chemical engineering MCQs – Page 330

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 Review each marked answer and report any item that may be outdated or unclear.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
6581. A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is _____________ hp?
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A. Oct-55

B. 1

C. Jan-55

D. 5.5

6582. For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance d measured from the wall of the pipe and the friction velocity v, and it follows a _____________ relationship?
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A. Logarithmic

B. Hyperbolic

C. Linear

D. Parabolic

6583. Pitot tube measures the ______________ of a fluid?
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A. Average velocity

B. Average flow rate

C. Pressure

D. Point velocity
6584. What causes cavitation in centrifugal pump ?
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A. Low suction pressure

B. High suction pressure

C. Low barometric pressure

D. High suction velocity

6585. Nature of fluid flow during the opening of a valve in a pipeline is_________________?
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A. Laminar

B. Unsteady

C. Uniform

D. Steady</strong>

6586. Dimension of absolute viscosity is_________________?
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A. MLT

B. ML-1T-1

C. MLT-1

D. ML-1T

6587. _____________ forces act on a particle moving through a stationary fluid?
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A. Gravity

B. All A., B., & C.

C. Buoyant

D. Drag

6588. Acceleration head in a reciprocating pump_______________________?
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A. Increases the work done during delivery stroke

B. Increases the work done during suction stroke

C. Decreases the work done during suction stroke

D. Does not change the work requirement of the pump
6589. The resistance wire used in a hot wire anemometer for conducting electrical current is made of__________________?
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A. Tungsten

B. Chromium

C. Copper

D. Aluminium

6590. The centre of pressure is_________________?
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A. A point on the line of action of the resultant force

B. Always below the centroid of the area

C. At the centroid of the submerged area

D. Always above the centroid of the area

6591. The specific speed of a pump is defined as the speed of a unit of such a size, that it__________________?
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A. Delivers unit discharge at unit head

B. Requires unit power for unit head

C. None of these

D. Delivers unit discharge at unit power

6592. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?
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A. Decrease

B. Increase

C. Remain constant

D. Either A. or B.; depends on other factors

6593. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature) ?
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A. ?T

B. T

C. 1/T

D. 1/?T

6594. What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?
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A. Penstock

B. Tunnel

C. Siphon

D. Pressure pipeline

6595. Surge tanks are provided in high pressure water pipelines to___________________?
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A. None of these

B. Facilitate easy dismantling of pipeline for cleaning and maintenance

C. Reduce the water hammer

D. Store a definite quantity of water all the time

6596. The maximum delivery pressure of compressors can be upto _____________ atmospheres?
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A. 250

B. 10

C. 100

D. 1000
6597. For flow of fluids through packed bed, the superficial velocity is_________________?
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A. Same as the average velocity through channels

B. Less than the average velocity through channels

C. More than the average velocity through channels

D. Dependent on the pressure drop across the bed

6598. Drag force acting on a body does not depend upon the____________________?
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A. Projected area of the body

B. Velocity of the body

C. Density of the body

D. Density of the fluid

6599. The terminal velocity of a particle moving through a fluid varies as dp n. What is the value of n for Newtons law regime ?
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A. 1

B. 0.5

C. 1.5

D. 3

6600. In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?
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A. Everywhere in the transition zone

B. When the friction factor is independent of the Reynolds number

C. When the roughness projections are much smaller than the thickness of the laminar film

D. In the zone of complete turbulence