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.
| 1901. |
Cp/Cv is termed as |
| A. | Adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 1902. |
In deriving Bernoulli's equation, fluid is assumed to be |
| A. | Incompressible, frictionless, steady, along a streamline |
| B. | Uniform, steady, incompressible, along a streamline |
| C. | Steady, density being pressure dependent, frictionless |
| D. | None of these |
| Answer» B. Uniform, steady, incompressible, along a streamline | |
| 1903. |
In power law, ζ = A (du/dy)² + B , then the fluid is |
| A. | Newtonian |
| B. | Dilatant |
| C. | Thixotropic |
| D. | Rheopectic |
| Answer» B. Dilatant | |
| 1904. |
Capillary tube method of viscosity measurement is based on the |
| A. | Hagen-Poiseulle's equation |
| B. | Stoke's law |
| C. | Navier-stokes equation |
| D. | None of these |
| Answer» B. Stoke's law | |
| 1905. |
Transition from laminar flow to turbulent flow is aided by the |
| A. | Surface roughness and curvature (i.e.sharp corners) |
| B. | Vibration |
| C. | Pressure gradient and the compressibility of the flowing medium |
| D. | All of the above |
| Answer» E. | |
| 1906. |
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the |
| A. | Pipe length |
| B. | Fluid velocity in the pipe |
| C. | Time taken to close the valve |
| D. | All of the above |
| Answer» E. | |
| 1907. |
Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg. |
| A. | 1 |
| B. | 0.1 |
| C. | 0.01 |
| D. | 0.001 |
| Answer» D. 0.001 | |
| 1908. |
In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is |
| A. | Constant along a streamline |
| B. | Not constant along a streamline |
| C. | Increased in the direction of flow |
| D. | None of these |
| Answer» C. Increased in the direction of flow | |
| 1909. |
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition. |
| A. | ∂/∂t = 0 |
| B. | ∂/∂t = constant |
| C. | ∂/∂s = 0 |
| D. | ∂/∂t = constant |
| Answer» D. ∂/∂t = constant | |
| 1910. |
Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition. |
| A. | ∂/∂s = 0 |
| B. | ∂/∂t = 0 |
| C. | ∂/∂s = constant |
| D. | ∂/∂t = constant |
| Answer» C. ∂/∂s = constant | |
| 1911. |
Euler's equation of motion is a statement expressing |
| A. | Conservation of mass |
| B. | Conservation of energy |
| C. | Newton's first law of motion |
| D. | Newton's second law of motion |
| Answer» B. Conservation of energy | |
| 1912. |
Volume of liquid displaced by a floating body is equivalent to its |
| A. | Own weight |
| B. | Submerged weight |
| C. | Own volume |
| D. | Submerged volume |
| Answer» B. Submerged weight | |
| 1913. |
In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is |
| A. | 0.44 |
| B. | 0.044 |
| C. | 4.4 |
| D. | 44 |
| Answer» B. 0.044 | |
| 1914. |
A differential pressure cell is used for |
| A. | Measuring small pressure difference in gases |
| B. | Measuring small pressure difference in liquids |
| C. | Remote recording of pressure difference |
| D. | Measuring the difference of the impact & the static pressure |
| Answer» D. Measuring the difference of the impact & the static pressure | |
| 1915. |
The ratio of actual discharge to theoretical discharge through an orifice is equal to |
| A. | Cc . Cv |
| B. | Cc . Cd |
| C. | Cv . Cd |
| D. | Cd/Cv |
| Answer» B. Cc . Cd | |
| 1916. |
Which of the following exemplifies a three dimensional fluid flow ? |
| A. | Fluid flow at the inlet to a nozzle |
| B. | Fluid flow between parallel plates |
| C. | Viscous fluid flow between converging plates |
| D. | None of these |
| Answer» B. Fluid flow between parallel plates | |
| 1917. |
The unit of velocity head is |
| A. | ft-lb/sec |
| B. | ft-lb/ft³ |
| C. | ft-lbf/lb |
| D. | ft-lbf/sec |
| Answer» D. ft-lbf/sec | |
| 1918. |
Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the |
| A. | Back flow of fluid in the event of stoppage of pump |
| B. | Discharge pressure |
| C. | Flow of liquid during operation of the pump |
| D. | All of the above |
| Answer» B. Discharge pressure | |
| 1919. |
The Prandtl mixing length is |
| A. | Zero at the pipe wall and is a universal constant |
| B. | Independent of radial distance from the pipe axis |
| C. | Independent of the shear stress |
| D. | Useful for computing laminar flow problems |
| Answer» E. | |
| 1920. |
A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Data insufficient to predict |
| Answer» C. Remain same | |
| 1921. |
The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades. |
| A. | Inlet tip of a blade curves in a direction opposite to that |
| B. | Outlet tip of a blade curves in a direction opposite to that |
| C. | Inlet tip of a blade is towards the direction |
| D. | Outlet tip of a blade is towards the direction |
| Answer» E. | |
| 1922. |
The lift of a ballon is |
| A. | Increased, as it rises to a higher altitude |
| B. | Due to the weight of the atmospheric air, that it displaces |
| C. | Not dependent on the temperature of the atmosphere |
| D. | None of these |
| Answer» C. Not dependent on the temperature of the atmosphere | |
| 1923. |
The friction factor is |
| A. | Always inversely proportional to the Reynolds number |
| B. | Not dimensionless |
| C. | Not dependent on the roughness of the pipe |
| D. | None of these |
| Answer» E. | |
| 1924. |
The centre of pressure is |
| A. | Always below the centroid of the area |
| B. | Always above the centroid of the area |
| C. | A point on the line of action of the resultant force |
| D. | At the centroid of the submerged area |
| Answer» D. At the centroid of the submerged area | |
| 1925. |
A piezometer opening measures the __________ fluid pressure. |
| A. | Static |
| B. | Undisturbed |
| C. | Total |
| D. | Dynamic |
| Answer» C. Total | |
| 1926. |
Terminal velocity is |
| A. | A constant velocity with no acceleration |
| B. | A fluctuating velocity |
| C. | Attained after moving one-half of total distance |
| D. | None of these |
| Answer» B. A fluctuating velocity | |
| 1927. |
Laminar flow is characterised by the nonexistence of |
| A. | Pressure fluctuation |
| B. | Eddies |
| C. | Deviating velocities |
| D. | All of the above |
| Answer» E. | |
| 1928. |
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | Increases linearly |
| Answer» D. Increases linearly | |
| 1929. |
Choose the set of pressure intensities that are equivalent. |
| A. | 4.33 psi, 10 ft. of water, 8.83 inches of Hg |
| B. | 4.33 psi, 10 ft. of water, 20.7 inches of Hg |
| C. | 10 psi, 19.7 ft. of water, 23.3 inches of Hg |
| D. | 10 psi, 19.7 ft. of water, 5.3 inches of Hg |
| Answer» B. 4.33 psi, 10 ft. of water, 20.7 inches of Hg | |
| 1930. |
The temperature in isentropic flow |
| A. | Does not depend on Mach number |
| B. | Depends on Mach number only |
| C. | Cannot drop and then increase again downstream |
| D. | None of these |
| Answer» C. Cannot drop and then increase again downstream | |
| 1931. |
Low specific speed of a pump implies that, it is a/an __________ pump. |
| A. | Axial flow |
| B. | Centrifugal |
| C. | Mixed flow |
| D. | None of these |
| Answer» C. Mixed flow | |
| 1932. |
High specific speed of a pump implies that, it is a/an __________ pump. |
| A. | Centrifugal |
| B. | Mixed flow |
| C. | Axial flow |
| D. | None of these |
| Answer» D. None of these | |
| 1933. |
Specific speed of a centrifugal pump relates it with another pump having the |
| A. | Dynamic similarity |
| B. | Same efficiency |
| C. | Same speed |
| D. | Geometrical similarity |
| Answer» B. Same efficiency | |
| 1934. |
For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of |
| A. | 2 |
| B. | <2 |
| C. | >2 |
| D. | 1/2 |
| Answer» B. <2 | |
| 1935. |
The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe. |
| A. | Hyperbola |
| B. | Parabola |
| C. | Semi-circle |
| D. | Semi-ellipse |
| Answer» C. Semi-circle | |
| 1936. |
Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential. |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 50 |
| Answer» C. 30 | |
| 1937. |
Bernoulli's equation is not applicable, when the flow is |
| A. | Irrotational |
| B. | Incompressible |
| C. | Viscous |
| D. | All of the above |
| Answer» E. | |
| 1938. |
The continuity equation |
| A. | Relates mass flow rate along a stream tube |
| B. | Relates work and energy |
| C. | Stipulates that Newton's second law of motion must be satisfied at every point in the fluid |
| D. | None of these |
| Answer» B. Relates work and energy | |
| 1939. |
Which of the following is not a dimension-less parameter? |
| A. | Euler number |
| B. | Specific gravity |
| C. | Fanning friction factor |
| D. | None of these |
| Answer» E. | |
| 1940. |
The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. |
| A. | 1.8 |
| B. | 12.4 |
| C. | 186.2 |
| D. | 736.4 |
| Answer» C. 186.2 | |
| 1941. |
The simple pitot tube measures the __________ pressure. |
| A. | Static |
| B. | Dynamic |
| C. | Total |
| D. | None of these |
| Answer» D. None of these | |
| 1942. |
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be |
| A. | Δp |
| B. | 2Δp |
| C. | Δp² |
| D. | Δp/2 |
| Answer» C. Δp² | |
| 1943. |
Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone. |
| A. | 1 |
| B. | 10 |
| C. | 40 |
| D. | 70 |
| Answer» C. 40 | |
| 1944. |
Which of the following pipe bends will incur the largest head loss ? |
| A. | U-bend |
| B. | 30° bend |
| C. | 45° bend |
| D. | 90° bend |
| Answer» B. 30° bend | |
| 1945. |
If the head over the triangular notch is doubled, the discharge will increase by __________ times. |
| A. | 2 |
| B. | 2.828 |
| C. | 5.657 |
| D. | 4 |
| Answer» D. 4 | |
| 1946. |
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant? |
| A. | Rotational |
| B. | Unsteady |
| C. | Turbulent |
| D. | Non-uniform |
| Answer» E. | |
| 1947. |
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is |
| A. | 90 |
| B. | 60 |
| C. | 45 |
| D. | 30 |
| Answer» C. 45 | |
| 1948. |
Velocity at a certain point in case of streamline flow is |
| A. | Constant |
| B. | Independent of time |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1949. |
The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid. |
| A. | Dilatant |
| B. | Pseudoplastic |
| C. | Bingham plastic |
| D. | Newtonion |
| Answer» B. Pseudoplastic | |
| 1950. |
The equation given below is called the __________ .f-0.5 = 4.07 loge (NRe√f)-0.6 |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | None of these |
| Answer» C. Fanning equation | |