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.
| 1351. |
With a constant diameter impeller of a centrifugal pump |
| A. | its capacity varies directly as the square of speed. |
| B. | head varies as the square of speed. |
| C. | horsepower input varies as the square of speed. |
| D. | head varies as the speed. |
| Answer» C. horsepower input varies as the square of speed. | |
| 1352. |
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 coloumn 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 | |
| 1353. |
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. | |
| 1354. |
Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a |
| A. | pitot tube |
| B. | manometer |
| C. | rotameter |
| D. | none of these |
| Answer» B. manometer | |
| 1355. |
For a reciprocating pump, the indicator diagram is the graph between the |
| A. | discharge and overall efficiency. |
| B. | volume swept by piston for one complete revolution and the pressure in the cylinder. |
| C. | angle swept by the crank pin at any instant and the discharge. |
| D. | none of these. |
| Answer» C. angle swept by the crank pin at any instant and the discharge. | |
| 1356. |
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'? |
| A. | At the centre |
| B. | At d/4 from the wall |
| C. | At the wall |
| D. | At d/8 from the wall |
| Answer» D. At d/8 from the wall | |
| 1357. |
Cavitation occurs in a centrifugal pump when the suction pressure is |
| A. | less than the vapour pressure of the liquid at that temperature. |
| B. | greater than the vapour pressure of the liquid at that temperature. |
| C. | equal to the vapour pressure. |
| D. | equal to the developed head. |
| Answer» B. greater than the vapour pressure of the liquid at that temperature. | |
| 1358. |
The unit of bulk modulus of elasticity for a liquid in S.I. unit is |
| A. | N |
| B. | N/m |
| C. | N/m2 |
| D. | N/m3 |
| Answer» D. N/m3 | |
| 1359. |
With increase in the schedule number of a pipe of a particular nominal size, the |
| A. | wall thickness also increases. |
| B. | I.D. of the pipe decreases. |
| C. | O.D. of the pipe remains constant. |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1360. |
Fluid flow in a/an __________ is an example of pressure flow. |
| A. | partially filled pipeline |
| B. | pipe |
| C. | open channel |
| D. | river. |
| Answer» C. open channel | |
| 1361. |
For water, when the pressure increases, the viscosity |
| A. | also increases |
| B. | decreases |
| C. | remains constant |
| D. | first decreases, and then increases |
| Answer» E. | |
| 1362. |
One dimensional flow implies |
| A. | flow in a straight line. |
| B. | steady uniform flow. |
| C. | unsteady uniform flow. |
| D. | a flow which does not account for changes in transverse direction. |
| Answer» E. | |
| 1363. |
The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number. |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | may increase or decrease |
| Answer» C. remains same | |
| 1364. |
For an incompressible fluid, the bulk modulus of elasticity is |
| A. | 5 kg/m3 |
| B. | ‚àû N/m2 |
| C. | 1 N |
| D. | 0 N/m |
| Answer» C. 1 N | |
| 1365. |
Unsteady 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 increasing rate. |
| D. | expanding tube at constant rate. |
| Answer» C. expanding tube at increasing rate. | |
| 1366. |
In case of turbulent flow of fluid through a circular pipe, the |
| A. | mean flow velocity is about 0.5 times the maximum velocity. |
| B. | velocity profile becomes flatter and flatter with increasing Reynolds number. |
| C. | point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius). |
| D. | skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more. |
| Answer» E. | |
| 1367. |
Dimension of surface tension is(where, F = force, L = length) |
| A. | FL-1 |
| B. | F-1 . L |
| C. | F.L-2 |
| D. | F-2 . L |
| Answer» B. F-1 . L | |
| 1368. |
A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp. |
| A. | 1 |
| B. | 20363 |
| C. | 5.5 |
| D. | 20090 |
| Answer» B. 20363 | |
| 1369. |
The momentum correction factor for the velocity distribution of laminar flow is |
| A. | 1.3 |
| B. | 1.66 |
| C. | 2.5 |
| D. | none of these |
| Answer» E. | |
| 1370. |
The schedule number of a pipe is an indication of its |
| A. | size |
| B. | roughness |
| C. | material density |
| D. | wall thickness |
| Answer» E. | |
| 1371. |
The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1372. |
All pipes of a particular nominal size have the same |
| A. | inside diameter |
| B. | outside diameter |
| C. | thickness |
| D. | none of these |
| Answer» C. thickness | |
| 1373. |
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer. |
| A. | U-tube water. |
| B. | U-tube mercury. |
| C. | inclined tube mercury. |
| D. | inclined tube water. |
| Answer» E. | |
| 1374. |
A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump |
| A. | develops a lower head. |
| B. | capacity is reduced. |
| C. | requires more power. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1375. |
Hydraulic __________ works on the principle of Pascal's law of transmission of fluid pressure. |
| A. | press |
| B. | turbine |
| C. | pump |
| D. | coupling |
| Answer» B. turbine | |
| 1376. |
Acceleration head in a reciprocating pump |
| A. | increases the work done during delivery stroke. |
| B. | decreases the work done during suction stroke. |
| C. | does not change the work requirement of the pump. |
| D. | increases the work done during suction stroke. |
| Answer» D. increases the work done during suction stroke. | |
| 1377. |
A mixed flow centrifugal pump |
| A. | employs such an impeller, through which the flow is a combination of radial & axial flow. |
| B. | mixes the two fluids before pumping them. |
| C. | pumps the two fluids separately and then mixes them. |
| D. | employs impellers in both the radial & axial directions. |
| Answer» B. mixes the two fluids before pumping them. | |
| 1378. |
The dimension of surface tension is |
| A. | ML-2 |
| B. | MT-2 |
| C. | MLT-2 |
| D. | ML-2T |
| Answer» C. MLT-2 | |
| 1379. |
Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure. |
| A. | small differential |
| B. | atmospheric |
| C. | absolute |
| D. | gage |
| Answer» B. atmospheric | |
| 1380. |
The ratio of inertial forces to gravity forces is called the __________ number. |
| A. | Mach |
| B. | Froude |
| C. | Euler |
| D. | Weber |
| Answer» C. Euler | |
| 1381. |
The __________ pressure is measured by a static tube. |
| A. | dynamic |
| B. | static |
| C. | total |
| D. | none of these |
| Answer» C. total | |
| 1382. |
Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) |
| A. | d |
| B. | d1/3 |
| C. | d2 |
| D. | d2/3 |
| Answer» B. d1/3 | |
| 1383. |
Minimum fluidisation velocity for a specific system depends upon the |
| A. | particle size. |
| B. | fluid viscosity. |
| C. | density of both the particle & the fluid. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1384. |
Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.$ |
| A. | 40 |
| B. | 34 |
| C. | 8 |
| D. | 37 |
| Answer» D. 37 | |
| 1385. |
Weber number is the ratio of inertial force to __________ force. |
| A. | surface tension |
| B. | gravity |
| C. | viscous |
| D. | elastic |
| Answer» B. gravity | |
| 1386. |
Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss ? |
| A. | Flow nozzle |
| B. | Venturimeter |
| C. | Rotameter |
| D. | Orificemeter |
| Answer» C. Rotameter | |
| 1387. |
The ratio of pressure forces to inertial forces is called the __________ number. |
| A. | Froude |
| B. | Euler |
| C. | Reynold |
| D. | Mach |
| Answer» C. Reynold | |
| 1388. |
A mono pump is a __________ pump. |
| A. | centrifugal |
| B. | piston |
| C. | positive acting rotary |
| D. | a group of vacuum |
| Answer» D. a group of vacuum | |
| 1389. |
Navier-Stokes equation is useful in the analysis of __________ fluid flow problems. |
| A. | non-viscous |
| B. | viscous |
| C. | turbulent |
| D. | rotational |
| Answer» C. turbulent | |
| 1390. |
In case of venturimeters, friction losses are about __________ percent of maximum velocity head. |
| A. | 2 |
| B. | 8 |
| C. | 12 |
| D. | 20 |
| Answer» B. 8 | |
| 1391. |
Open channel liquid flow is most conveniently measured by a |
| A. | hot wire anemometer |
| B. | notch |
| C. | rotameter |
| D. | segmental orifice |
| Answer» C. rotameter | |
| 1392. |
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. |
| A. | NPSH required. |
| B. | BHP required by the pump. |
| C. | head of the liquid pumped. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1393. |
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 | |
| 1394. |
Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its |
| A. | inner diameter |
| B. | outer diameter |
| C. | thickness |
| D. | neither inner nor outer diameter |
| Answer» E. | |
| 1395. |
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the |
| A. | discharge. |
| B. | suction. |
| C. | suction minus vapor pressure of the liquid at suction temperature. |
| D. | discharge minus vapor pressure of the liquid at the discharge temperature. |
| Answer» D. discharge minus vapor pressure of the liquid at the discharge temperature. | |
| 1396. |
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¬∞ bend | |
| 1397. |
Enamels and paints are generally __________ fluid. |
| A. | reheopectic |
| B. | pseudo-plastic |
| C. | thixotropic |
| D. | dilatant |
| Answer» C. thixotropic | |
| 1398. |
Which of the following can be used for the direct measurement of volumetric flow rate of slurry ? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Rotameter |
| D. | Pitot tube |
| Answer» D. Pitot tube | |
| 1399. |
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. | |
| 1400. |
Velocity at a certain point in case of streamline flow is |
| A. | constant |
| B. | independent of time |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |