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.
| 2101. |
__________ forces act on a particle moving through a stationary fluid. |
| A. | Gravity |
| B. | Drag |
| C. | Buoyant |
| D. | All of the above |
| Answer» E. | |
| 2102. |
Pick out the wrong statement about cavitation. |
| A. | Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation |
| B. | Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities |
| C. | Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise |
| D. | Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades |
| Answer» E. | |
| 2103. |
A venturimeter can not be used for the direct measurement of |
| A. | Datum difference in the stretch of pipeflow |
| B. | Pressure difference in the flow throughpipeline |
| C. | Friction loss in pipe flow |
| D. | All of the above |
| Answer» E. | |
| 2104. |
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 V²OM (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 | |
| 2105. |
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | Data insufficient to predict relative pressure drop |
| Answer» C. Remain unchanged | |
| 2106. |
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter. |
| A. | For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter |
| B. | Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter |
| C. | Venturimeter occupies less space than an orificemeter |
| D. | Venturimeter incurs less power loss compared to an equivalent orificemeter |
| Answer» D. Venturimeter incurs less power loss compared to an equivalent orificemeter | |
| 2107. |
Shear stress in a fluid flowing in a round pipe |
| A. | Varies parabolically across the cross-section |
| B. | Remains constant over the cross-section |
| C. | Is zero at the centre and varies linearly with the radius |
| D. | Is zero at the wall and increases linearly to the centre |
| Answer» D. Is zero at the wall and increases linearly to the centre | |
| 2108. |
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will |
| A. | Decrease |
| B. | Increase |
| C. | Remain same |
| D. | Unpredictable |
| Answer» B. Increase | |
| 2109. |
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air. |
| A. | 4πg/3 |
| B. | 0.01πgH/4 |
| C. | 0.01πgH/8 |
| D. | 0.04πgH/3 |
| Answer» B. 0.01πgH/4 | |
| 2110. |
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury) |
| A. | D |
| B. | 1/d |
| C. | Σ |
| D. | L/σ |
| Answer» D. L/σ | |
| 2111. |
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance). |
| A. | V/Vmax = (x/r)1/7 |
| B. | V/Vmax = (r/x)1/7 |
| C. | V/Vmax = (x.r)1/7 |
| D. | None of these |
| Answer» B. V/Vmax = (r/x)1/7 | |
| 2112. |
Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small. |
| A. | Thermal conductivity |
| B. | Electrical conductivity |
| C. | Specific gravity |
| D. | Electrical resistivity |
| Answer» C. Specific gravity | |
| 2113. |
Cavitation will begin when |
| A. | the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid |
| B. | pressure becomes more than critical pressure |
| C. | flow is increased |
| D. | pressure is increased |
| Answer» B. pressure becomes more than critical pressure | |
| 2114. |
Two pipe systems can be said to be equivalent, when the following quantites are same |
| A. | friction loss and flow |
| B. | length and diameter |
| C. | flow and length |
| D. | friction factor and diameter |
| Answer» B. length and diameter | |
| 2115. |
The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to |
| A. | 1 Pa |
| B. | 91 Pa |
| C. | 981 Pa |
| D. | 9810 Pa |
| Answer» E. | |
| 2116. |
For pipes, laminar flow occurs when Roynolds number is |
| A. | less than 2000 |
| B. | between 2000 and 4000 |
| C. | more than 4000 |
| D. | less than 4000 |
| Answer» B. between 2000 and 4000 | |
| 2117. |
A large Roynold number is indication of |
| A. | smooth and streamline flow |
| B. | laminar flow |
| C. | steady flow |
| D. | highly turbulent flow. |
| Answer» E. | |
| 2118. |
Froude number is significant in |
| A. | supersonics, as with projectile and jet propulsion |
| B. | full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. |
| C. | simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ships hulls |
| D. | all of the above |
| Answer» D. all of the above | |
| 2119. |
Mach number is significant in |
| A. | supersonics, as with projectiles and jet propulsion |
| B. | full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. |
| C. | simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ships hulls |
| D. | all of fhe above |
| Answer» B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. | |
| 2120. |
The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream |
| A. | keeps on increasing |
| B. | keeps on decreasing |
| C. | remains constant |
| D. | may increase/decrease |
| Answer» D. may increase/decrease | |
| 2121. |
In a free vortex motion, the radial component of velocity everywhere is |
| A. | maximum |
| B. | minimum |
| C. | zero |
| D. | non-zero and finite |
| Answer» D. non-zero and finite | |
| 2122. |
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to |
| A. | h2 |
| B. | V/T |
| C. | h2 |
| D. | h3/1. |
| Answer» D. h3/1. | |
| 2123. |
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is |
| A. | 0.83 |
| B. | 0.6 |
| C. | 0.4 |
| D. | 0.3 |
| Answer» C. 0.4 | |
| 2124. |
A streamline is defined as the line |
| A. | parallel to central axis flow |
| B. | parallel to outer surface of pipe |
| C. | of equal yelocity in a flow |
| D. | along which the pressure drop is uniform |
| Answer» D. along which the pressure drop is uniform | |
| 2125. |
Flow occurring in a pipeline when a valve is being opened is |
| A. | steady |
| B. | unsteady |
| C. | laminar |
| D. | vortex |
| Answer» C. laminar | |
| 2126. |
The flow in which each liquid particle has a definite path and their paths do not cross each other is called |
| A. | one dimensional flow |
| B. | uniform flow |
| C. | steady flow |
| D. | streamline flow. |
| Answer» E. | |
| 2127. |
True one-dimensional flow occurs when |
| A. | the direction and magnitude of the veiocity at all points are identical |
| B. | the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time |
| C. | the magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane |
| Answer» B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time | |
| 2128. |
Flow of water in a pipe about 3 metres in diameter can be measured by |
| A. | orifice plate |
| B. | venturi |
| C. | rotameter |
| D. | pitot tube |
| Answer» E. | |
| 2129. |
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be |
| A. | 1000 kg |
| B. | 4000 kg |
| C. | 2000 kg |
| D. | 8000 kg |
| Answer» B. 4000 kg | |
| 2130. |
In an immersed body, centre of pressure is |
| A. | at the centre of gravity |
| B. | above the centre of gravity |
| C. | below be centre of gravity |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 2131. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be |
| A. | 2 metres of water column |
| B. | 3 metres of water column |
| C. | 3.5 metres of water column |
| D. | 4 m of water column |
| Answer» C. 3.5 metres of water column | |
| 2132. |
An open vessel of water is accelerated up an inclined plane. The free water surface will |
| A. | be horizontal |
| B. | make an angle in direction of inclination of inclined plane |
| C. | make an angle in opposite direction to inclination of inclined plane |
| D. | any one of above is possible |
| Answer» D. any one of above is possible | |
| 2133. |
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ? |
| A. | 900 minutes |
| B. | 4 minutes |
| C. | 4 x (225)3/2 minutes |
| D. | 4 x V225 minutes. |
| Answer» E. | |
| 2134. |
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ? |
| A. | 10 m/sec |
| B. | 25 m/sec |
| C. | 2 m/sec |
| D. | 50 m/sec |
| Answer» D. 50 m/sec | |
| 2135. |
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to |
| A. | the weight of the body |
| B. | more than the weight of the body |
| C. | less than the weight of the body |
| D. | weight of the fluid displaced by the body |
| Answer» E. | |
| 2136. |
Metacentre is the point of intersection of |
| A. | vertical upward force through e.g. of body and center line of body |
| B. | buoyant force and the center line of body |
| C. | mid point between e.g. and center of buoyancy |
| D. | all of the above |
| Answer» C. mid point between e.g. and center of buoyancy | |
| 2137. |
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be |
| A. | 2 meters of water column |
| B. | 3 meters of water column |
| C. | 5 meters of water column |
| D. | 6 meters of water Column |
| Answer» E. | |
| 2138. |
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if |
| A. | the area is horizontal |
| B. | the area is vertical |
| C. | the area is inclined |
| D. | all of the above |
| Answer» E. | |
| 2139. |
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is |
| A. | 1 |
| B. | 5 |
| C. | 7 |
| D. | 6 |
| Answer» E. | |
| 2140. |
the force necessary to maintain equilibrium of a submerged body |
| A. | negligible |
| B. | zero |
| Answer» C. | |
| 2141. |
Center of pressure compared to e.g. is |
| A. | above it |
| B. | below it. |
| C. | at same point |
| D. | above or below depending on area of body |
| Answer» C. at same point | |
| 2142. |
Euler's dimensionless number relates the following |
| A. | inertial force and gravity |
| B. | viscous force and inertial force |
| C. | viscous force and buoyancy force |
| D. | pressure force and inertial force |
| Answer» E. | |
| 2143. |
A metal with specific gravity of o floating in a fluid of same specific gravity a will` |
| A. | sink to bottom |
| B. | float over fluid |
| C. | partly immersed |
| D. | be fully immersed with top surface at fluid surface |
| Answer» E. | |
| 2144. |
Which of the following instruments is used to measure flow on the application of Bernoulli's theorem |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | nozzle |
| D. | all of the above. |
| Answer» E. | |
| 2145. |
Pressure of the order of 10"' torr can be measured by |
| A. | Bourdon tube |
| B. | Pirani Gauge |
| C. | micro-manometer |
| D. | ionisastion gauge |
| Answer» E. | |
| 2146. |
Liquids transmit pressure equally in all the directions. This is according to |
| A. | Boyles law |
| B. | Archimedes principle |
| C. | Pascals law |
| D. | Newtons formula |
| Answer» D. Newtons formula | |
| 2147. |
The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will |
| A. | increase |
| B. | remain unaffected |
| C. | may increase or decrease depending on the characteristics of liquid |
| D. | decrease |
| Answer» E. | |
| 2148. |
The property by virtue of which a liquid opposes relative motion between its different layers is called |
| A. | surface tension |
| B. | co-efficient of viscosity |
| C. | viscosity |
| D. | osmosis |
| Answer» D. osmosis | |
| 2149. |
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately |
| A. | 1 mm |
| B. | 5 mm |
| C. | 10 mm |
| D. | 30 mm. |
| Answer» E. | |
| 2150. |
Surface energy per unit area of a surface is numerically equal to .. |
| A. | atmospheric pressure |
| B. | surface tension |
| C. | force of adhesion |
| D. | force of cohesion |
| Answer» C. force of adhesion | |