chemical engineering Mcqs
6301. The contraction co-efficient for Bordas mouthpiece (for frictionless fluid) is__________________?
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A. 0.1

B. 1

C. 0.5

D. 0.94

6302. Propeller type centrifugal pumps are most suitable for__________________?
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A. Low capacity at low heads

B. High capacity at low heads

C. High capacity at high heads

D. Low capacity at high heads

6303. A Rotameter works on the principle of _______________ pressure drop?
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A. Constant

B. Variable

C. Both A. & B.

D. Neither A. nor B.

6304. Horsepower requirement for given pump capacity depends upon the_______________?
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A. All A., B. and C.

B. Discharge head

C. Suction lift

D. Specific gravity of the liquid

6305. At high Reynolds number_________________?
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A. Inertial forces control and viscous forces are unimportant

B. Inertial forces are unimportant and viscous forces control

C. Viscous forces predominate

D. None of these

6306. An ideal fluid is___________________?
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A. One, which obeys Newtons law of viscosity

B. Highly viscous

C. None of these

D. Frictionless & incompressible
6307. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?
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A. Increases

B. None of these

C. Brings about no further reduction of

D. Decreases

6308. In fluid flow, cavitation is caused, if the____________________?
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A. Fluid velocity decreases to zero

B. Total energy decreases

C. Both A. and B.

D. Flow pressure approaches its vapor pressure at the prevailing temperature
6309. Remote control valve is a _______________ valve?
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A. Globe

B. Gate

C. Needle

D. Butterfly
6310. _____________________ pumps are a group of vacuum pumps ?
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A. Submerged

B. Mono

C. Hyster

D. Sump

6311. Which of the following properties of a fluid is responsible for offering resistance to shear ?
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A. Specific gravity

B. Viscosity

C. All A., B., and C.

D. Surface tension

6312. With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity___________________?
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A. Squeezes

B. Unpredictable from the data

C. Widens

D. Does not change
6313. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stokes law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?
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A. One fourth as that of A

B. Twice as that of A

C. Four times as that of A

D. Same as that of A

6314. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for ______________ fluid?
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A. Pseudo-plastic

B. Dilatant

C. Newtonian
6315. Drag co-efficient CD, in Stokes law range is given by________________?
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A. CD = 18.4/Re.p

B. 5.p

C. CD = 0.079/Re

D. CD = 16/Re.p

E. CD = 24/Re.p
6316. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?
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A. Newtonian

B. Bingham

C. None of these

D. Perfect

6317. If the discharge of a centrifugal pump is throttled, then its suction lift_______________________?
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A. Increases

B. Remains unchanged

C. Decreases

D. Data insufficient to predict

6318. Drag is the force component exerted on an immersed object, ?
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A. Passing the centroid of the body at 60to the direction of motion

B. The component being normal to the flow direction

C. None of these

D. The component being parallel to the flow direction
6319. Which of the following is not a dimension-less parameter ?
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A. Fanning friction factor

B. Specific gravity

C. Euler number

D. None of these
6320. Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(?/D) + (1.26/NRe ?F). It reduces to Nikuradse equation for a value of (?/D) equal to __________________?
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A. 0

B. 0.5

C. ?

D. 1
6321. The exit cone angle in case of a standard Venturimeter is _____________ the entrance cone angle?
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A. Either A. or B.

B. Greater than

C. Smaller than

D. Equal to

6322. Design of the casing of centrifugal pump should be such as to minimise the________________?
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A. None of these

B. Loss of static head

C. Loss of kinetic head

D. Back flow through impeller

6323. In case of a centrifugal pump, the theoretical head developed is dependent on the _____________ the impeller?
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A. Diameter of

B. Fluid velocity leaving

C. Speed of

D. All A., B. and C.
6324. The pressure intensity is the same in all directions at a point in a fluid________________?
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A. Regardless of the motion of one fluid layer relative to an adjacent layer

B. Only when the fluid is frictionless

C. When there is no motion of one fluid layer relative to an adjacent layer

D. Only when the fluid is at rest having zero velocity

6325. Froude number is not a factor__________________?
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A. When there is no vortex formation

B. For Reynolds number greater than 300

C. For unbaffled tank

D. None of these

6326. The line traced by a single fluid particle as it moves over a period of time is called ______________ line?
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A. None of these

B. Equipotential

C. Path

D. Stream

6327. Which of the following is used for pumping crude oil from oil well ?
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A. Duplex/triplex reciprocating pump

B. Gear pump

C. Screw pump

D. Single stage centrifugal pump

6328. The Mach number for hypersonic flow of compressible fluid is____________________?
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A. > 1

B. > 4

C. < 2

D. 1

6329. Propellers are____________________?
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A. Used for mixing liquids of high viscosity

B. Radial flow mixers

C. Low speed impeller

D. Axial flow mixers
6330. For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, ? = fluid viscosity ) ?
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A. 1/??

B. ?

C. 1/?

D. ??

6331. Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?
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A. Radial

B. Axial

C. Mixed

D. None of these

6332. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?
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A. 2

B. 1.5

C. 1

D. 0.5

6333. Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is _____________ mm?
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A. < 10

B. 4

C. > 12.5
6334. The component of acceleration resulting due to unsteady nature of flow is called ____________ acceleration?
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A. Normal

B. Local

C. Tangential

D. Convective

6335. In an incompressible flow of fluid, the fluid ________________?
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A. Compressibility is greater than zero

B. Temperature remains constant

C. Is frictionless

D. Density does not change with pressure & temperature
6336. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________?
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A. Rotameter

B. Pitot tube

C. None of these

D. Manometer

6337. Hydraulic mean depth (Dm) for a circular pipe of diameter D flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
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A. Flow rate

B. Mean velocity

C. Both a & b

D. Neither a nor b

6338. Enamels and paints are generally _______________ fluid?
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A. Dilatant

B. Pseudo-plastic

C. Rheopectic

D. Thixotropic

6339. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________?
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A. Discharge pressure

B. Flow of liquid during operation of the pump

C. Back flow of fluid in the event of stoppage of pump

D. All A., B. and C.

6340. A stream line is___________________?
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A. Fixed in space in steady flow

B. Always the path of particle

C. A line connecting the mid points of flow cross-section

D. Drawn normal to the velocity vector at every point

6341. Terminal velocity is_____________________?
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A. Attained after moving one-half of total distance

B. A fluctuating velocity

C. A constant velocity with no acceleration

D. None of these

6342. A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?
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A. 42

B. 1.8

C. 17

D. 84

6343. Head developed by a centrifugal pump depends on its___________________?
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A. Speed

B. Impeller diameter

C. Both A. and B.

D. Neither A. nor B.

6344. Rubber latex is an example of ______________ fluid?
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A. Bingham plastic

B. Pseudo plastic

C. Dilatants

D. Newtonian

6345. Laminar flow is characterised by the nonexistence of_________________?
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A. Deviating velocities

B. Pressure fluctuation

C. Eddies

D. All A., B. & C.
6346. Hydraulic mean radius for flow through packed bed of spherical particle of size, Dp, with porosity ? is________________?
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A. ?Dp (?/1- ?)

B. ?Dp (1- ?/?)

C. (Dp/6) (?/1- ?)

D. (Dp/6) (1- ?/?)

6347. Steady uniform flow is represented by flow through a/an ___________________?
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A. Expanding tube at constant rate

B. None of these

C. Long pipe at decreasing rate

D. Long pipe at constant rate
6348. Differential manometer measures the___________________?
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A. Pressure gradient

B. Absolute pressure

C. Gauge pressure

D. Pressure difference
6349. In power law, ? = [A (du/dy)2 + B] then the fluid is__________________?
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A. Thixotropic

B. Dilatant

C. Newtonian

D. Rheopectic

6350. The distance between metacentre and ______________ is called metacentric height?
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A. Water surface

B. Centre of gravity

C. Centre of buoyancy

D. None of these