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.
| 951. |
What causes convective acceleration in fluid flow ? |
| A. | Steep slope in flow |
| B. | Unsteady nature of flow |
| C. | Non-uniformity of flow |
| D. | Turbulence in flow |
| Answer» D. Turbulence in flow | |
| 952. |
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 | |
| 953. |
Which of the following flow measuring devices is an area meter ? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Anemometer |
| D. | Rotameter |
| Answer» E. | |
| 954. |
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 | |
| 955. |
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 | |
| 956. |
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary. |
| A. | I, II, III |
| B. | II, III, V |
| C. | I, II, V |
| D. | II, IV, V |
| Answer» C. I, II, V | |
| 957. |
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. | |
| 958. |
Cp/Cv is termed as |
| A. | adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 959. |
Boundary layer thickness in laminar flow over a flat plate increases as (where, d = distance from the leading edge.) |
| A. | √d |
| B. | d^1/3 |
| C. | d² |
| D. | d^2/3 |
| Answer» B. d^1/3 | |
| 960. |
Which is the most efficient and best for measuring very small flow rate of gases ? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Rotameter |
| D. | Flow nozzle |
| Answer» D. Flow nozzle | |
| 961. |
For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as |
| A. | d |
| B. | d² |
| C. | d⁴ |
| D. | d²̅ |
| Answer» E. | |
| 962. |
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 | |
| 963. |
Which of the following is dimensionless ? |
| A. | Angular velocity |
| B. | Fanning friction factor |
| C. | Specific volume |
| D. | None of these |
| Answer» C. Specific volume | |
| 964. |
For the free settling of a spherical particle through a fluid, the slope of, Cᴅ-log Nʀₑ , plot is |
| A. | 1 |
| B. | -1 |
| C. | 0.5 |
| D. | -0.5 |
| Answer» C. 0.5 | |
| 965. |
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' | |
| 966. |
Pick out the Hagen-Poiseulle's equation. |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 967. |
During fluid flow, variation of shear stress(τ) with velocity gradientat (dv/dy) constant pressure temperature is shown below in the figure. In the below figure, Binghom plastic is represented by the curve . |
| A. | V |
| B. | II |
| C. | III |
| D. | I |
| Answer» C. III | |
| 968. |
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. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 969. |
Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively |
| A. | efficiency, head and B.H.P. |
| B. | head, efficiency and B.H.P. |
| C. | B.H.P., efficiency and head |
| D. | efficiency, B.H.P. and head |
| Answer» C. B.H.P., efficiency and head | |
| 970. |
For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be |
| A. | V₁ < V₂ < V₃ |
| B. | V₂ > V₁ and V₂ > V₃ |
| C. | V₁ > V₂ > V₃ |
| D. | none of these. |
| Answer» C. V₁ > V₂ > V₃ | |
| 971. |
Pick out the Kozney-Karman equation (valid for low Nʀₑ) for fluid flow through a packed bed of solids. |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 972. |
For the manometer set up shown in the figure, the pressure difference Pᴀ - Pʙ is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 973. |
Drag co-officient Cᴅ, in Stoke's law range is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 974. |
In frictional fluid flow, the following quantity 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. | |
| 975. |
Pressure drop for turbulent fluid flow through a circular pipe is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 976. |
In power law, consider the following equation, then the fluid is |
| A. | Newtonian |
| B. | dilatant |
| C. | thixotropic |
| D. | rheopectic |
| Answer» B. dilatant | |
| 977. |
The head loss due to sudden expansion is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 978. |
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 | |
| 979. |
Fanning equation is given by below equation. It is applicable to __________ region flow. |
| A. | transition |
| B. | laminar |
| C. | turbulent |
| D. | both (b) and (c) |
| Answer» E. | |
| 980. |
For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are |
| A. | h₁ > h₂ < h₃ |
| B. | h₁ > h₂ > h₃ |
| C. | h₂ < h₁ < h₃ |
| D. | h₁ < h₂ < h₃ |
| Answer» B. h₁ > h₂ > h₃ | |
| 981. |
The Kozney-Carman equation, rewritten in terms of non-dimensional numbers gives (ΔP/pu² ) proportional to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 982. |
Which of the following assumptions enables the Euler's equation of motion to be integrated ? |
| A. | The fluid is incompressible. |
| B. | The fluid is non-viscous. |
| C. | The continuity equation is satisfied. |
| D. | The flow is rotational and incompressible. |
| Answer» B. The fluid is non-viscous. | |
| 983. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10³ Vₒₘ + 10.94 x 10⁶ V² ₒₘ (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, Vₒₘ is |
| A. | 12 mm/s |
| B. | 16 mm/s |
| C. | 24 mm/s |
| D. | 28 mm/s |
| Answer» C. 24 mm/s | |
| 984. |
Cd is always __________ Cc. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| D. | either more or less than |
| Answer» B. less than | |
| 985. |
Pressure drop for laminar fluid flow through a circular pipe is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 986. |
A free jet of water of cross-sectional area 0.01 m² and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is |
| A. | 200 N |
| B. | 400 N |
| C. | 2000 N |
| D. | 4000 N |
| Answer» E. | |
| 987. |
A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V₀. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)², what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction. |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 988. |
The valve used for very remote and accurate control of fluid is a __________ valve. |
| A. | needle |
| B. | globe |
| C. | gate |
| D. | butterfly |
| Answer» B. globe | |
| 989. |
For a given fluid flow rate, which of the following incurs maximum head loss ? |
| A. | Orifice meter |
| B. | Venturimeter |
| C. | Flow nozzle |
| D. | All of them incur the same head loss |
| Answer» B. Venturimeter | |
| 990. |
Which of the following is not a dimension-less parameter ? |
| A. | Pressure-co-efficient |
| B. | Froude number |
| C. | Kinematic viscosity |
| D. | Weber number |
| Answer» D. Weber number | |
| 991. |
Cd, C and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficientCc = co-efficient of contraction = area of jet at vena-contracta / area of openingCv = co-efficient of velocity = actual velocity at vena-contracta / Theoretical velocity ) |
| A. | Cd = Cc/Cv |
| B. | Cd = Cc.Cv |
| C. | Cd = Cv/Cc |
| D. | none of these |
| Answer» C. Cd = Cv/Cc | |
| 992. |
Which of the following may be termed as a variable orifice flowmeter ? |
| A. | Rotameter |
| B. | Pitot tube |
| C. | V-notch |
| D. | All (a), (b) and (c) |
| Answer» B. Pitot tube | |
| 993. |
What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ? |
| A. | 0.64 |
| B. | 1.65 |
| C. | 0.32 |
| D. | 0.94 |
| Answer» B. 1.65 | |
| 994. |
What is the speed of sound (m/sec) in ordinary water ? |
| A. | 1500 |
| B. | 330 |
| C. | 1000 |
| D. | 3000 |
| Answer» B. 330 | |
| 995. |
Which of the following denotes the effect of compressibility in fluid flow ? |
| A. | Weber number |
| B. | Mach number |
| C. | Euler number |
| D. | Reynolds number |
| Answer» C. Euler number | |
| 996. |
Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about |
| A. | 0.42 |
| B. | 0.62 |
| C. | 0.82 |
| D. | 0.98 |
| Answer» C. 0.82 | |
| 997. |
Pick out the Blake-Plummer equation (valid for large Nʀₑ) for fluid flow through beds of solids. |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 998. |
Curve III in the below diagram represents a/an |
| A. | dilatent fluid |
| B. | pseudo plastic fluid |
| C. | ideal plastic |
| D. | none of these |
| Answer» C. ideal plastic | |
| 999. |
Colebrook equation for friction factor in turbulent flow is given by following equation. It reduces to Nikuradse equation for a value of ε/D equal to |
| A. | 0 |
| B. | 1 |
| C. | ∞ |
| D. | 0.5 |
| Answer» C. ∞ | |
| 1000. |
The terminal velocity of a particle moving through a fluid varies as dₚⁿ. What is the value of 'n' for Newton's law regime ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 3 |
| Answer» B. 1 | |