MCQOPTIONS
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MCQOPTIONS
This section includes 1608 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
*$_Open channel liquid flow is most conveniently measured by a? |
| A. | Hot wire anemometer |
| B. | Notch |
| C. | Rotameter |
| D. | Segmental orifice |
| Answer» C. Rotameter | |
| 252. |
*$_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 | |
| 253. |
*$_For laminar flow of Newtonion fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to(where, μ = fluid viscosity )? |
| A. | μ |
| B. | 1/μ |
| C. | ‚à öŒº |
| D. | 1/‚à öŒº |
| Answer» C. ‚Äö√ √∂≈í¬∫ | |
| 254. |
*$_Molten soap mass is transported by a __________ pump.? |
| A. | Diaphragm |
| B. | Reciprocating |
| C. | Gear |
| D. | Centrifugal |
| Answer» E. | |
| 255. |
*$_Centrifugal pumps as compared to reciprocating pumps? |
| A. | Run at a lower speed for the same discharge |
| B. | Do not need priming |
| C. | Deliver fluid with pulsating/fluctuating discharge |
| D. | Can be run with discharge line valve closed for a short interval |
| Answer» E. | |
| 256. |
*$_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. | |
| 257. |
*$_One horsepower is equal to? |
| A. | 550 lbf.ft/second |
| B. | 550 kgf.m/second |
| C. | Both A and B |
| D. | 550 lbf.ft./hr |
| Answer» B. 550 kgf.m/second | |
| 258. |
*$_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 | |
| 259. |
*$_Differential manometer measures the? |
| A. | Atmospheric pressure |
| B. | Sub-atmospheric pressure |
| C. | Pressure difference between two points |
| D. | None of these |
| Answer» D. None of these | |
| 260. |
*$_A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m³ ) is to be fluidised by water (density 1000 kg/m³ ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is? |
| A. | 4.4 KPa |
| B. | 2.94 KPa |
| C. | 3.7 KPa |
| D. | None of these |
| Answer» B. 2.94 KPa | |
| 261. |
*$_Pick out the correct statement.? |
| A. | Human blood is a Newtonion fluid |
| B. | A Newtonion fluid obeys Newton's law of cooling |
| C. | For a non-Newtonion fluid, a straight line passes through the origin in a plot between shear stress and shear gradient |
| D. | Thin lubricating oil is an example of a non-Newtonion fluid |
| Answer» C. For a non-Newtonion fluid, a straight line passes through the origin in a plot between shear stress and shear gradient | |
| 262. |
*$_Enamels and paints are generally __________ fluid.? |
| A. | Reheopectic |
| B. | Pseudo-plastic |
| C. | Thixotropic |
| D. | Dilatant |
| Answer» C. Thixotropic | |
| 263. |
*$_A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by? |
| A. | Decreasing the size of the inlet pipe |
| B. | Increasing the size of the inlet pipe |
| C. | Lowering the pump position |
| D. | Both B and C |
| Answer» E. | |
| 264. |
*$_For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to? |
| A. | ‚à öx |
| B. | 1/‚à öx |
| C. | X |
| D. | 1/x |
| Answer» B. 1/‚Äö√ √∂x | |
| 265. |
*$_Steady uniform flow is represented by flow through a/an? |
| A. | Long pipe at constant rate |
| B. | Long pipe at decreasing rate |
| C. | Expanding tube at constant rate |
| D. | None of these |
| Answer» B. Long pipe at decreasing rate | |
| 266. |
*$_Propellers are? |
| A. | Axial flow mixers |
| B. | Low speed impeller |
| C. | Used for mixingliquids of high viscosity |
| D. | Radial flow mixers |
| Answer» B. Low speed impeller | |
| 267. |
*$_Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is? |
| A. | Q/2 |
| B. | Q/4 |
| C. | Q/8 |
| D. | Q/16 |
| Answer» E. | |
| 268. |
*$_Which of the following pipe bends will incur the largest head loss ?? |
| A. | U-bend |
| B. | 30° bend |
| C. | 45° bend |
| D. | 90° bend |
| Answer» B. 30¬¨‚àû bend | |
| 269. |
*$_The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the? |
| A. | Length is shorter |
| B. | Throat diameter is more |
| C. | Sudden expansion of flow in the downstream occurs |
| D. | Distance between the throat and the inlet is more |
| Answer» D. Distance between the throat and the inlet is more | |
| 270. |
*$_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. | |
| 271. |
*$_A venturimeter can not be used for the direct measurement of? |
| A. | Datum difference in the stretch of pipeflow |
| B. | Pressure difference in the flow throughpipeline |
| C. | Friction loss in pipe flow |
| D. | All of the above |
| Answer» E. | |
| 272. |
*$_Cp/Cv is termed as? |
| A. | Adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 273. |
*$_A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 274. |
*$_Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the? |
| A. | Pipe length |
| B. | Fluid velocity in the pipe |
| C. | Time taken to close the valve |
| D. | All of the above |
| Answer» E. | |
| 275. |
*$_Turbine impeller? |
| A. | Produces only radial current |
| B. | Produces only tangential current |
| C. | Is effective over wide range of viscosities |
| D. | Does not produce tangential current |
| Answer» D. Does not produce tangential current | |
| 276. |
*$_Euler's equation of motion is a statement expressing? |
| A. | Conservation of mass |
| B. | Conservation of energy |
| C. | Newton's first law of motion |
| D. | Newton's second law of motion |
| Answer» B. Conservation of energy | |
| 277. |
*$_A piezometer opening measures the __________ fluid pressure.? |
| A. | Static |
| B. | Undisturbed |
| C. | Total |
| D. | Dynamic |
| Answer» C. Total | |
| 278. |
*$_The temperature in isentropic flow? |
| A. | Does not depend on Mach number |
| B. | Depends on Mach number only |
| C. | Cannot drop and then increase again downstream |
| D. | None of these |
| Answer» C. Cannot drop and then increase again downstream | |
| 279. |
*$_Which of the following exemplifies a three dimensional fluid flow ?? |
| A. | Fluid flow at the inlet to a nozzle |
| B. | Fluid flow between parallel plates |
| C. | Viscous fluid flow between converging plates |
| D. | None of these |
| Answer» B. Fluid flow between parallel plates | |
| 280. |
*$_The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.? |
| A. | Inlet tip of a blade curves in a direction opposite to that |
| B. | Outlet tip of a blade curves in a direction opposite to that |
| C. | Inlet tip of a blade is towards the direction |
| D. | Outlet tip of a blade is towards the direction |
| Answer» E. | |
| 281. |
*$_The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid.? |
| A. | Dilatant |
| B. | Pseudoplastic |
| C. | Bingham plastic |
| D. | Newtonion |
| Answer» B. Pseudoplastic | |
| 282. |
*$_Steady flow occurs, when the? |
| A. | Conditions change steadily with time |
| B. | Conditions are the same at the adjacent points at any instant |
| C. | Conditions do not change with time at any point |
| D. | Rate of the velocity change is constant |
| Answer» D. Rate of the velocity change is constant | |
| 283. |
*$_The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.? |
| A. | Hyperbola |
| B. | Parabola |
| C. | Semi-circle |
| D. | Semi-ellipse |
| Answer» C. Semi-circle | |
| 284. |
*$_The line traced by a single fluid particle as it moves over a period of time is called __________ line.? |
| A. | Stream |
| B. | Path |
| C. | Equipotential |
| D. | None of these |
| Answer» C. Equipotential | |
| 285. |
*$_The friction factor for turbulent flow in a hydraulically smooth pipe? |
| A. | Depends only on Reynolds number |
| B. | Does not depend on Reynolds number |
| C. | Depends on the roughness |
| D. | None of these |
| Answer» B. Does not depend on Reynolds number | |
| 286. |
*$_One stoke (unit of kinematic viscosity) is equivalent to? |
| A. | 1 cm²/second |
| B. | 1 m²/second |
| C. | 1 gm/cm. second |
| D. | 1 kg . m/second |
| Answer» B. 1 m¬¨‚â§/second | |
| 287. |
*$_Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f‚ÇÅ and that for smooth pipe is f‚ÇÇ. Pick out the correct statement.? |
| A. | f‚ÇÅ = f‚ÇÇ |
| B. | f‚ÇÅ < f‚ÇÇ |
| C. | f‚ÇÅ > f‚ÇÇ |
| D. | Data not sufficient to relate f‚ÇÅ & f‚ÇÇ |
| Answer» D. Data not sufficient to relate f‚Äö√á√Ö & f‚Äö√á√á | |
| 288. |
*$_Hydraulic intensifier is used for increasing the? |
| A. | Rate of velocity of liquid supply |
| B. | Rate of flow through delivery pipeline of a pump |
| C. | Intensity of pressure of the liquid |
| D. | Momentum rate through delivery pipe |
| Answer» D. Momentum rate through delivery pipe | |
| 289. |
*$_The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is? |
| A. | 0.1 |
| B. | 0.55 |
| C. | 0.95 |
| D. | 1.85 |
| Answer» D. 1.85 | |
| 290. |
*$_Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the? |
| A. | Drag on particles |
| B. | Drag on coloumn walls |
| C. | Bed height |
| D. | Bed voidage |
| Answer» D. Bed voidage | |
| 291. |
*$_The discharge co-efficient for an orificemeter does not depend upon the? |
| A. | Pipe length |
| B. | Ratio of pipe diameter to orifice diameter |
| C. | Type of orifice & the Reynolds number |
| D. | Pipe diameter |
| Answer» B. Ratio of pipe diameter to orifice diameter | |
| 292. |
*$_Hot wire anemometer is used to measure the? |
| A. | Velocity of liquids |
| B. | Temperature of liquids |
| C. | Velocity of gases |
| D. | Pressure of liquids |
| Answer» D. Pressure of liquids | |
| 293. |
*$_Dean number is concerned with the? |
| A. | Fluid-particle interaction |
| B. | Fluid flow through helical pipes |
| C. | Power consumption in agitated vessels |
| D. | Psychrometry |
| Answer» C. Power consumption in agitated vessels | |
| 294. |
*$_In a stabilised soap bubble, pressure inside it compared to external pressure is? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Unpredictable |
| Answer» B. Less | |
| 295. |
*$_In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller.? |
| A. | Speed of |
| B. | Diameter of |
| C. | Fluid velocity leaving |
| D. | All of the above |
| Answer» E. | |
| 296. |
*$_The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids? |
| A. | Having high viscosities |
| B. | Moving at low velocities |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 297. |
*$_Potential flow is characterised by the? |
| A. | Irrotational and frictionless flow |
| B. | Irrotational and frictional flow |
| C. | One in which dissipation of mechanical energy into heat occurs |
| D. | Formation of eddies within the stream |
| Answer» B. Irrotational and frictional flow | |
| 298. |
*$_In fluid flow, the boundary layer separation can not occur? |
| A. | In case of boundaries experiencing form drag |
| B. | At points of abrupt changes in the flow directions |
| C. | In laminar flow |
| D. | None of these |
| Answer» E. | |
| 299. |
*$_The pressure head of a flow meter remains constant for? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Rotameter |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 300. |
*$_Minimum porosity for fluidisation is? |
| A. | That corresponding to static bed |
| B. | That corresponding to completely fluidised bed |
| C. | The porosity of the bed when true fluidisation begins |
| D. | Less than that of the' static bed |
| Answer» D. Less than that of the' static bed | |