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.
| 51. |
A floating body is in stable equilibrium when |
| A. | The metacentre is below its centre of gravity |
| B. | The metacentre is above its centre of gravity |
| C. | The metacentric height is zero. |
| D. | Its centre of gravity is below the centre of buoyancy. |
| Answer» C. The metacentric height is zero. | |
| 52. |
Which of the following statements pertaining to a centrifugal pump is incorrect? |
| A. | The suction lift of a pump can be upto 10·3 m or even more. |
| B. | The impellers of a multi-stage pump are arranged in parallel to discharge a large quantity of liquid. |
| C. | The volute casing of the pump maintains the velocity of flow constant, prevents eddies and converts velocity head to pressure he |
| Answer» B. The impellers of a multi-stage pump are arranged in parallel to discharge a large quantity of liquid. | |
| 53. |
In which of the following methods of dimensional analysis, a functional relationship of some variables is expressed in the form of an exponential equation, which must be dimensionally homogeneous? |
| A. | Buckingham’s π-method |
| B. | Rayleigh’s method |
| C. | Bridgman’s method |
| D. | Matrix–tensor method. |
| Answer» C. Bridgman’s method | |
| 54. |
Cavitation damage in turbine runner occurs near the |
| A. | Inlet on the convex side of blades |
| B. | Outlet on the convex side of blades |
| C. | Inlet on the concave side of blades |
| D. | Outlet on the concave side of blades. |
| Answer» C. Inlet on the concave side of blades | |
| 55. |
For viscous flow the co-efficient of friction is given by |
| A. | f = 8/Re |
| B. | f = 16/Re |
| C. | f = 32/Re |
| D. | f = 60/Re. |
| Answer» C. f = 32/Re | |
| 56. |
Metacentric height can be determined by |
| A. | Only analytical method |
| B. | Only experimental method |
| C. | Both (a) and (b) |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 57. |
The point of application of the force of buoyancy on the body is known as |
| A. | Centre of gravity |
| B. | Centre of buoyancy |
| C. | Metacenter |
| D. | None of the above. |
| Answer» C. Metacenter | |
| 58. |
…... studied the laminar flow through a circular tube experimentally |
| A. | Prandtl |
| B. | Pascal |
| C. | Hagen and Poiseuille |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 59. |
Which of the following statements is correct for a reaction turbine? |
| A. | The outlet must be above the tail race. |
| B. | Water may be allowed to enter a part or whole of wheel circumference. |
| C. | Flow can be regulated without loss. |
| D. | There is only partial conversion of available head to velocity head before entry to rotor. |
| Answer» E. | |
| 60. |
With respect to a Kaplan turbine which of the following statements is incorrect? |
| A. | It employs large guide vane angles than is the case for a Francis turbine. |
| B. | It is designed for flow velocity of mixed flow type. |
| C. | It has blades of small camber to prevent separation. |
| D. | It can adjust both guide vane and blade angles according to rate of discharge. |
| Answer» C. It has blades of small camber to prevent separation. | |
| 61. |
In dimensional analysis the Buckingham’s π–theorem is widely used and expresses the resulting equation in terms of |
| A. | The repeating variables |
| B. | Geometric, kinematic and dynamic variables |
| C. | (n – m) dimensionless parameters |
| D. | n dimensionless parameters. |
| Answer» D. n dimensionless parameters. | |
| 62. |
For maximum efficiency of a series of curved vanes, the speed is |
| A. | Equal to the jet speed |
| B. | 3/4 of the jet speed |
| C. | 1/2 of the jet speed |
| D. | 1/3 of the jet speed. |
| Answer» D. 1/3 of the jet speed. | |
| 63. |
Which of the following is not a dimensionless parameter? |
| A. | Friction factor |
| B. | Specific speed |
| C. | Thoma’s cavitation parameter |
| D. | Pressure co-efficient. |
| Answer» C. Thoma’s cavitation parameter | |
| 64. |
The total-energy-line in pipe flow is a graphical representation of the Bernoulli’s equation and representsthe sum of velocity head, pressure head and the elevation head above: |
| A. | The top of the pipeline |
| B. | The arbitrary horizontal datum |
| C. | The centre line of pipe |
| D. | The bottom of the pipe. |
| Answer» C. The centre line of pipe | |
| 65. |
The intensity of pressure p is related to specific weight w of the liquid and vertical depth h of the pointby the equation |
| A. | p = wh |
| B. | h = pw |
| C. | p = wh2 |
| D. | p = wh3. |
| Answer» B. h = pw | |
| 66. |
In centrifugal pumps, cavitation is reduced by |
| A. | Increasing the flow velocity |
| B. | Reducing the discharge |
| C. | Throttling the discharge |
| D. | Reducing the suction head. |
| Answer» E. | |
| 67. |
Which of the following devices is used for transmitting increased or decreased torque from one shaft toanother? |
| A. | Hydraulic ram |
| B. | Hydraulic coupling |
| C. | Hydraulic intensifier |
| D. | Hydraulic torque converter |
| Answer» E. | |
| 68. |
..... is a device with which small quantities of water can be pumped to higher levels from the available large quantity of water of low head. |
| A. | Hydraulic accumulator |
| B. | Hydraulic intensifier |
| C. | Hydraulic ram |
| D. | Air lift pump. |
| Answer» D. Air lift pump. | |
| 69. |
A venturimeter is used for measuring: |
| A. | Pressure |
| B. | Flow rate |
| C. | Total energy |
| D. | Piezometric head. |
| Answer» C. Total energy | |
| 70. |
Specific speed of an impulse turbine (Pelton wheel) ranges from |
| A. | 12 to 70 |
| B. | 80 to 400 |
| C. | 300 to 1000 |
| D. | 1000 to 1200. |
| Answer» B. 80 to 400 | |
| 71. |
In flow through pipe bends the pressures on inner and out radii |
| A. | Stand at the same level increasing gradually towards the pipe center. |
| B. | Vary, it being more on the inner core. |
| C. | Are different, pressure increases with increase in radius and is, therefore, more at the outer radius. |
| D. | Do not vary and are the same as at the center of the pipe. |
| Answer» E. | |
| 72. |
In a centrifugal pump the sum of suction head and delivery head is known as |
| A. | Monomeric head |
| B. | Total head |
| C. | Static head |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 73. |
“When a body is immersed in a fluid either wholly or partially, it is buoyed or lifted up by a force which is equal to the weight of fluid displaced by the body”. This principle was enunciated by |
| A. | Archimedes |
| B. | Newton |
| C. | Pascal |
| D. | Kirchhoff. |
| Answer» B. Newton | |
| 74. |
In a fluid-flow the stream lines are lines |
| A. | Along which the vorticity is zero |
| B. | Along which the stream function ψ = constant |
| C. | Which are parallel to the equipotential lines |
| D. | Which exist in irrotional flow only. |
| Answer» C. Which are parallel to the equipotential lines | |
| 75. |
The difference between the power obtained from the turbine shaft and power supplied by water at its entry to the turbine is equal to |
| A. | Sum of hydraulic and mechanical losses |
| B. | Sum of mechanical and volumetric losses |
| C. | Mechanical losses |
| D. | Hydraulic losses. |
| Answer» B. Sum of mechanical and volumetric losses | |
| 76. |
Commercial cast-iron and steel pipes carrying fluids under pressure are regarded as hydraulically smooth when |
| A. | The laminar layer is thin as compared to the average height of roughness elements |
| B. | The height of the roughness projections is low |
| C. | The roughness elements are all completely covered by the laminar sublayer |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 77. |
The piezometric head is the summation of : |
| A. | Velocity head and pressure head |
| B. | Pressure head and elevation head |
| C. | Velocity head and elevation head |
| D. | None of the above. |
| Answer» C. Velocity head and elevation head | |
| 78. |
The flow in town water supply pipes is generally |
| A. | Laminar |
| B. | Turbulent |
| C. | Transition |
| D. | Any of the above. |
| Answer» C. Transition | |
| 79. |
Mach’s number is defined as the square root of the ratio of the |
| A. | Inertia force to the pressure force |
| B. | Inertia force to the surface tension force |
| C. | Inertia force to the elastic force |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 80. |
In a centrifugal pump the regulating valve is provided on |
| A. | The suction pipe |
| B. | Delivery pipe |
| C. | The casing |
| D. | None of the above. |
| Answer» C. The casing | |
| 81. |
Kinematic similarity between model and prototype is the |
| A. | Similarity of discharge |
| B. | Similarity of shape |
| C. | Similarity of streamline pattern |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 82. |
In an outward radial flow turbine energy conversion process is |
| A. | Purely by reaction only |
| B. | Purely by impulse only |
| C. | Partly by impulse and partly by reaction |
| D. | None of the above. |
| Answer» E. | |
| 83. |
If A is the area of the immersed surface, w is the specific weight of the liquid and ͞x is the depth ofhorizontal surface from the liquid surface, then the total pressure P on the surface is given by |
| A. | p = wA2 ͞x |
| B. | p = w2A ͞x |
| C. | p = wA ͞x |
| D. | p = wA ͞x2 |
| Answer» D. p = wA ͞x2 | |
| 84. |
.... is a device which is employed for transmission of power from one shaft to another through a liquid medium. |
| A. | Hydraulic intensifier |
| B. | Hydraulic torque converter |
| C. | Hydraulic coupling |
| D. | Hydraulic press |
| Answer» D. Hydraulic press | |
| 85. |
The head developed by a centrifugal pump may be expressed as |
| A. | H = (Vw2 u2 + Vw1 u2)/g |
| B. | H = Vw2 u2 /g |
| C. | H = Vw1 u1 /g |
| D. | None of the above. |
| Answer» C. H = Vw1 u1 /g | |
| 86. |
In fluid mechanics, the continuity equation is a mathematical statement embodying the principle of |
| A. | Conservation of momentum |
| B. | Conservation of mass |
| C. | Conservation of energy |
| D. | None of the above. |
| Answer» C. Conservation of energy | |
| 87. |
To apply Buckingham’s π–theorem, m repeating variables are selected from amongst the n variables influencing the phenomenon. The repeating variables are selected such that they |
| A. | Belong to kinematic and dynamic category of variables |
| B. | Must always contain the dependent variables |
| C. | In combination contain each of the m fundamental dimensions involved in the problem. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 88. |
Euler’s equation (in differential form) is written as: |
| A. | dp/ρ + v2.dv + g.dz = 0 |
| B. | dp/ρ + v.dv + g.dz = 0 |
| C. | dp/ρ + v.dv + g2.dz = 0 |
| D. | dp/ρ2 + v.dv + g.dz = 0 |
| Answer» C. dp/ρ + v.dv + g2.dz = 0 | |
| 89. |
With regard to hydraulic ram, which of the following statements is incorrect? |
| A. | It works automatically |
| B. | It requires very little maintenance |
| C. | Its running cost is high |
| D. | It has no moving parts |
| Answer» D. It has no moving parts | |
| 90. |
Which of the following turbines is suitable for specific speed ranging from 300 to 1000 and heads below 30 m: |
| A. | Francis |
| B. | Kaplan |
| C. | Propeller |
| D. | Pelton. |
| Answer» C. Propeller | |
| 91. |
The power which appears in the expression for the specific speed is the: |
| A. | Shaft power |
| B. | Water power |
| C. | Power into the turbine |
| D. | None of the above. |
| Answer» B. Water power | |
| 92. |
In a laminar flow, Reynold’s number is |
| A. | Less than 2000 |
| B. | More than 2000 |
| C. | More than 2000 but less than 4000 |
| D. | None of the above. |
| Answer» B. More than 2000 | |
| 93. |
The Bernoulli’s equation written in the conventional form p/ρg + V2/2g + z = constant total energy per unit of certain quantity. Identify this quantity from the choices given below: |
| A. | Energy per unit mass |
| B. | Energy per unit weight |
| C. | Energy per unit volume |
| D. | Energy per unit specific weight. |
| Answer» C. Energy per unit volume | |
| 94. |
The co-efficient of discharge (Cd) of venturimeter lies within the limits: |
| A. | 0.95 to 0.99 |
| B. | 0.8 to 0.85 |
| C. | 0.7 to 0.8 |
| D. | 0.6 to 0.7 |
| Answer» B. 0.8 to 0.85 | |
| 95. |
The energy loss in a pipeline is due to |
| A. | Surface roughness only |
| B. | Viscous action only |
| C. | Friction offered by pipe wall as well as by viscous function |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 96. |
The force exerted by a jet of water on a moving vertical plate, in the direction of motion of plate is given by |
| A. | ρaV2 |
| B. | ρaV3 |
| C. | ρa (V – u)2 |
| D. | ρa (V – u)3 |
| Answer» D. ρa (V – u)3 | |
| 97. |
A Pitot-tube is used for measuring: |
| A. | Velocity of flow |
| B. | Pressure of flow |
| C. | Flow rate |
| D. | Total energy. |
| Answer» B. Pressure of flow | |
| 98. |
The Darcy-Weisbach friction factor f which is a direct measure of resistance to flow in pipes depends on which of the following? |
| A. | Relative roughness, velocity and viscosity |
| B. | Relative roughness, diameter and viscosity |
| C. | Roughness height, diameter and velocity |
| D. | Roughness height, diameter, velocity and kinematic viscosity. |
| Answer» E. | |
| 99. |
Which of the following statements with regard to the purposes served by hydraulic units is incorrect? |
| A. | Hydraulic torque converter is used for transmitting increased or decreased torque to the driven shaft. |
| B. | Hydraulic ram is a pump that is used to lift small quantities of water to greater heights from large quantity of water available at small heights. |
| C. | Hydraulic intensifier stores the energy of fluid in the form of pressure energy and is used for lifting heavy weights. |
| D. | Hydraulic accumulator stores the energy of a fluid in the form of pressure energy; that helps to reduce |
| Answer» D. Hydraulic accumulator stores the energy of a fluid in the form of pressure energy; that helps to reduce | |
| 100. |
An ice-cube is floating in glass of water. As the cube melts the water level |
| A. | Remain constant |
| B. | Falls |
| C. | Rises |
| D. | None of the above. |
| Answer» C. Rises | |