chemical engineering MCQs – Page 309

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 Review each marked answer and report any item that may be outdated or unclear.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
6161. Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?
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A. At the hearth bottom of the furnace on which stock is placed

B. None of these

C. Used in the roof of the furnace

D. Used for furnace insulation

6162. Spray test determines the _____________ of refractories?
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A. Resistance to slag penetration

B. Resistance to CO attack

C. Permanent linear change

D. RUL

6163. Fireclay refractories have __________________?
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A. Low co-efficient of thermal expansion

B. Very high cost

C. Poor thermal spalling resistance

D. Tendency to expand unduly high during firing

6164. The ______________ pressure is measured by a static tube?
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A. None of these

B. Dynamic

C. Static

D. Total

6165. Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?
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A. Neutral

B. Oxidising

C. Either A. or B.

D. Neither A. nor B.

6166. A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be __________ litres/minute ?
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A. 200

B. 750

C. 1000

D. 500
6167. Bottom of basic open hearth furnace are constructed of__________________?
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A. Dead burnt magnesite ramming mass

B. Porous fireclay bricks

C. Silicon carbide bricks

D. Semi-silica bricks

6168. A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is _____________ litres?
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A. 60

B. 660

C. 1.1

D. 600

6169. Refractory bricks with lower permeability is produced by using __________________?
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A. Finer grog size

B. Higher moulding pressure

C. All A., B. and C.

D. Higher firing temperature

6170. What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter D & length L incurring a pressure drop ?p with average velocity Vavg ?
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A. 4 Vavg/D

B. 8 Vavg/D

C. D ?p/4L

D. D ?p/8L

6171. ______________ bricks should not be used in oxidising atmosphere?
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A. Tar dolomite

B. Silica

C. Fireclay

D. Carbon
6172. Drag co-efficient for flow past immersed body is the ratio of _____________ to the product of velocity head and density?
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A. Shear force

B. Average drag per unit projected area

C. None of these

D. Shear stress

6173. Crushing strength of a refractory____________________?
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A. Decreases with increase in porosity

B. Increases with rise in service temperature

C. Is unaffected with change in service temperature

D. Decreases with rise in service temperature
6174. The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop of _____________ fluid?
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A. Pseudo-plastic

B. Bingham plastic

C. Newtonian

D. Dilatent
6175. Presence of MgO in alumino-silicate refractories _______________ its refractoriness?
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A. Either A. or B.; depends on its quantity

B. Lowers

C. Increases

D. Does not affect

6176. Transition length for a turbulent fluid entering into a pipe is around _____________ times the pipe diameter?
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A. 5

B. 5000

C. 50

D. 500

6177. Outer combustion chamber of blast furnace stove is lined with _____________ bricks?
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A. Fireclay

B. Zirconia

C. Silica

D. Chrome magnesite

6178. What is the value of q for saturated liquid feed to a distillation column ?
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A. <1

B. 1

C. >1

D. 0

6179. In parallel pipe problems, the__________________?
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A. None of these

B. Total head loss is equal to the sum of the head losses through each pipe

C. Discharge is the same through all the pipes

D. Head loss is the same through each pipe
6180. Which one contains minimum percentage of SiO2 ?
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A. Aluminous firebrick

B. Semi-silica

C. Firebrick

D. Sillimanite