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.
| 1451. |
Self-priming centrifugal pump can be used for |
| A. | booster service. |
| B. | pumping liquid fertilisers (e.g. liquid NH3). |
| C. | pumping industrial wastes. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1452. |
The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) |
| A. | V2 |
| B. | 1/V2 |
| C. | 1/V |
| D. | V |
| Answer» B. 1/V2 | |
| 1453. |
Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid. |
| A. | 2 to 3 |
| B. | 0.01 to 0.10 |
| C. | 200 to 300 |
| D. | 100 to 1000 |
| Answer» B. 0.01 to 0.10 | |
| 1454. |
In a fluidised bed reactor |
| A. | temperature gradients are very high. |
| B. | temperature is more or less uniform. |
| C. | hot spots are formed. |
| D. | segregation of the solids occurs. |
| Answer» C. hot spots are formed. | |
| 1455. |
The head loss in turbulent flow in a pipe varies |
| A. | as velocity |
| B. | as (velocity)2 |
| C. | inversely as the square of diameter |
| D. | inversely as the velocity |
| Answer» C. inversely as the square of diameter | |
| 1456. |
A rotameter works on the principle of __________ pressure drop. |
| A. | constant |
| B. | variable |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» B. variable | |
| 1457. |
Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition. |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 1458. |
What causes convective acceleration in fluid flow ? |
| A. | Steep slope in flow |
| B. | Unsteady nature of flow |
| C. | Non-uniformity of flow |
| D. | Turbulence in flow |
| Answer» D. Turbulence in flow | |
| 1459. |
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be |
| A. | Δp |
| B. | 2Δp |
| C. | Δp2 |
| D. | Δp/2 |
| Answer» C. Œîp2 | |
| 1460. |
What is the normal range of exit cone angle of a venturimeter ? |
| A. | 2 to 5 |
| B. | 7 to 15 |
| C. | 15 to 25 |
| D. | >25 |
| Answer» C. 15 to 25 | |
| 1461. |
The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/f)-0.4, is called the __________ equation. |
| A. | Nikuradse |
| B. | Von-Karman |
| C. | Blausius |
| D. | Colebrook |
| Answer» B. Von-Karman | |
| 1462. |
In a dry packed bed, the pressure drop will be changed by increasing the flow rate as |
| A. | V1.8 |
| B. | V-0.8 |
| C. | V |
| D. | V-1 |
| Answer» B. V-0.8 | |
| 1463. |
The continuity equation |
| A. | relates mass flow rate along a stream tube. |
| B. | relates work and energy. |
| C. | stipulates that Newton's second law of motion must be satisfied at every point in the fluid. |
| D. | none of these. |
| Answer» B. relates work and energy. | |
| 1464. |
For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be |
| A. | V1 < V2 < V3 |
| B. | V2 > V1 and V2 > V3 |
| C. | V1 > V2 > V3 |
| D. | none of these. |
| Answer» C. V1 > V2 > V3 | |
| 1465. |
The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by |
| A. | 4x |
| B. | 2x |
| C. | x |
| D. | x |
| Answer» D. x | |
| 1466. |
The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid. |
| A. | Bingham |
| B. | Newtonion |
| C. | perfect |
| D. | none of these |
| Answer» C. perfect | |
| 1467. |
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of |
| A. | relative roughness. |
| B. | absolute roughness. |
| C. | friction co-efficient for flows at equal Reynold number. |
| D. | all (a), (b) & (c). |
| Answer» D. all (a), (b) & (c). | |
| 1468. |
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, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 1469. |
Fluidised beds are formed, when the |
| A. | fluid friction is zero |
| B. | gravity force is less than the fluid friction. |
| C. | pressure forces equal gravity forces. |
| D. | sum of the fluid friction and pressure forces is equal and opposite to gravity forces. |
| Answer» C. pressure forces equal gravity forces. | |
| 1470. |
A hydraulic ram acts as a/an __________ pump. |
| A. | centrifugal |
| B. | reciprocating |
| C. | impulse |
| D. | parallel cylinder |
| Answer» D. parallel cylinder | |
| 1471. |
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. | |
| 1472. |
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. | |
| 1473. |
The fluid property which matters for fall-ing rain drops to acquire spherical shape is its |
| A. | pressure |
| B. | height of descend |
| C. | viscosity |
| D. | surface tension |
| Answer» E. | |
| 1474. |
Check valve is used for __________ flow. |
| A. | very precise control of |
| B. | unidirectional |
| C. | multidirectional |
| D. | none of these |
| Answer» C. multidirectional | |
| 1475. |
If the discharge of a centrifugal pump is throttled, then its suction lift |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | data insufficient to predict |
| Answer» B. decreases | |
| 1476. |
Froude number is not a factor |
| A. | for Reynolds number greater than 300. |
| B. | when there is no vortex formation. |
| C. | for unbaffled tank. |
| D. | none of these. |
| Answer» C. for unbaffled tank. | |
| 1477. |
For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is |
| A. | more |
| B. | less |
| C. | equal |
| D. | more or less, depending on the type of particle |
| Answer» B. less | |
| 1478. |
In case of end to end connection of two or more pipes in series, the __________ each pipe. |
| A. | same rate of flow passes through |
| B. | head loss is same through |
| C. | rate of flow in each pipe is proportional to the length of |
| D. | total flow rate is the sum of flow rate in |
| Answer» B. head loss is same through | |
| 1479. |
Diaphragm pumps are used to transport |
| A. | solids |
| B. | liquids |
| C. | fluids |
| D. | slurries |
| Answer» E. | |
| 1480. |
The rate of shear versus the shear stress curves are time dependent for __________ fluid. |
| A. | thixotropic |
| B. | rheopectic |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1481. |
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 | |
| 1482. |
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. | |
| 1483. |
A stream tube is that, which has __________ cross-section entirely bounded by stream lines. |
| A. | a circular |
| B. | any convenient |
| C. | a small |
| D. | a large |
| Answer» C. a small | |
| 1484. |
Potential function is applicable only for __________ flow. |
| A. | irrotational |
| B. | turbulent |
| C. | steady |
| D. | none of these |
| Answer» B. turbulent | |
| 1485. |
In case of laminar flow of fluid through a circular pipe, the |
| A. | shear stress over the cross-section is proportional to the distance from the surface of the pipe. |
| B. | surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder. |
| C. | velocity profile varies hyperbolically and the shear stress remains constant over the cross-section. |
| D. | average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius). |
| Answer» C. velocity profile varies hyperbolically and the shear stress remains constant over the cross-section. | |
| 1486. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature ) |
| A. | 1/T |
| B. | 1/T |
| C. | T |
| D. | T |
| Answer» D. T | |
| 1487. |
Horsepower requirement for given pump capacity depends upon the |
| A. | specific gravity of the liquid |
| B. | suction lift |
| C. | discharge head |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1488. |
The curve of metacentre for a floating body __________ the curve of buoyancy. |
| A. | is always below |
| B. | is the evolute of |
| C. | intersects at right angle |
| D. | is tangential to |
| Answer» C. intersects at right angle | |
| 1489. |
__________ isused for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline. |
| A. | Venturimeter |
| B. | Pressure gauge |
| C. | Pitot tube |
| D. | Orificemeter |
| Answer» D. Orificemeter | |
| 1490. |
Rubber latex is an example of a __________ .fluid. |
| A. | pseudoplastic |
| B. | bingham plastic |
| C. | dilatent |
| D. | Newtonion |
| Answer» B. bingham plastic | |
| 1491. |
Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around |
| A. | 2000 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» E. | |
| 1492. |
Terminal velocity is |
| A. | a constant velocity with no acceleration. |
| B. | a fluctuating velocity. |
| C. | attained after moving one-half of total distance. |
| D. | none of these. |
| Answer» B. a fluctuating velocity. | |
| 1493. |
An isentropic process is the one, in which |
| A. | pv = constant |
| B. | pvr = constant |
| C. | pvr = constant, and process is reversible |
| D. | none of these |
| Answer» D. none of these | |
| 1494. |
The distribution of shear stress in a stream of fluid in a circular tube is |
| A. | linear with radius for turbulent flow only. |
| B. | linear with radius for laminar flow only. |
| C. | linear with radius for both laminar & turbulent flow. |
| D. | parabolic with radius for both laminar & turbulent flow. |
| Answer» D. parabolic with radius for both laminar & turbulent flow. | |
| 1495. |
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. | |
| 1496. |
Air vessel provided in a reciprocating pump is for |
| A. | increasing the acceleration head. |
| B. | making the friction in pipe uniform. |
| C. | decreasing the acceleration head. |
| D. | none of these. |
| Answer» C. decreasing the acceleration head. | |
| 1497. |
Maintenance cost of a __________ pump for a particular duty is the least. |
| A. | centrifugal |
| B. | reciprocating |
| C. | volute |
| D. | gear |
| Answer» B. reciprocating | |
| 1498. |
The ratio of wall drag to total drag in the Stoke's law range is |
| A. | 0.5 |
| B. | 1 |
| C. | 43525 |
| D. | 43526 |
| Answer» E. | |
| 1499. |
If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is |
| A. | same in both the tubes. |
| B. | greater in 1 mm dia tube. |
| C. | greater in 0.5 mm dia tube. |
| D. | zero in both the tubes. |
| Answer» D. zero in both the tubes. | |
| 1500. |
Stoke's law is valid, when the particle Reynolds number is |
| A. | < 1 |
| B. | > 1 |
| C. | < 5 |
| D. | none of these |
| Answer» B. > 1 | |