Chemical Engineering Basics MCQs - Set 11 - ObjectiveBooks

Chemical Engineering Basics MCQs - Set 11

Practice Test: Question Set - 11

1. Boiler tube size is specified by its thickness and __________ diameter.
    (A) Outside
    (B) Inside
    (C) Mean
    (D) None of these

2. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
    (A) More
    (B) Less
    (C) Equal
    (D) Much more

3. The rolling process cannot be used to produce
    (A) Plates
    (B) Rods
    (C) Tubes
    (D) Wires

4. At the point of boundary layer separation in fluid flow, the
    (A) Shear stress is maximum
    (B) Velocity gradient is flat
    (C) Density variation is maximum
    (D) Shear stress is zero

5. In "Imperial Smelting Process" for extraction of zinc, zinc vapor thus produced is quenched in the external condenser by the use of the following:
    (A) Jet of water at high pressure
    (B) Blast of air
    (C) Mixture of water and air
    (D) Rain of molten lead

6. _________ flux is used for the extraction of metal from its self fluxing ores.
    (A) No
    (B) Acid
    (C) Basic
    (D) Neutral

7. The most suitable material of construction for a sewer to carry sewage under high pressure is
    (A) Asbestos cement
    (B) Steel
    (C) Cement concrete
    (D) Stoneware

8. Uniform ramming of sand in green sand moulding process leads to
    (A) Reduced chance of gas porosity
    (B) Greater dimensional stability of the casting
    (C) Uniform flow of molten metal into the mould cavity
    (D) Less sand expansion type of casting defect

9. Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about
    (A) 1
    (B) 10
    (C) 25
    (D) 50

10. Which of the following is not a dielectric material?
    (A) Cotton, silk and paper
    (B) Asbestos, glass, porcelain and mica
    (C) Rubber and polymeric resins
    (D) All refractory materials

11. During decarburizing of a plain carbon steel, the thickness of ferrite layer growth is proportional to
    (A) Time
    (B) Square root of time
    (C) Square of time
    (D) Cube of time

12. Particle nature of cathode rays is proved due to the fact that they
    (A) Travel in a straight line
    (B) Get deflected by magnetic electric field
    (C) Produce fluorescence
    (D) Heat the exposed material

13. Property responsible for the talcum powder to cling to the skin is the
    (A) Capillary action
    (B) Adhesion
    (C) Cohesion
    (D) Surface tension

14. Which of the following is prone to cup and cone fracture?
    (A) Cast iron
    (B) Soft brass
    (C) Round specimen of ductile metal
    (D) Flat tensile specimen of ductile metal

15. Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
    (A) Only
    (B) Plus variable cost
    (C) Plus overhead cost
    (D) Plus selling expenses

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