Chemical Engineering Online Basic Questions - Set 04 - ObjectiveBooks

Chemical Engineering Online Basic Questions - Set 04

Practice Test: Question Set - 04

1. Magnetic permeability of iron is increased by its
    (A) Decarburizing
    (B) Alloying with cobalt
    (C) Purification
    (D) Alternate heating & cooling

2. Temper brittleness of a material can be fairly detected by the __________ test.
    (A) Fatigue
    (B) Notched bar impact
    (C) Tensile
    (D) Hardness

3. The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
    (A) 3
    (B) 7
    (C) 11
    (D) 15

4. There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
    (A) One
    (B) Two
    (C) Three
    (D) None of these

5. Fibrous fracture is normally encountered in the __________ materials.
    (A) Hard
    (B) Elastic
    (C) Ductile
    (D) Brittle

6. Fire in fuel gas pipelines is extinguished most effectively by
    (A) Spraying water
    (B) Blanketting the area with nitrogen atmosphere
    (C) Fire fighting foam
    (D) None of these

7. Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
    (A) Manganese
    (B) Phosphorous
    (C) Magnesium
    (D) Chromium

8. Pick out the wrong statement.
    (A) A soft magnetic material should have high permeability and small area of hysteresis loop
    (B) Poisson's ratio of high melting point metals is more than unity
    (C) Solders generally melt at less than 185°C
    (D) Steel produced by B.O.F process is ideally suited for manufacturing flat product

9. In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.
    (A) μ , α and θ all have units of m/s
    (B) μ , α and θ all have units of m2/s
    (C) α and θ have units of m2/s, while μ has unit of m/s
    (D) α and θ have units of m/s, while μ has unit of m2/s

10. Drills are usually made of
    (A) Cermets
    (B) High speed steel
    (C) Alloy steel
    (D) Tungsten carbide

11. Shaft/rotor speed is most accurately measured by a
    (A) Frequency counter
    (B) Tachometer
    (C) Strobometer
    (D) Speedometer

12. Maraging steels derive their strength from the following mechanism:
    (A) A fine, highly dislocated and strong martensite
    (B) Fine dispersions of inter-metallic of Fe, Ni, Ti etc
    (C) Fine dispersions of alloy carbides in a ferrite matrix
    (D) Fine dispersions of Fe3 C nucleated on dislocations in austenite

13. Factor of safety is the ratio of the __________ stress to the working stress.
    (A) Tensile
    (B) Compressive
    (C) Yield
    (D) Bearing

14. In chemical dehumidification process
    (A) Wet bulb temperature increases
    (B) Dry bulb temperature remains constant
    (C) Dew point temperature increases
    (D) Dry bulb temperature increases

15. A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.
    (A) Neutral
    (B) Ideal
    (C) Buffer
    (D) Zero pH

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