chemical engineering MCQs – Page 333

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 Review each marked answer and report any item that may be outdated or unclear.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
6641. The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?
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A. Square of the difference in specific weights of solid & fluid

B. First power of its diameter

C. Inverse of the fluid viscosity

D. Inverse square of the diameter

6642. Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ?
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A. ML-1T-3, F-1L2T

B. F-1L2T-1, MLT-3

C. FL-2T, ML-1T-1

D. FLT, ML-1T-1

6643. Foot valves provided in pumps are ____________ valves?
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A. Pressure reducing

B. Directional control

C. Relief

D. Three/four way

6644. Reynolds number is the ratio of____________________?
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A. Inertial forces to viscous forces

B. Viscous forces to gravity forces

C. Inertial forces to gravity forces

D. Viscous forces to inertial forces

6645. 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. 20 KPa

B. 10 KPa

C. 30 KPa

D. 40 KPa

6646. Capacity of a hydraulic accumulator is defined in terms of maximum_____________________?
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A. Flow rate through accumulator

B. Amount of energy stored

C. Volume available in the cylinder

D. Rate of falling of ram

6647. Centrifugal pump is normally classified on the basis of the________________?
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A. Impeller blade angle

B. rpm

C. Number of blades in impeller

D. Type of casing
6648. With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the____________________?
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A. Velocity increases

B. Pressure decreases

C. Both A. & B.

D. Neither A. nor B.

6649. A fluid is a substance, that_________________?
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A. Has zero shear stress

B. Flows when even a small shear is applied to it

C. Is almost incompressible

D. Has to be kept in a closed container

6650. Check valves are used_______________?
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A. For controlling water flow

B. For unidirectional flow

C. In bends

D. At high pressure

6651. For ideally incompressible fluid, the Mach number will be __________________?
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A. 1.5

B. 5

C. 1

D. 0

6652. The equation f-0.5 = 4.07 loge (NRe ?f)-0.6 is called the ____________?
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A. Von-Karman equation

B. Colebrook formula

C. None of these

D. Fanning equation

6653. 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. 42

B. 325

C. 269

D. 26

6654. Boundary layer separation occurs when the____________________?
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A. Velocity of sound is reached

B. Valve is closed in a pipeline

C. Cross-section of the channel is reduced

D. Pressure reaches a minimum

6655. Check in a centrifugal pump is________________?
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A. Provided in the discharge line

B. Generally a globe valve

C. Provided to prevent liquid from backing up through the pump when the pump is turned off or

D. All A., B. and C.

E. idently stops running

6656. The line of action of the buoyant force passes through the centre of gravity of the_______________________?
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A. Submerged body

B. Volume of fluid vertically above the body

C. Displaced volume of the fluid

D. Horizontal projection of the body

6657. The dimension of kinematic viscosity is_________________?
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A. ML-2T-2

B. ML-2T-1

C. None of these

D. L2T-1
6658. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?
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A. Volumetric

B. Mechanical

C. Overall

D. Manometric
6659. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is_________________?
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A. 0.3

B. 0.9

C. 0.03

D. 0.66

6660. Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an _____________ manometer?
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A. Inclined tube mercury

B. U-tube water

C. U-tube mercury

D. Inclined tube water