chemical engineering MCQs – Page 308

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 Review each marked answer and report any item that may be outdated or unclear.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
6141. To resist spalling tendency, a refractory should have________________?
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A. Low specific heat

B. All A., B. and C.

C. Low thermal co-efficient of expansion

D. Greater diffusivity

6142. Fluid resistance to shear depends upon its_______________?
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A. Rate of transfer of molecular momentum

B. Cohesion

C. Both A. and B.

D. Neither A. nor B.

6143. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?
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A. Washing action of metal

B. Corrosion by layer of slag

C. Both A. & B.

D. Neither A. nor B.

6144. The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is _______________ the mean velocity of flow?
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A. Inversely proportional to

B. Directly proportional to square of

C. Inversely proportional to square of

D. Directly proportional to

6145. For a given fluid flow rate, which of the following incurs maximum head loss ?
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A. Orificemeter

B. Venturimeter

C. All of them incur the same head loss

D. Flow nozzle

6146. Centrifugal pumps as compared to reciprocating pumps__________________?
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A. Can be run with discharge line valve closed for a short interval

B. Deliver fluid with pulsating/fluctuating discharge

C. Do not need priming

D. Run at a lower speed for the same discharge

6147. The boundary layer thickness at a given section along a flat plate _____________ with increasing Reynolds number?
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A. Remain same

B. Increases

C. Decreases

D. May increase or decrease

6148. Dolomite bricks have good resistance to attack by_____________________?
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A. None of these

B. Lime slag

C. Molten steel

D. Iron oxide

6149. Which of the following is not a high alumina refractory material ?
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A. Periclase

B. Kyanite

C. Diaspore

D. Sillimanite

6150. Highest melting (m.p = 3070C) oxide refractory is__________________?
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A. Zirconia

B. Thoria

C. Alumina

D. Magnesia

6151. Function of air vessel provided in a reciprocating pump is to_________________?
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A. Reduce the danger of cavitation

B. Reduce discharge fluctuation

C. Increase the pump efficiency

D. Avoid the necessity of priming

6152. Periclase refractory contains mainly________________?
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A. CaO

B. MgO

C. Al2O3

D. SiO2

6153. Fireclay bricks is not used for lining the__________________?
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A. Roof of open hearth furnace

B. Gas producer

C. Bottom of hot metal mixer

D. Cupola

6154. The blades of a centrifugal impeller are said to be curved forward, if the ____________ of the motion of impeller blades?
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A. Inlet tip of a blade curves in a direction opposite to that

B. Outlet tip of a blade curves in a direction opposite to that

C. Inlet tip of a blade is towards the direction

D. Outlet tip of a blade is towards the direction
6155. Low specific speed of a pump implies that, it is a/an ______________ pump?
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A. Mixed flow

B. Centrifugal

C. None of these

D. Axial flow

6156. Fireclay bricks are used in the___________________?
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A. Furnaces allowed to cool frequently

B. Chimney linings

C. Flues

D. All A., B. and C.
6157. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is___________________?
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A. 5

B. 28.2

C. 56.22

D. 14.1

6158. With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) ?
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A. Decreases

B. Increases linearly

C. Remain constant

D. Increases exponentially

6159. Cermets are____________________?
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A. Composite material containing both ceramic & metallic constituents

B. Having high strength & resistance to high temperature

C. Used in space vehicles, missiles & nuclear energy plants

D. All A., B. and C.
6160. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ C for 24 hours?
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A. 1600

B. 1000

C. 700

D. 2000