Basic Chemical Engineering Questions - Set 31 - ObjectiveBooks

Basic Chemical Engineering Questions - Set 31

Practice Test: Question Set - 31

1. At 100% relative humidity, the dew point temperature of moist air is
    (A) Less than the wet bulb temperature
    (B) More than the wet bulb temperature
    (C) Equal to the wet bulb temperature
    (D) Equal to the ambient temperature

2. Dry saturated steam can be converted into superheated steam by
    (A) Increasing its cross-sectional area of flow
    (B) Passing it through a pressure reducing valve
    (C) Forcing it downwards through a vertical tube
    (D) None of these

3. __________ of hard alloy and tool steel is done to make it easily machinable.
    (A) Case carburizing
    (B) Tempering
    (C) Normalizing
    (D) Annealing

4. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?
    (A) Nitrogen oxides
    (B) Hydrocarbons
    (C) Both 'a' & 'b'
    (D) Carbon monoxide

5. In the Bayer's process, bauxite is digested under pressure using
    (A) H2SO4
    (B) NaOH
    (C) NH3
    (D) HCl

6. Dielectric
    (A) Is an electrical insulating material
    (B) Of low resistivity is preferred
    (C) Should have high thermal conductivity
    (D) Need not defy the corrosive action of chemicals

7. Closeness of packing is maximum in case of __________ crystal lattice.
    (A) Face centered
    (B) Simple cubic
    (C) Body centered
    (D) None of these

8. Enzymes belong to the category of
    (A) Proteins
    (B) Carbohydrates
    (C) Vitamins
    (D) Fats

9. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?
    (A) Temperature - entropy
    (B) Temperature - pressure
    (C) Enthalpy - entropy
    (D) Enthalpy-pressure

10. According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.
    (A) 0.5
    (B) 2
    (C) √2
    (D) √3/2

11. Brittleness induced due to the presence of sulphur in steel can be reduced by adding
    (A) Manganese
    (B) Magnesium
    (C) Vanadium
    (D) Copper

12. Rankine cycle comprises of two isothermal and two __________ processes.
    (A) Isobaric
    (B) Polytropic
    (C) Isentropic
    (D) None of these

13. The hardenability of steel decreases with
    (A) Decrease in dislocation density
    (B) Increase in solutionising temperature
    (C) Increase in strength
    (D) Decrease in grain size

14. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?
    (A) Enthalpy
    (B) Relative humidity
    (C) Wet bulb temperature
    (D) Dew point temperature

15. Diamagnetic materials
    (A) Are magnetized by eddy currents only
    (B) Are non-magnetic and cannot be magnetized
    (C) Are magnetized in direction opposite to the magnetic field
    (D) Can be magnetized in one direction only

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