chemical engineering MCQs – Page 319

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
6361. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?
comments icon0
A. 0.44

B. 0.24

C. 24

D. 24000

6362. A rectangular surface 3? 4?, has the lower 3 edge horizontal and 6? below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?
comments icon0
A. 48y

B. 39.6y

C. 58y

D. 49.2y

6363. Centrifugal compressors compared to reciprocating compressors__________________?
comments icon0

A. Have lower operating costs

B. Have quieter operation

C. All A., B. and C.

D. Require less space

6364. Centrifugal pump cant be used to pump _____________________?
comments icon0

A. Moderately viscous vegetable oil used in soap industry

B. Thick molten soap at 80C

C. None of the above

D. Molten sodium (used as a coolant in Fast Breeder Reactor)

6365. The pressure and power requirement of a gas fan at constant speed & capacity varies ____________ the gas density?
comments icon0
A. Directly as

B. As square of

C. Inversely as

D. Inversely as square root of

6366. Hot wire anemometer is used to measure the_________________?
comments icon0
A. Velocity of gases

B. Pressure of liquids

C. Temperature of liquids

D. Velocity of liquids

6367. The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet ?
comments icon0

A. P, Rand S

B. P, Q and R

C. P and R

D. R and S

6368. With increase in pump speed, its NPSH requirement_________________?
comments icon0

A. Decreases

B. Increases

C. Can either increase or decrease; depends on other factors

D. Remains unaltered

6369. A Venturimeter measures the___________________?
comments icon0

A. Pressure

B. Point velocity

C. None of these

D. Velocity head

6370. Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?
comments icon0

A. Two

B. Three

C. Four

D. Eight

6371. In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________?
comments icon0

A. Area through which fluid flows does not vary

B. Pressure drop is almost constant

C. None of these

D. Pressure drop increases linearly

6372. One dimensional flow implies________________________?
comments icon0
A. A flow which does not account for changes in transverse direction

B. Unsteady uniform flow

C. Steady uniform flow

D. Flow in a straight line

6373. The head developed by a centrifugal pump is largely determined by the____________________?
comments icon0

A. Vapour pressure of the liquid

B. Angle of the vanes and the speed of the tip of the impeller

C. Nature of the liquid being pumped

D. Power of the pump

6374. The range of a particular Rotameter can be increased by__________________?
comments icon0

A. Decreasing the diameter of the float

B. Use of floats of different densities

C. No means

D. Increasing the diameter of the float

6375. Bernoullis equation for steady, frictionless, continuous flow states that the ______________ at all sections is same?
comments icon0

A. None of these

B. Velocity head

C. Total energy

D. Total pressure

6376. Kinetic energy of fluid per unit weight represented by the velocity head is given by___________________?
comments icon0
A. v2/2gc

B. 2v2/gc

C. ?.v2/2gc

D. ?v2/gc

6377. Diaphragm pumps are used to transport_________________?
comments icon0

A. Solids

B. Slurries

C. Fluids

D. Liquids

6378. With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss_______________?
comments icon0
A. Remain constant

B. Increases

C. Increases linearly

D. Decreases

6379. Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid?
comments icon0

A. 100 to 1000

B. 0.01 to 0.10

C. 2 to 3

D. 200 to 300

6380. For the same terminal conditions and fitting size, the least friction loss is incurred in a/an ?
comments icon0

A. 90bend

B. 45 elbow

C. Union

D. T-joint