Solved Examples in Chemical Engineering - Set 37 - ObjectiveBooks

Solved Examples in Chemical Engineering - Set 37

Practice Test: Question Set - 37

1. Transformer cores are normally made from
    (A) Soft ferrites
    (B) High purity iron
    (C) Grain oriented Fe-Si alloy
    (D) Al-Ni-Co alloy

2. As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 meters from the source of noise.
    (A) 110
    (B) 85
    (C) 60
    (D) 45

3. Non-ferrous alloys used for making cutting tools need not have high
    (A) Abrasion resistance
    (B) Toughness
    (C) Red hardness
    (D) Cutting speed

4. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
    (A) Same
    (B) Slightly less
    (C) Slightly more
    (D) Much more

5. Coating provided on the electrodes used in the arc welding is not expected to
    (A) Add alloying elements
    (B) Prevent electrode from contamination
    (C) Stabilize the arc
    (D) Provide protective atmosphere to weld

6. The trace metal present in insulin is
    (A) Cu
    (B) Zn
    (C) Fe
    (D) Ni

7. The type of pump used for lifting large quantity of sewage is a __________ pump.
    (A) Gear
    (B) Centrifugal
    (C) Reciprocating
    (D) Plunger

8. For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
    (A) Linearly
    (B) Exponentially
    (C) Logarithmically
    (D) Inversely

9. Thermal conductivity of a material does not depend upon its
    (A) Mass
    (B) Volume
    (C) Surface area
    (D) All 'a', 'b' & 'c'

10. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.
    (A) 5 to 10
    (B) 15 to 25
    (C) 45 to 50
    (D) 75 to 80

11. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
    (A) Evaporative capacity
    (B) Evaporation efficiency
    (C) Thermal efficiency
    (D) Steam load

12. Globular form of cementite is formed during the __________ process.
    (A) Spheroidising
    (B) Hardening
    (C) Annealing
    (D) Normalizing

13. The excess air required for the combustion of pulverized coal is of the order of about __________ percent.
    (A) 5
    (B) 15
    (C) 30
    (D) 45

14. The burnout heat flux in the nucleate boiling regime is not a function of the
    (A) Liquid density
    (B) Vapor density
    (C) Temperature difference
    (D) Heat of evaporation

15. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
    (A) Forging
    (B) Cold rolling
    (C) Hot rolling
    (D) Casting

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