14 inches or more are designated by their |
| A. | Outside diameter |
| B. | Inside diameter |
| C. | Schedule number |
| D. | None of these |
| Answer» B. Inside diameter | |
| 2014. |
Which of the following conditions must be satisfied for lift force to be developed? |
| A. | The body should be bluff body |
| B. | The body should be stream lined |
| C. | Circulation around the body is essentially required |
| D. | The main stream velocity must approach the velocity of sound in that fluid medium |
| Answer» D. The main stream velocity must approach the velocity of sound in that fluid medium | |
| 2015. |
Viscosity of water at 40°C lies in the range of |
| A. | 1 x 10⁻³ to 2 x 10⁻³ kg/m.s |
| B. | 0.5 x 10⁻³ to 1 x 10⁻³ kg/m.s |
| C. | 1 to 2 kg/m.s |
| D. | 0.5 to 1 kg/m.s |
| Answer» C. 1 to 2 kg/m.s | |
| 2016. |
A pressure of 10 m head of water is equivalent to __________ kN/m². |
| A. | 98 |
| B. | 147 |
| C. | 196 |
| D. | 49 |
| Answer» B. 147 | |
| 2017. |
A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by |
| A. | Decreasing the size of the inlet pipe |
| B. | Increasing the size of the inlet pipe |
| C. | Lowering the pump position |
| D. | Both B and C |
| Answer» E. | |
| 2018. |
Purpose of air lift pump is to |
| A. | Compress air |
| B. | Lift compressed air |
| C. | Lift water from a well by using compressed air |
| D. | Lift air under negative pressure |
| Answer» D. Lift air under negative pressure | |
| 2019. |
Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) |
| A. | D = 1840 H0.5/N |
| B. | D = 1840 N/H0.5 |
| C. | H = 1840 D0.5/N |
| D. | D = 1840 H/N |
| Answer» B. D = 1840 N/H0.5 | |
| 2020. |
Working of a __________ pump characterises mixed flow. |
| A. | Turbine |
| B. | Piston |
| C. | Diaphragm |
| D. | None of these |
| Answer» B. Piston | |
| 2021. |
Horsepower requirement for given pump capacity depends upon the |
| A. | Specific gravity of the liquid |
| B. | Suction lift |
| C. | Discharge head |
| D. | All of the above |
| Answer» E. | |
| 2022. |
Propellers are |
| A. | Axial flow mixers |
| B. | Low speed impeller |
| C. | Used for mixingliquids of high viscosity |
| D. | Radial flow mixers |
| Answer» B. Low speed impeller | |
| 2023. |
Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the |
| A. | Wall roughness |
| B. | Reynolds number |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 2024. |
For the same flow rate of a fluid, the pressure drop is the least for |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Flow-nozzle |
| D. | Δp is same for all |
| Answer» B. Orificemeter | |
| 2025. |
__________ flow means the flow of incompressible fluid with no shear. |
| A. | Potential |
| B. | Streamline |
| C. | Creep |
| D. | Boundary layer |
| Answer» B. Streamline | |
| 2026. |
The co-efficient of drag and lift for an incompressible fluid depends on the |
| A. | Reynolds number |
| B. | Froude number |
| C. | Mach number |
| D. | All of the above |
| Answer» B. Froude number | |
| 2027. |
Steady uniform flow is represented by flow through a/an |
| A. | Long pipe at constant rate |
| B. | Long pipe at decreasing rate |
| C. | Expanding tube at constant rate |
| D. | None of these |
| Answer» B. Long pipe at decreasing rate | |
| 2028. |
Unsteady non-uniform flow is represented 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» D. Expanding tube at constant rate | |
| 2029. |
Unsteady uniform flow is represented 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» C. Expanding tube at increasing rate | |
| 2030. |
Prandtl mixing length is |
| A. | Applicable to laminar flow problems |
| B. | A universal constant |
| C. | Zero at the pipe wall |
| D. | None of these |
| Answer» D. None of these | |
| 2031. |
Power number is the ratio of |
| A. | Drag stress to inertial stress |
| B. | Inertial stress to drag stress |
| C. | Inertial stress to gravitational stress |
| D. | Gravitational stress to drag stress |
| Answer» B. Inertial stress to drag stress | |
| 2032. |
Potential flow is the flow of |
| A. | Compressible fluids with shear |
| B. | Compressible fluids with no shear |
| C. | Incompressible fluids with shear |
| D. | Incompressible fluids with no shear |
| Answer» E. | |
| 2033. |
Bernoull's equation does not apply to the functioning of a/an |
| A. | Venturimeter |
| B. | Orificem |
| C. | Pitot tube |
| D. | None of these |
| Answer» E. | |
| 2034. |
Plunger pumps are used for |
| A. | Higher pressure |
| B. | Slurries |
| C. | Viscous mass |
| D. | None of these |
| Answer» B. Slurries | |
| 2035. |
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 2036. |
Pressure gradient in the pipe flow is influenced by the |
| A. | Diameter of pipe |
| B. | Velocity of the fluid |
| C. | Density & viscosity of the fluid |
| D. | All of the above |
| Answer» E. | |
| 2037. |
When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an |
| A. | Ejector |
| B. | Blower |
| C. | Injector |
| D. | Airlift |
| Answer» E. | |
| 2038. |
Which of the following is used for pumping crude oil from oil well? |
| A. | Single stage centrifugal pump |
| B. | Gear pump |
| C. | Screw pump |
| D. | Duplex/triplex reciprocating pump |
| Answer» E. | |
| 2039. |
Which of the following is an undesirable property of a manometric liquid? |
| A. | Non-sticky & non-corrosive nature |
| B. | High vapour pressure |
| C. | Low viscosity & surface tension |
| D. | Low co-efficient of thermal expansion |
| Answer» C. Low viscosity & surface tension | |
| 2040. |
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an |
| A. | Weir |
| B. | Hot wire anemometer |
| C. | Cup and vane aneometer |
| D. | None of these |
| Answer» C. Cup and vane aneometer | |
| 2041. |
Specific speed for a centrifugal pump is |
| A. | N√Q/H3/4 |
| B. | N√Q/H2/3 |
| C. | N√Q/H1/4 |
| D. | N√Q/H |
| Answer» B. N√Q/H2/3 | |
| 2042. |
Draining of shallow pits or sump is done by a sump pump, which is a __________ pump. |
| A. | Single stage vertical |
| B. | Centrifugal |
| C. | Plunger |
| D. | Diffuser |
| Answer» B. Centrifugal | |
| 2043. |
Cavitation occurs in a centrifugal pump when the suction pressure is |
| A. | Less than the vapour pressure of the liquid at that temperature |
| B. | Greater than the vapour pressure of the liquid at that temperature |
| C. | Equal to the vapour pressure |
| D. | Equal to the developed head |
| Answer» B. Greater than the vapour pressure of the liquid at that temperature | |
| 2044. |
The head developed by a centrifugal pump is largely determined by the |
| A. | Power of the pump |
| B. | Nature of the liquid being pumped |
| C. | Angle of the vanes and the speed of the tip of the impeller |
| D. | Vapour pressure of the liquid |
| Answer» D. Vapour pressure of the liquid | |
| 2045. |
For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship. |
| A. | Logarithmic |
| B. | Linear |
| C. | Hyperbolic |
| D. | Parabolic |
| Answer» B. Linear | |
| 2046. |
For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship. |
| A. | Logarithmic |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Linear |
| Answer» C. Hyperbolic | |
| 2047. |
The velocity profile for turbulent flow through a closed conduit is |
| A. | Logarithmic |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Linear |
| Answer» B. Parabolic | |
| 2048. |
In which of the following cases, it is possible for flow to occur from low pressure to high pressure? |
| A. | Flow of liquid upward in a vertical pipe |
| B. | Flow through a converging section |
| C. | Flow of air downward in a pipe |
| D. | Impossible in a constant cross-section conduit |
| Answer» C. Flow of air downward in a pipe | |
| 2049. |
The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is |
| A. | Hyperbolic |
| B. | Parabolic |
| C. | Linear |
| D. | None of these |
| Answer» C. Linear | |
| 2050. |
With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the |
| A. | Velocity increases |
| B. | Pressure decreases |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |