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.
| 1651. |
N²Re/NFr is called the __________ number. |
| A. | Brinkman |
| B. | Galileo |
| C. | Archimedes |
| D. | Euler |
| Answer» C. Archimedes | |
| 1652. |
The ratio of inertial forces to elastic forces is called the __________ number. |
| A. | Reynolds |
| B. | Mach |
| C. | Euler |
| D. | Weber |
| Answer» C. Euler | |
| 1653. |
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length. |
| A. | Equivalent |
| B. | Transition |
| C. | Prandtl mixing |
| D. | None of these |
| Answer» C. Prandtl mixing | |
| 1654. |
With increase in the shear rate, the apparent viscosity of pseudoplastic fluids |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease; depends on the magnitude of shear rate |
| Answer» C. Remains same | |
| 1655. |
The head loss due to sudden contraction is proportional to |
| A. | Velocity |
| B. | Velocity head |
| C. | Turbulence |
| D. | None of these |
| Answer» C. Turbulence | |
| 1656. |
Upto what value of 'Mach number', a fluid may be considered as incompressible? |
| A. | 0.03 |
| B. | 0.3 |
| C. | 3 |
| D. | 10 |
| Answer» C. 3 | |
| 1657. |
What is the normal range of exit cone angle of a venturimeter? |
| A. | 2 to 5 |
| B. | 7 to 15 |
| C. | 15 to 25 |
| D. | >25 |
| Answer» C. 15 to 25 | |
| 1658. |
The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is |
| A. | 1.3 |
| B. | 0.766 |
| C. | 0.87 |
| D. | None of these |
| Answer» C. 0.87 | |
| 1659. |
Cocks are used to control |
| A. | Water |
| B. | Any liquid |
| C. | Solids |
| D. | None of these |
| Answer» C. Solids | |
| 1660. |
The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 0.33 |
| Answer» D. 0.33 | |
| 1661. |
Centrifugal pump is normally classified on the basis of the |
| A. | Rpm |
| B. | Type of casing |
| C. | Impeller blade angle |
| D. | Number of blades in impeller |
| Answer» C. Impeller blade angle | |
| 1662. |
Experimental study of laminar fluid flow through a circular tube was conducted by |
| A. | Reynolds |
| B. | Hagen and Poiseuille |
| C. | Pascal |
| D. | Blake-Plummer |
| Answer» C. Pascal | |
| 1663. |
Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its |
| A. | Inner diameter |
| B. | Outer diameter |
| C. | Thickness |
| D. | Neither inner nor outer diameter |
| Answer» E. | |
| 1664. |
Check valves are used |
| A. | At high pressure |
| B. | In bends |
| C. | For controlling water flow |
| D. | For unidirectional flow |
| Answer» E. | |
| 1665. |
Check in a centrifugal pump is |
| A. | Provided in the discharge line |
| B. | Generally a globe valve |
| C. | Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running |
| D. | All of the above |
| Answer» E. | |
| 1666. |
Erosion and pits formation on the impeller of a centrifugal pump may be due to |
| A. | Cavitation |
| B. | Low speed of impeller |
| C. | Its operation with delivery valve closed for considerable time after starting the pump |
| D. | Off centering of pump with motor |
| Answer» B. Low speed of impeller | |
| 1667. |
In case of venturimeters, friction losses are about __________ percent of maximum velocity head. |
| A. | 2 |
| B. | 8 |
| C. | 12 |
| D. | 20 |
| Answer» B. 8 | |
| 1668. |
The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is |
| A. | 0.1 |
| B. | 0.5 |
| C. | 0.94 |
| D. | 1 |
| Answer» C. 0.94 | |
| 1669. |
Cavitation can be prevented by |
| A. | Suitably designing the pump |
| B. | Maintaining the suction head sufficiently greater than the vapour pressure |
| C. | Maintaining suction head = developed head |
| D. | Maintaining suction head lower than the vapour pressure |
| Answer» C. Maintaining suction head = developed head | |
| 1670. |
Choking in case of pipe flow means that a |
| A. | Specified mass flow rate can not be achieved |
| B. | Valve is closed in the line |
| C. | Restriction in flow cross-section area occurs |
| D. | None of these |
| Answer» B. Valve is closed in the line | |
| 1671. |
Which of the following can be used to create a flow of gas, where no significant compression is required? |
| A. | Reciprocating compressor |
| B. | Blower |
| C. | Axial flow compressor |
| D. | Centrifugal compressor |
| Answer» C. Axial flow compressor | |
| 1672. |
Actual lift of a pump is always less than the theoretical lift and is limited by the |
| A. | Specific gravity & temperature of the liquid |
| B. | Leakage & pressure decreasing at higher elevations |
| C. | Frictional resistance through pipes, fittings & passages |
| D. | All of the above |
| Answer» E. | |
| 1673. |
An isentropic process is the one, in which |
| A. | pv = constant |
| B. | pvr = constant |
| C. | pvr = constant, and process is reversible |
| D. | None of these |
| Answer» D. None of these | |
| 1674. |
Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe. |
| A. | Diameter |
| B. | Colour |
| C. | Altitude |
| D. | None of these |
| Answer» C. Altitude | |
| 1675. |
In a dry packed bed, the pressure drop will be changed by increasing the flow rate as |
| A. | V1.8 |
| B. | V-0.8 |
| C. | V |
| D. | V-1 |
| Answer» B. V-0.8 | |
| 1676. |
The line of action of the buoyant force acts through the |
| A. | Centroid of the displaced volume of fluid |
| B. | Centre of gravity of a submerged body |
| C. | Centroid of the volume of any floating body |
| D. | None of these |
| Answer» B. Centre of gravity of a submerged body | |
| 1677. |
Buoyant force |
| A. | For non-symmetrical bodies is not vertical |
| B. | Depends on the depth of the submergence of the floating body |
| C. | Depends on the weight of the floating body |
| D. | None of these |
| Answer» D. None of these | |
| 1678. |
Boundary layer exists in flow |
| A. | Of real fluids |
| B. | Over flat surfaces only |
| C. | In pipes only |
| D. | Of ideal fluids only |
| Answer» B. Over flat surfaces only | |
| 1679. |
Fanning equation is given by ∆p/ρ = 4f. L/D . v²/2gc . It is applicable to __________ region flow. |
| A. | Transition |
| B. | Laminar |
| C. | Turbulent |
| D. | Both B and C |
| Answer» E. | |
| 1680. |
A globe valve is the most suitable for applications, in which |
| A. | Fluid flow control is required |
| B. | Fluid contains dispersed solid particles |
| C. | Valve is required to be either fully open or fully closed |
| D. | One way flow is required |
| Answer» B. Fluid contains dispersed solid particles | |
| 1681. |
Pascal law is not applicable for a/an __________ fluid. |
| A. | Accelerating frictionless |
| B. | Static |
| C. | Uniformly moving |
| D. | None of these |
| Answer» E. | |
| 1682. |
What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides change? |
| A. | Rotation |
| B. | Translation |
| C. | Linear deformation |
| D. | Angular deformation |
| Answer» E. | |
| 1683. |
The Reynolds number for an ideal fluid flow is |
| A. | 4 |
| B. | 2100-4000 |
| C. | 4000 |
| D. | ∞ |
| Answer» E. | |
| 1684. |
The buoyant force acting on a floating body is dependent on the |
| A. | Viscosity of the liquid |
| B. | Weight of the liquid displaced |
| C. | Depth of immersion of the body |
| D. | Surface tension of the liquid |
| Answer» C. Depth of immersion of the body | |
| 1685. |
Euler's equation of motion states, that at every point, the |
| A. | Fluid momentum is constant |
| B. | Force per unit mass equals acceleration |
| C. | Rate of mass outflow is equal to the rate of mass inflow |
| D. | None of these |
| Answer» C. Rate of mass outflow is equal to the rate of mass inflow | |
| 1686. |
The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the |
| A. | Barometric pressure |
| B. | Speed of the impeller |
| C. | Diameter of the impeller |
| D. | Both B and C |
| Answer» B. Speed of the impeller | |
| 1687. |
Viscosity of water is about __________ times that of air at room temperature. |
| A. | 15 |
| B. | 55 |
| C. | 155 |
| D. | 1050 |
| Answer» C. 155 | |
| 1688. |
At low Reynolds number |
| A. | Viscous forces are unimportant |
| B. | Viscous forces control |
| C. | Viscous forces control and inertial forces are unimportant |
| D. | Gravity forces control |
| Answer» D. Gravity forces control | |
| 1689. |
The capacity of a centrifugal pump Can be increased by increasing the |
| A. | Impeller diameter or speed |
| B. | Number of pumps and joining them in series |
| C. | Number of pumps and joining them in parallel |
| D. | All of the above |
| Answer» E. | |
| 1690. |
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)? |
| A. | ε = ε0 + α.t |
| B. | ε = ε0 + α.t² |
| C. | ε = ε0 + α.t³ |
| D. | ε = ε0 + α.t⁴ |
| Answer» B. ε = ε0 + α.t² | |
| 1691. |
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm². |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 1692. |
It is possible to integrate an automatic flow controller to a |
| A. | Flow nozzle |
| B. | Venturimeter |
| C. | Rotameter |
| D. | None of these |
| Answer» D. None of these | |
| 1693. |
A hydraulic accumulator comprises of |
| A. | A storage device and a control valve |
| B. | A cylinder and a plunger |
| C. | Two pistons and two cylinders |
| D. | A storage tank and a ram pump |
| Answer» C. Two pistons and two cylinders | |
| 1694. |
At high Reynolds number |
| A. | Inertial forces control and viscous forces are unimportant |
| B. | Viscous forces predominate |
| C. | Inertial forces are unimportant and viscous forces control |
| D. | None of these |
| Answer» B. Viscous forces predominate | |
| 1695. |
Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft. |
| A. | 40 |
| B. | 34 |
| C. | 8 |
| D. | 37 |
| Answer» D. 37 | |
| 1696. |
Manometers measure the __________ pressure. |
| A. | Vacuum as well as the atmospheric |
| B. | Difference in |
| C. | Absolute |
| D. | Gage |
| Answer» C. Absolute | |
| 1697. |
The pitot static tube does not measure the __________ pressure. |
| A. | Static |
| B. | Total |
| C. | Difference in static & dynamic |
| D. | All of the above |
| Answer» E. | |
| 1698. |
The capillary rise of mercury is maximum in glass tube of dia __________ mm. |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 5 |
| Answer» B. 1 | |
| 1699. |
Capacity of a rotary gear pump can be varied by |
| A. | Changing the speed of rotation |
| B. | Bleeding air into suction |
| C. | Bypassing liquid from the suction or discharge line |
| D. | All of the above |
| Answer» E. | |
| 1700. |
In case of coutte flow, the fluid flow is between two large flat parallel plates with |
| A. | Top plate moving and the bottom plate fixed |
| B. | Bottom plate moving and the top plate fixed |
| C. | Both the plates fixed |
| D. | Both the plates moving |
| Answer» B. Bottom plate moving and the top plate fixed | |