MCQOPTIONS
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MCQOPTIONS
This section includes 659 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. |
Ratio of pressure and inertia force gives ______________ number? |
| A. | Weber |
| B. | Mach |
| C. | Euler |
| D. | Froude |
| Answer» D. Froude | |
| 252. |
Quicksand is an example of a __________ fluid? |
| A. | Bingham plastic |
| B. | Dilatant |
| C. | Newtonian |
| D. | Pseudo plastic |
| Answer» C. Newtonian | |
| 253. |
Purpose of relief valve in a reciprocating pump is to___________________? |
| A. | Protect the pump against developing excessive pressure |
| B. | Facilitate unidirectional flow of liquid |
| C. | Reduce the discharge pressure |
| D. | Control the rate of discharge |
| Answer» B. Facilitate unidirectional flow of liquid | |
| 254. |
Purpose of hydraulic accumulator is to_______________? |
| A. | Ensure intermittent 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. | |
| 255. |
Purpose of air lift pump is to____________________? |
| A. | Compress air |
| B. | Lift compressed air |
| C. | Lift water from a well by using compressed air |
| D. | Lift air under negative pressure |
| Answer» D. Lift air under negative pressure | |
| 256. |
______________ pumps are axial flow pumps? |
| A. | Turbine |
| B. | Propeller |
| C. | Diffuser |
| D. | None of these |
| Answer» C. Diffuser | |
| 257. |
_____________________ pumps are a group of vacuum pumps ? |
| A. | Hyster |
| B. | Sump |
| C. | Mono |
| D. | Submerged |
| Answer» B. Sump | |
| 258. |
Pumping of a corrosive liquid is generally preferred to be done by a ______________ pump, as it can be made of a variety of materials including plastics? |
| A. | Piston |
| B. | Gear |
| C. | Positive displacement |
| D. | Sump |
| Answer» C. Positive displacement | |
| 259. |
Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump? |
| A. | Reciprocating |
| B. | Plunger |
| C. | Electromagnetic |
| D. | Gear |
| Answer» D. Gear | |
| 260. |
_____________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm2? |
| A. | Centrifugal |
| B. | Piston |
| C. | Plunger |
| D. | Vane |
| Answer» D. Vane | |
| 261. |
Propellers are____________________? |
| A. | Axial flow mixers |
| B. | Low speed impeller |
| C. | Used for mixing liquids of high viscosity |
| D. | Radial flow mixers |
| Answer» B. Low speed impeller | |
| 262. |
Propeller type centrifugal pumps are most suitable for__________________? |
| A. | High capacity at high heads |
| B. | High capacity at low heads |
| C. | Low capacity at high heads |
| D. | Low capacity at low heads |
| Answer» C. Low capacity at high heads | |
| 263. |
Priming of a centrifugal pump is done to___________________? |
| A. | Increase the mass flow rate of fluid |
| B. | Develop effective pressure rise by the pump |
| C. | Avoid chances of separation inside the impeller |
| D. | None of these |
| Answer» D. None of these | |
| 264. |
Priming is needed in a ______________ pump? |
| A. | Reciprocating |
| B. | Gear |
| C. | Centrifugal |
| D. | Diaphragm |
| Answer» D. Diaphragm | |
| 265. |
Pressure drop in packed bed for turbulent flow is given by the ______________ equation? |
| A. | Kozeny-Carman |
| B. | Blake-Plummer |
| C. | Leva’s |
| D. | Hagen-Poiseuille’s |
| Answer» C. Leva’s | |
| 266. |
Pressure drop in a packed bed for laminar flow is given by the ______________ equation? |
| A. | Kozeny-Carman |
| B. | Blake-Plummer |
| C. | Leva’s |
| D. | Fanning friction factor |
| Answer» B. Blake-Plummer | |
| 267. |
Pressure drop in a fluidised bed reactor is ______________ that in a similar packed bed reactor? |
| A. | Less than |
| B. | Greater than |
| C. | Same as |
| D. | None of these |
| Answer» C. Same as | |
| 268. |
Pressure drop for turbulent fluid flow through a circular pipe is given by_________________? |
| A. | 64/Re |
| B. | 32μLV/gc.D2 |
| C. | 4f (L/D) (v2/2gc). ρ |
| D. | f (L/D) (v2/2gc). ρ |
| Answer» D. f (L/D) (v2/2gc). ρ | |
| 269. |
Pressure drop for laminar fluid flow through a circular pipe is given by__________________? |
| A. | 4f (L/D) (v2/2gc) ρ |
| B. | 32 (μLV/gc D2) |
| C. | 16/NRe |
| D. | (fLρ/D) (v2/2gc) |
| Answer» C. 16/NRe | |
| 270. |
Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as___________________? |
| A. | V1.8 |
| B. | V-0.2 |
| C. | V2.7 |
| D. | V2 |
| Answer» E. | |
| 271. |
Pressure drag does not depend upon the_________________? |
| A. | Roughness of surface of the body |
| B. | Pressure of main flow only |
| C. | Length of the body in flow direction |
| D. | All A., B. and C. |
| Answer» E. | |
| 272. |
Pressure co-efficient is the ratio of pressure forces to __________________________ forces? |
| A. | Gravity |
| B. | Inertial |
| C. | Viscous |
| D. | None of these |
| Answer» C. Viscous | |
| 273. |
Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)? |
| A. | H |
| B. | 12.6 H |
| C. | 13.6 H |
| D. | 14.6 H |
| Answer» C. 13.6 H | |
| 274. |
Prandtl number is a measure of the__________________? |
| A. | Heat conduction to viscosity of a fluid |
| B. | Cp/Cv of a fluid |
| C. | Elastic force to pressure force in the fluid flow |
| D. | Inertial force to elastic force in the fluid flow |
| Answer» B. Cp/Cv of a fluid | |
| 275. |
Prandtl mixing length is___________________? |
| A. | Applicable to laminar flow problems |
| B. | A universal constant |
| C. | Zero at the pipe wall |
| D. | None of these |
| Answer» D. None of these | |
| 276. |
Power requirement of fans having constant wheel diameter varies _____________ fan speed? |
| A. | As square of |
| B. | Directly as |
| C. | As cube of |
| D. | None of these |
| Answer» D. None of these | |
| 277. |
Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) ________________? |
| A. | N2D3 |
| B. | ND2 |
| C. | N2D |
| D. | N3D5 |
| Answer» E. | |
| 278. |
Power required for mixing Newtonian 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. | |
| 279. |
Power number is the ratio of____________________? |
| A. | Drag stress to inertial stress |
| B. | Inertial stress to drag stress |
| C. | Inertial stress to gravitational stress |
| D. | Gravitational stress to drag stress |
| Answer» B. Inertial stress to drag stress | |
| 280. |
Power loss in an orificemeter is _____________ that in a Venturimeter? |
| A. | Less than |
| B. | Same as |
| C. | More than |
| D. | Data insufficient, cannot be predicted |
| Answer» D. Data insufficient, cannot be predicted | |
| 281. |
Potential function is applicable only for __________ flow? |
| A. | Irrotational |
| B. | Turbulent |
| C. | Steady |
| D. | None of these |
| Answer» B. Turbulent | |
| 282. |
Potential flow is the flow of______________? |
| A. | Compressible fluids with shear |
| B. | Compressible fluids with no shear |
| C. | Incompressible fluids with shear |
| D. | Incompressible fluids with no shear |
| Answer» E. | |
| 283. |
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 | |
| 284. |
Poise is converted into stoke by ___________________? |
| A. | Multiplying with density (gm/c.c) |
| B. | Dividing by density (gm/c.c) |
| C. | Multiplying with specific gravity |
| D. | Dividing by specific gravity |
| Answer» C. Multiplying with specific gravity | |
| 285. |
Plunger pumps are used for__________________? |
| A. | Higher pressure |
| B. | Slurries |
| C. | Viscous mass |
| D. | None of these |
| Answer» B. Slurries | |
| 286. |
Pitot tube measures the ______________ of a fluid? |
| A. | Pressure |
| B. | Average velocity |
| C. | Average flow rate |
| D. | Point velocity |
| Answer» E. | |
| 287. |
Pipes having diameter 14 inches or more are designated by their_________________? |
| A. | Outside diameter |
| B. | Inside diameter |
| C. | Schedule number |
| D. | None of these |
| Answer» B. Inside diameter | |
| 288. |
Piezometric head is the sum of the ______________ heads? |
| A. | Elevation & kinetic energy |
| B. | Elevation & pressure |
| C. | Kinetic energy & pressure |
| D. | None of these |
| Answer» C. Kinetic energy & pressure | |
| 289. |
Pick out the wrong statement pertaining to fluid flow ? |
| A. | The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5 |
| B. | The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe |
| C. | Navier-Stokes equation is applicable to the analysis of viscous flows |
| D. | Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids |
| Answer» B. The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe | |
| 290. |
Pick out the wrong statement about a streamline ? |
| A. | It is always parallel to the main direction of the fluid flow |
| B. | It is a line across which there is no flow and it is equivalent to a rigid boundary |
| C. | Streamlines intersect at isolated point of zero velocity and infinite velocity |
| D. | The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity |
| Answer» B. It is a line across which there is no flow and it is equivalent to a rigid boundary | |
| 291. |
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 cannot damage pipeline, restrict fluid flow and damage steam turbine blades |
| Answer» E. | |
| 292. |
Pick out the Hagen-Poiseuille‟s equation ? |
| A. | Δp/ρ = 4f (L/D) (V2/2gc) |
| B. | Δp = 32 (μLV/gc. D2) |
| C. | Δp/L = 150 [(1 – ε)/ε3]. (μ.V0 2/g2cD) |
| D. | Δp/L = 1.75 [(1 – ε)/ε3]. (ρV0 2/gcDp) |
| Answer» C. Δp/L = 150 [(1 – ε)/ε3]. (μ.V0 2/g2cD) | |
| 293. |
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 negle |
| D. | None of these |
| Answer» E. | |
| 294. |
Pick out the correct statement pertaining to the flow through a converging-diverging tube ? |
| A. | The value of Mach number is always unity at the throat |
| B. | No shock wave develops in the tube when the Mach number at exit is greater than unity |
| C. | Throughout the converging portion of the tube, the density increases in the downstream direction |
| D. | None of these |
| Answer» C. Throughout the converging portion of the tube, the density increases in the downstream direction | |
| 295. |
Pick out the correct statement pertaining to transition/ entrance length in fluid flow ? |
| A. | The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is c |
| B. | Transition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to 0.05. D.NRe |
| C. | Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is equal to 50 D |
| D. | All A., B. and C. |
| Answer» E. | |
| 296. |
Permanent pressure loss in a well designed Venturimeter is about _____________ percent of the venturi differential? |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 50 |
| Answer» C. 30 | |
| 297. |
Permanent loss in a Venturimeter is about ___________ percent of the pressure drop in the upstream cone? |
| A. | 1 |
| B. | 10 |
| C. | 40 |
| D. | 70 |
| Answer» C. 40 | |
| 298. |
Path followed by water jet issuing from the bottom of a water tank will be a__________________? |
| A. | Parabola (vertex being at the opening) |
| B. | Hyperbola |
| C. | Horizontal straight line |
| D. | Zig-zag path (which is geometrically undefined) |
| Answer» B. Hyperbola | |
| 299. |
Pascal’s law is valid, only when the fluid is_____________________? |
| A. | Frictionless and at rest |
| B. | At rest |
| C. | At rest and when the frictionless fluid is in motion |
| D. | None of these |
| Answer» C. At rest and when the frictionless fluid is in motion | |
| 300. |
Pascal law is not applicable for a/an ________________________ fluid? |
| A. | Accelerating frictionless |
| B. | Static |
| C. | Uniformly moving |
| D. | None of these |
| Answer» E. | |