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.
| 2051. |
The normal stress is the same in all directions at a point in a fluid, when the fluid is |
| A. | Non-viscous |
| B. | Incompressible |
| C. | Both A and B |
| D. | Having no motion of one fluid layer relative to the other |
| Answer» E. | |
| 2052. |
Rise of liquid in a capillary tube is due to |
| A. | Cohesion |
| B. | Adhesion |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 2053. |
The nominal size of a hose pipe is specified by its |
| A. | I.D. |
| B. | O.D. |
| C. | Thickness |
| D. | None of these |
| Answer» B. O.D. | |
| 2054. |
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062. |
| A. | 10 m |
| B. | 11 m |
| C. | 12 m |
| D. | 20 m |
| Answer» C. 12 m | |
| 2055. |
Which of the following produces maximum pressure difference for transportation of gases? |
| A. | Vaccum pumps |
| B. | Blowers |
| C. | Fans |
| D. | Compressors |
| Answer» E. | |
| 2056. |
Air vessel provided in a reciprocating pump |
| A. | Smoothens the flow by avoiding pulsations |
| B. | Increases the volumetric efficiency of the pump |
| C. | Saves the pump from the danger of cavitation |
| D. | None of these |
| Answer» E. | |
| 2057. |
Bernoulli's equation describes the |
| A. | Mechanical energy balance in potential flow |
| B. | Kinetic energy balance in laminar flow |
| C. | Mechanical energy balance in turbulent flow |
| D. | Mechanical energy balance in boundary layer |
| Answer» B. Kinetic energy balance in laminar flow | |
| 2058. |
For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Independent of porosity |
| Answer» C. Equal | |
| 2059. |
A fluid element has a velocity V = -y² . xi + 2yx² . j. The motion at (x, y) = (l/√2, 1) is |
| A. | Rotational and incompressible |
| B. | Rotational and compressible |
| C. | Irrotational and compressible |
| D. | Irrotational and incompressible |
| Answer» C. Irrotational and compressible | |
| 2060. |
Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a |
| A. | Pitot tube |
| B. | Manometer |
| C. | Rotameter |
| D. | None of these |
| Answer» B. Manometer | |
| 2061. |
Open channel liquid flow is most conveniently measured by a |
| A. | Hot wire anemometer |
| B. | Notch |
| C. | Rotameter |
| D. | Segmental orifice |
| Answer» C. Rotameter | |
| 2062. |
Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss? |
| A. | Flow nozzle |
| B. | Venturimeter |
| C. | Rotameter |
| D. | Orificemeter |
| Answer» C. Rotameter | |
| 2063. |
The pump used for irrigation purposes is generally designed for |
| A. | Large capacity & high head |
| B. | Large capacity & low head |
| C. | Small capacity & high head |
| D. | Small capacity & low head |
| Answer» C. Small capacity & high head | |
| 2064. |
What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)? |
| A. | 0.61 - 0.63 |
| B. | 0.5 - 0.75 |
| C. | 0.75 - 0.90 |
| D. | 0.35 - 0.55 |
| Answer» B. 0.5 - 0.75 | |
| 2065. |
The velocity for subsonic flow in a pipeline |
| A. | Increases in the downstream direction |
| B. | Is constant |
| C. | Decreases in the downstream direction |
| D. | Is independent of the area of flow |
| Answer» B. Is constant | |
| 2066. |
Diaphragm valves are used for handling __________ fluids. |
| A. | Corrosive |
| B. | Viscous |
| C. | Non-Newtonion |
| D. | Solid suspended |
| Answer» B. Viscous | |
| 2067. |
Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head. |
| A. | Elevation |
| B. | Pressure |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» C. Both A and B | |
| 2068. |
For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by |
| A. | ∂u/∂x = 0 |
| B. | ∂(ρu)/∂x = 0 |
| C. | ∂u/∂x = - ∂ρ/∂t |
| D. | ∂ρ/∂t = 0 |
| Answer» B. ∂(ρu)/∂x = 0 | |
| 2069. |
A mono pump is a __________ pump. |
| A. | Centrifugal |
| B. | Piston |
| C. | Positive acting rotary |
| D. | A group of vacuum |
| Answer» D. A group of vacuum | |
| 2070. |
One horsepower is equal to |
| A. | 550 lbf.ft/second |
| B. | 550 kgf.m/second |
| C. | Both A and B |
| D. | 550 lbf.ft./hr |
| Answer» B. 550 kgf.m/second | |
| 2071. |
One dimensional flow implies |
| A. | Flow in a straight line |
| B. | Steady uniform flow |
| C. | Unsteady uniform flow |
| D. | A flow which does not account for changes in transverse direction |
| Answer» E. | |
| 2072. |
For pumping slurry, one can use a __________ pump. |
| A. | Reciprocating |
| B. | Diaphargm |
| C. | Centrifugal |
| D. | Pneumatic |
| Answer» C. Centrifugal | |
| 2073. |
Nominal size of a pipe is an indication of its __________ diameter. |
| A. | Inner |
| B. | Outer |
| C. | Approximate |
| D. | None of these |
| Answer» D. None of these | |
| 2074. |
Power required for mixing Newtonion fluids is a function of the |
| A. | Speed of impeller, diameter of impeller & viscosity |
| B. | Density & viscosity of fluid only |
| C. | Density of fluid, viscosity of fluid & impeller dia only |
| D. | None of these |
| Answer» E. | |
| 2075. |
The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 0.66 |
| Answer» B. 1 | |
| 2076. |
In the low Reynolds number region, the drag force on a sphere is proportional to |
| A. | V |
| B. | V2 |
| C. | V4 |
| D. | V0.5 |
| Answer» B. V2 | |
| 2077. |
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 | |
| 2078. |
In which of the following body shapes, the pressure drag is large compared to the friction drag? |
| A. | Stream line body |
| B. | Two dimensional body |
| C. | Bluff body |
| D. | None of these |
| Answer» D. None of these | |
| 2079. |
Centrifugal pumps as compared to reciprocating pumps |
| A. | Run at a lower speed for the same discharge |
| B. | Do not need priming |
| C. | Deliver fluid with pulsating/fluctuating discharge |
| D. | Can be run with discharge line valve closed for a short interval |
| Answer» E. | |
| 2080. |
Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe. |
| A. | Smaller than |
| B. | Larger than |
| C. | Same as |
| D. | Twice |
| Answer» B. Larger than | |
| 2081. |
An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic? |
| A. | Sewage sludge |
| B. | Rubber latex |
| C. | Blood |
| D. | Sugar solution |
| Answer» B. Rubber latex | |
| 2082. |
Which of the following is a Newtonian fluid? |
| A. | Rubber latex |
| B. | Sewage sludge |
| C. | Quicksand |
| D. | Non-colloidal solution |
| Answer» E. | |
| 2083. |
Which of the following properties of a fluid is responsible for offering resistance to shear? |
| A. | Surface tension |
| B. | Viscosity |
| C. | Specific gravity |
| D. | All of the above |
| Answer» C. Specific gravity | |
| 2084. |
Purpose of hydraulic accumulator is to |
| A. | Ensure intermittant supply of hydraulic pressure |
| B. | Increase the pressure and store/ accumulate it |
| C. | Accumulate pressure to increase force |
| D. | Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc |
| Answer» E. | |
| 2085. |
The distribution of shear stress in a stream of fluid in a circular tube is |
| A. | Linear with radius for turbulent flow only |
| B. | Linear with radius for laminar flow only |
| C. | Linear with radius for both laminar & turbulent flow |
| D. | Parabolic with radius for both laminar & turbulent flow |
| Answer» D. Parabolic with radius for both laminar & turbulent flow | |
| 2086. |
Fanning friction factor for laminar flow of fluid in a circular pipe is |
| A. | Not a function of the roughness of pipe wall |
| B. | Inversely proportional to Reynolds number |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 2087. |
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 | |
| 2088. |
Which of the following equations is valid for laminar flow of a fluid through packed bed? |
| A. | Fanning equation |
| B. | Kozney - Karman equation |
| C. | Hagen - Poiseuille equation |
| D. | Blake - Plummer equation |
| Answer» C. Hagen - Poiseuille equation | |
| 2089. |
For laminar flow of Newtonion fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to(where, μ = fluid viscosity ) |
| A. | μ |
| B. | 1/μ |
| C. | √μ |
| D. | 1/√μ |
| Answer» C. √μ | |
| 2090. |
Self-priming centrifugal pump can be used for |
| A. | Booster service |
| B. | Pumping liquid fertilisers (e.g. liquid NH₃) |
| C. | Pumping industrial wastes |
| D. | All of the above |
| Answer» E. | |
| 2091. |
With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases exponentially |
| Answer» C. Remains unchanged | |
| 2092. |
Pick out the correct statement pertaining to venturimeter. |
| A. | A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward |
| B. | The co-efficient of contraction of a venturimeter is always unity |
| C. | For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected |
| D. | None of these |
| Answer» E. | |
| 2093. |
Equivalent length of a pipe fitting is |
| A. | Dependent on Reynolds number |
| B. | Independent of Reynolds number |
| C. | Dependent on the length of the pipe |
| D. | None of these |
| Answer» B. Independent of Reynolds number | |
| 2094. |
Molten soap mass is transported by a __________ pump. |
| A. | Diaphragm |
| B. | Reciprocating |
| C. | Gear |
| D. | Centrifugal |
| Answer» E. | |
| 2095. |
One dimensional fluid flow implies the |
| A. | Flow in straight lines only |
| B. | Uniform flow |
| C. | Steady uniform flow |
| D. | Flow in which transverse components are zero |
| Answer» E. | |
| 2096. |
Dimension of absolute viscosity is |
| A. | ML⁻¹T⁻¹ |
| B. | MLT⁻¹ |
| C. | ML⁻¹T |
| D. | MLT |
| Answer» B. MLT⁻¹ | |
| 2097. |
Which of the following is not an advantage of fluidisation from transfer operation point of view? |
| A. | Intimate contact of the fluid with all parts of the solid particles |
| B. | Lower fluid pumping power requirement |
| C. | Minimisation of temperature variation |
| D. | Prevention of particle seggregation |
| Answer» C. Minimisation of temperature variation | |
| 2098. |
__________ forces do not act in case of fluid flow. |
| A. | Elastic |
| B. | Tensile |
| C. | Vibratory |
| D. | Centrifugal |
| Answer» C. Vibratory | |
| 2099. |
Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm. |
| A. | < 4 |
| B. | > 4 |
| C. | > 12.5 |
| D. | < 10 |
| Answer» D. < 10 | |
| 2100. |
Stoke's law is valid, when NNRe,p is less than |
| A. | 2 |
| B. | 100 |
| C. | 2100 |
| D. | 700 |
| Answer» B. 100 | |