chemical engineering Mcqs
6551. Which of the following is a dimensionless parameter ?
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A. Kinematic viscosity

B. None of these

C. Specific weight

D. Angular velocity

6552. Which of the following is the Blasius equation?, relating friction factor to the Reynolds number ?
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A. f = 0.079.NRe-0.25

B. f-0.5 = 4.07 loge (NRef)-0.6

C. Both a and b

D. None of these

6554. Mercury is an ideal barometric fluid mainly due to its __________________?
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A. High density

B. Low compressibility

C. Low capillary action

D. Very low vapor pressure
6555. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?
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A. Inversely as gas density

B. Directly as square of gas density

C. Directly as gas density

D. Directly as square root of gas density

6559. All pipes of a particular nominal size have the same_________________?
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A. Outside diameter

B. Thickness

C. None of these

D. Inside diameter

6560. The continuity equation__________________?
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A. None of these

B. Relates work and energy

C. Stipulates that Newtons second law of motion must be satisfied at every point in the fluid

D. Relates mass flow rate along a stream tube
6564. Purpose of hydraulic accumulator is to_______________?
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A. Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

B. Accumulate pressure to increase force

C. Ensure intermittent supply of hydraulic pressure

D. Increase the pressure and store/ accumulate it

6567. The capacity of an accumulator is the maximum_________________?
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A. Liquid which it can store

B. Discharge which it can deliver

C. None of these

D. Energy which it can store
6570. Speed of sound in an ideal gas depends on its________________?
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A. Pressure

B. None of these

C. Temperature

D. Specific volume

6571. Eulers equation of motion states, that at every point, the_________________?
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A. Fluid momentum is constant

B. Rate of mass outflow is equal to the rate of mass inflow

C. Force per unit mass equals acceleration

D. None of these

6572. The pitot static tube does not measure the _____________ pressure?
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A. Total

B. Difference in static & dynamic

C. All A., B. and C.

D. Static

6574. Which of the following may be termed as a variable orifice flow-meter ?
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A. Pitot tube

B. Rotameter

C. All A., B. and C.

D. V-notch

6576. At a constant speed of the centrifugal pump, it?s _____________ the impeller diameter?
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A. Capacity varies directly with

B. Head varies as the square of

C. All A., B. and C.

D. Horsepower varies as the cube of

6579. Which of the following has the minimum compressibility ?
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A. Nitrogen at room temperature

B. Air at room temperature

C. Water at room temperature

D. Oxygen at room temperature

6580. Hydraulic intensifier is used for increasing the ___________________?
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A. Intensity of pressure of the liquid

B. Rate of velocity of liquid supply

C. Momentum rate through delivery pipe

D. Rate of flow through delivery pipeline of a pump

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

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
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

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

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

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