chemical engineering fluid mechanics for chemical chemical engineering Mcqs
401. The kinetic energy correction factor for velocity distribution of laminar flow is_________________?
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A. 1

B. 2

C. 1.66

D. 0.5

402. Pitot tube measures the ______________ of a fluid?
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A. Average velocity

B. Average flow rate

C. Point velocity

D. Pressure

403. What is the normal range of exit cone angle of a Venturimeter ?
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A. 15 to 25

B. 7 to 15

C. 2 to 5

D. >25

404. Drag co-efficient in hindered settling is _____________ that in free settling?
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A. Equal to

B. Not necessarily greater than

C. Always greater than

D. Less than

405. Net positive suction head (NPSH) of a centrifugal pump must be____________________?
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A. Less than barometric pressure

B. Less than the vapour pressure of the liquid

C. Equal to the vapour pressure of the liquid

D. Greater than the vapour pressure of the liquid
406. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?
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A. All A., B. and C.

B. BHP required by the pump

C. NPSH required

D. Head of the liquid pumped

407. Which of the fluid forces are not considered in the Reynolds equation of flow ?
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A. Turbulent forces

B. Viscous forces

C. Compressibility forces

D. Pressure forces

408. Eulers equation of motion is a statement expressing____________________?
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A. Newtons first law of motion

B. Newtons second law of motion

C. Conservation of energy

D. Conservation of mass
409. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 ?
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A. Decreases linearly with V

B. None of these

C. Decreases as V2

D. Increases linearly with V
410. In fluid flow, the boundary layer separation cannot occur___________________?
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A. In case of boundaries experiencing form drag

B. At points of abrupt changes in the flow directions

C. None of these

D. In laminar flow

411. The inherent characteristic of an equal percentage valve relating flow rate q with valve stem movement x are described by the equation_________________?
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A. dq/dx = K/q

B. dq/dx = K

C. dq/dx = K.q

D. dq/dx = Kq2

412. Two dimensional stream function________________?
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A. Is constant along an equipotential surface

B. None of these

C. Relates velocity and pressure

D. Is constant along a stream line
413. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) ?
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A. 1/M

B. 1/?M

C. ?M

D. M

414. Friction produced by the formation of wakes is called the ______________ friction?
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A. None of these

B. Skin

C. Disk

D. Form
415. What is the normal range of exit cone angle of a Venturimeter ?
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A. 7 to 15

B. 2 to 5

C. >25

D. 15 to 25

416. Which of the following has the minimum compressibility ?
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A. Nitrogen at room temperature

B. Oxygen at room temperature

C. Water at room temperature

D. Air at room temperature

417. Surge tanks are provided in high pressure water pipelines to___________________?
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A. Facilitate easy dismantling of pipeline for cleaning and maintenance

B. None of these

C. Store a definite quantity of water all the time

D. Reduce the water hammer
418. Purpose of hydraulic accumulator is to_______________?
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A. Ensure intermittent supply of hydraulic pressure

B. Accumulate pressure to increase force

C. Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

D. Increase the pressure and store/ accumulate it

419. Each term of the Bernoullis equation written in the form, (p/?) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?
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A. None of these

B. Mass

C. Volume

D. Specific weight

420. Which of the following can be used for the direct measurement of volumetric flow rate of slurry ?
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A. Rotameter

B. Pitot tube

C. Venturimeter

D. Orificemeter

421. For an unstable equilibrium of a floating body (where, M = metacentre.) ?
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A. M is below G

B. None of these

C. M is above G

D. M & G coincide

422. Which of the following pipe bends will incur the largest head loss ?
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A. U-bend

B. 45 bend

C. 90 bend

D. 30 bend

423. Two liquids manometer is used for measuring small pressure differences in___________________?
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A. None of these

B. Gases

C. Liquids

D. Mixture of hydrocarbons

424. ____________ is used for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline?
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A. Orificemeter

B. Pitot tube

C. Pressure gauge

D. Venturimeter

425. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________?
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A. Increases exponentially

B. Remains unchanged

C. Increases

D. Decreases
426. Centrifugal pump is normally classified on the basis of the________________?
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A. Type of casing

B. rpm

C. Impeller blade angle

D. Number of blades in impeller

427. Re/NFr is called the _____________ number?
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A. Brinkman

B. Archimedes

C. Galileo

D. Euler

428. Small pressure differences in liquids is measured using a/an__________________?
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A. None of these

B. Pitot tube

C. Inclined tube manometer

D. U-tube manometer

429. Experimental study of laminar fluid flow through a circular tube was conducted by____________________?
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A. Reynolds

B. Pascal

C. Hagen and Poiseuille

D. Blake-Plummer

430. A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?
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A. 325

B. 26

C. 42

D. 269
431. Acceleration head in a reciprocating pump_______________________?
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A. Does not change the work requirement of the pump

B. Increases the work done during suction stroke

C. Decreases the work done during suction stroke

D. Increases the work done during delivery stroke

432. Reynolds number is the ratio of____________________?
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A. Inertial forces to gravity forces

B. Inertial forces to viscous forces

C. Viscous forces to inertial forces

D. Viscous forces to gravity forces

433. What causes cavitation in centrifugal pump ?
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A. Low suction pressure

B. High suction velocity

C. High suction pressure

D. Low barometric pressure

434. Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of_________________?
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A. Powder & granular solids

B. Low melting point semi-solids

C. Liquids

D. All A, B & C
435. Check in a centrifugal pump is________________?
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A. Provided to prevent liquid from backing up through the pump when the pump is turned off or

B. All A., B. and C.

C. Provided in the discharge line

D. Generally a globe valve

E. idently stops running

436. The continuity equation in ideal fluid flow states that__________________?
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A. Net rate of inflow into any small volume must be zero

B. There exists a velocity potential

C. Energy is constant along a streamline

D. Energy is not constant along a streamline

437. A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?
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A. None of these

B. Head

C. Efficiency

D. Discharge
438. When a fluid flows over a solid surface, the___________________?
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A. Velocity gradient is zero at the solid surface

B. Velocity is uniform at any cross-section

C. Velocity is not zero at the solid surface

D. ers themselves

E. Resistance between the surface & the fluid is lesser as compared to that between the fluid

439. The dimension of dynamic viscosity is__________________?
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A. ML-1T-2

B. ML-1T-1

C. LT-2

D. L2T-1

440. Volume of liquid displaced by a floating body is equivalent to its_________________?
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A. Own weight

B. Submerged weight

C. Submerged volume

D. Own volume

441. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?
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A. Flat near the wall and parabolic in the middle

B. Flat

C. Parabolic

D. Parabolic near the wall and flat in the middle
442. Which of the following is the Blasius equation?, relating friction factor to the Reynolds number ?
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A. f = 0.079.NRe-0.25

B. f-0.5 = 4.07 loge (NRef)-0.6

C. Both a and b

D. None of these

443. The capacity of an accumulator is the maximum_________________?
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A. Energy which it can store

B. Liquid which it can store

C. Discharge which it can deliver

D. None of these

444. When the momentum of one fluid is used for moving another fluid, such a device is called a/an______________?
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A. Jet pump

B. None of these

C. Acid egg

D. Blower

445. Which of the following is a dimensionless parameter ?
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A. None of these

B. Kinematic viscosity

C. Angular velocity

D. Specific weight

446. Boiler feed water pump is usually a ______________ pump?
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A. Diaphragm

B. Gear

C. Multistage centrifugal

D. Reciprocating

447. Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds___________________?
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A. 2100

B. 3000

C. 1500

D. 4000

448. The ratio of the wall drag to the form drag in the Stokes law range (for motion of spherical particles in a stationary fluid) is__________________?
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A. 0.33

B. 2

C. 0.5

D. 1

449. Speed of sound in an ideal gas depends on its________________?
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A. Temperature

B. None of these

C. Specific volume

D. Pressure

450. A Bingham fluid of viscosity ? = 10 Pa.s and yield stress, ?0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is________________?
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A. 10 KPa

B. 20 KPa

C. 30 KPa

D. 40 KPa