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.
| 1751. |
f = 16/NRe, is valid for |
| A. | Turbulent flow |
| B. | Laminar flow through an open channel |
| C. | Steady flow |
| D. | None of these |
| Answer» E. | |
| 1752. |
Various efficiencies of a centrifugal pump are related as (where, ηm = mechanical efficiency ηv = volumetric efficiency. ηma = manometric efficiency ηo = overall efficiency) |
| A. | ηma x ηm x ηv = ηo |
| B. | ηm = ηv . ηma |
| C. | ηma = ηm x ηv |
| D. | ηv = ηm x ηma |
| Answer» C. ηma = ηm x ηv | |
| 1753. |
For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is |
| A. | 1 |
| B. | -1 |
| C. | 0.5 |
| D. | -0.5 |
| Answer» C. 0.5 | |
| 1754. |
Fanning friction factor is equal to(where, fB = Blassius friction factor). |
| A. | fB/4 |
| B. | fB/2 |
| C. | 4fB |
| D. | 2fB |
| Answer» B. fB/2 | |
| 1755. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) |
| A. | 1/√M |
| B. | √M |
| C. | 1/M |
| D. | M |
| Answer» B. √M | |
| 1756. |
Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. |
| A. | Elastic |
| B. | Viscous |
| C. | Gravity |
| D. | None of these |
| Answer» B. Viscous | |
| 1757. |
What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10⁶ approximately? |
| A. | 0.003 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 0.3 |
| Answer» B. 0.01 | |
| 1758. |
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation |
| A. | dq/dx = K |
| B. | dq/dx = K.q |
| C. | dq/dx = K/q |
| D. | dq/dx = Kq² |
| Answer» B. dq/dx = K.q | |
| 1759. |
The capacity of an accumulator is the maximum |
| A. | Energy which it can store |
| B. | Discharge which it can deliver |
| C. | Liquid which it can store |
| D. | None of these |
| Answer» B. Discharge which it can deliver | |
| 1760. |
A hydraulic ram acts as a/an __________ pump. |
| A. | Centrifugal |
| B. | Reciprocating |
| C. | Impulse |
| D. | Parallel cylinder |
| Answer» D. Parallel cylinder | |
| 1761. |
Curve III in the above diagram represents a/an |
| A. | Dilatent fluid |
| B. | Pseudo plastic fluid |
| C. | Ideal plastic |
| D. | None of these |
| Answer» C. Ideal plastic | |
| 1762. |
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor. |
| A. | Brings about no further reduction of |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 1763. |
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity. |
| A. | Directly proportional to |
| B. | Inversely proportional to |
| C. | Inversely proportional to the square root of |
| D. | Independent of |
| Answer» C. Inversely proportional to the square root of | |
| 1764. |
Navier-Stokes equation is useful in the analysis of __________ fluid flow problems. |
| A. | Non-viscous |
| B. | Viscous |
| C. | Turbulent |
| D. | Rotational |
| Answer» C. Turbulent | |
| 1765. |
At a constant speed of the centrifugal pump . it __________ the impeller diameter. |
| A. | Capacity varies directly with |
| B. | Head varies as the square of |
| C. | Horsepower varies as the cube of |
| D. | All of the above |
| Answer» E. | |
| 1766. |
The curve of metacentre for a floating body __________ the curve of buoyancy. |
| A. | Is always below |
| B. | Is the evolute of |
| C. | Intersects at right angle |
| D. | Is tangential to |
| Answer» C. Intersects at right angle | |
| 1767. |
Centre of pressure in an immersed body is __________ the centre of gravity. |
| A. | Above |
| B. | Below |
| C. | At |
| D. | Either above or below; depends on the liquid density |
| Answer» C. At | |
| 1768. |
Drag co-efficient in hindered settling is __________ that in free settling. |
| A. | Less than |
| B. | Equal to |
| C. | Not necessarily greater than |
| D. | Always greater than |
| Answer» E. | |
| 1769. |
For the production of very high vacuum, a __________ pump is normally used. |
| A. | Diffusion |
| B. | Centrifugal |
| C. | Jet ejector |
| D. | Piston |
| Answer» B. Centrifugal | |
| 1770. |
The terminal velocity of a particle moving through a fluid varies as dpn. The value of n is equal to __________ in Stoke's law regime. |
| A. | 1 |
| B. | 0.5 |
| C. | 2 |
| D. | 1.5 |
| Answer» D. 1.5 | |
| 1771. |
Power loss in an orificemeter is __________ that in a venturimeter. |
| A. | Less than |
| B. | Same as |
| C. | More than |
| D. | Data insufficient, cannot be predicted |
| Answer» D. Data insufficient, cannot be predicted | |
| 1772. |
The uniformity of a gas fluidised bed depends upon the __________ of the solid particles. |
| A. | Size |
| B. | Surface properties |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 1773. |
Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter. |
| A. | 0.5 |
| B. | 5 |
| C. | 50 |
| D. | 100 |
| Answer» D. 100 | |
| 1774. |
The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter. |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.66 |
| D. | 0.95 |
| Answer» E. | |
| 1775. |
Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter. |
| A. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 1776. |
The exit cone angle in case of a standard venturimeter is __________ the entrance cone angle. |
| A. | Smaller than |
| B. | Greater than |
| C. | Equal to |
| D. | Either A or B |
| Answer» B. Greater than | |
| 1777. |
Bernoulli's equation for steady, frictionless, continuous flow states that the __________ at all sections is same. |
| A. | Total pressure |
| B. | Total energy |
| C. | Velocity head |
| D. | None of these |
| Answer» C. Velocity head | |
| 1778. |
In isotropic turbulence, the __________ are equal to each other. |
| A. | Temporal velocity components |
| B. | Mean square of velocity fluctuations in the three co-ordinate directions |
| C. | Root mean square of velocity fluctuations in the three co-ordinate directions |
| D. | None of these |
| Answer» C. Root mean square of velocity fluctuations in the three co-ordinate directions | |
| 1779. |
Viscosity of a liquid decreases __________ with rise in temperature. |
| A. | Exponentially |
| B. | Linearly |
| C. | Logarithmically |
| D. | None of these |
| Answer» D. None of these | |
| 1780. |
A pitched-blade turbine draws __________ a straight blade turbine. |
| A. | Less power than |
| B. | More power than |
| C. | Same power as |
| D. | Data insufficient to predict |
| Answer» B. More power than | |
| 1781. |
The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is _________ the mean velocity of flow. |
| A. | Directly proportional to |
| B. | Directly proportional to square of |
| C. | Inversely proportional to |
| D. | Inversely proportional to square of |
| Answer» C. Inversely proportional to | |
| 1782. |
Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure. |
| A. | Increase |
| B. | Decrease |
| C. | Not change |
| D. | Exponentially decrease |
| Answer» B. Decrease | |
| 1783. |
__________ pumps are axial flow pumps. |
| A. | Turbine |
| B. | Propeller |
| C. | Diffuser |
| D. | None of these |
| Answer» C. Diffuser | |
| 1784. |
Sewage sludge is __________ type of non-Newtonion fluid. |
| A. | Dilatant |
| B. | Bingham plastic |
| C. | Pseudo plastic |
| D. | None of these |
| Answer» C. Pseudo plastic | |
| 1785. |
For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is |
| A. | 1 |
| B. | 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |
| 1786. |
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ?1. Fluid flow is frictionless & irrotational.2. Fluid flow is steady.3. Fluid flow is uniform & turbulent.4. Fluid is compressible.5. Fluid is incompressible. |
| A. | 1, 3, 3 |
| B. | 2, 3, 4 |
| C. | 1, 2, 4 |
| D. | 1, 3, 4 |
| Answer» D. 1, 3, 4 | |
| 1787. |
When the momentum of one fluid is used for moving another fluid, such a device is called a/an |
| A. | Jet pump |
| B. | Blower |
| C. | Acid egg |
| D. | None of these |
| Answer» B. Blower | |
| 1788. |
In fluid flow, cavitation is caused, if the |
| A. | Fluid velocity decreases to zero |
| B. | Total energy decreases |
| C. | Both A and B |
| D. | Flow pressure approaches its vapor pressure at the prevailing temperature |
| Answer» E. | |
| 1789. |
Dimension of surface tension is(where, F = force, L = length) |
| A. | FL⁻¹ |
| B. | F⁻¹ . L |
| C. | F.L⁻² |
| D. | F⁻² . L |
| Answer» B. F⁻¹ . L | |
| 1790. |
A rectangular surface 3' x 4', has the lower 3 edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is(where, y = specific weight of water) |
| A. | 39.6y |
| B. | 48y |
| C. | 49.2y |
| D. | 58y |
| Answer» C. 49.2y | |
| 1791. |
A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity |
| A. | Same as that of A |
| B. | One fourth as that of A |
| C. | Twice as that of A |
| D. | Four times as that of A |
| Answer» C. Twice as that of A | |
| 1792. |
In fluid flow, the stagnation point is defined as a point, where the __________ is zero. |
| A. | Flow velocity |
| B. | Pressure |
| C. | Total energy |
| D. | All of the above |
| Answer» B. Pressure | |
| 1793. |
The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and |
| A. | Moving |
| B. | Static |
| C. | Cold |
| D. | Hot |
| Answer» B. Static | |
| 1794. |
Two piping system are said to be equivalent, when the __________ are same. |
| A. | Fluid flow rate & friction loss |
| B. | Length & friction factor |
| C. | Diameter & friction factor |
| D. | Length & diameter |
| Answer» B. Length & friction factor | |
| 1795. |
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f₁. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | Increase or decrease depending on the pipe material |
| Answer» B. Decrease | |
| 1796. |
Pascal's law is valid, only when the fluid is |
| A. | Frictionless and at rest |
| B. | At rest |
| C. | At rest and when the frictionless fluid is in motion |
| D. | None of these |
| Answer» C. At rest and when the frictionless fluid is in motion | |
| 1797. |
Most commonly used joint in the underground pipe lines is the |
| A. | Sleevejoint |
| B. | Coupling |
| C. | Flange |
| D. | Expansion joint |
| Answer» B. Coupling | |
| 1798. |
Fanning friction factor equation applies to the __________ fluid flow. |
| A. | Non-isothermal condition of |
| B. | Compressible |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» E. | |
| 1799. |
Which of the following is most prone to pulsating discharge flow ? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Gear pump |
| D. | Axial flow pump |
| Answer» D. Axial flow pump | |
| 1800. |
A bed consists of particles of density 2000 kg/m³. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is |
| A. | 25.61 kPa |
| B. | 11.77 kPa |
| C. | 14.86 kPa |
| D. | 21.13 kPa |
| Answer» C. 14.86 kPa | |