Basic Questions for Chemical Engineering - Set 22 - ObjectiveBooks

Basic Questions for Chemical Engineering - Set 22

Practice Test: Question Set - 22


1. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.
    (A) 0.001
    (B) 0.01
    (C) 0.002
    (D) 0.02

2. Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
    (A) Cementite
    (B) Austenite
    (C) Martensite
    (D) Pearlite

3. Pick out the wrong statement.
    (A) Both annealing and normalizing release the internal stresses of the material besides improving the mechanical properties
    (B) Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburizing, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness
    (C) Induction hardening and flame hardening techniques are also used for surface hardening
    (D) Martempering of a material is a hardening process

4. Which of the following is not a charge material for cupola?
    (A) Limestone
    (B) Iron scrap
    (C) Iron ore
    (D) Pig iron

5. Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
    (A) 10-3
    (B) 103
    (C) 10-15
    (D) 1015

6. With increase in steam pressure, its specific volume decreases
    (A) Rapidly first and then slowly
    (B) Linearly
    (C) Slowly first and then rapidly
    (D) Exponentially

7. Maximum hardenability of steel depends upon its
    (A) Chemical composition
    (B) Carbon content
    (C) Grain size
    (D) Alloying elements content

8. Sudden fall of atmospheric pressure by a large amount is an indication of the
    (A) Rain
    (B) Cold wave
    (C) Storm
    (D) Fair weather

9. Angular displacement can be measured suitably by a
    (A) Shaft encoder
    (B) Linear variable differential transducer (LVDT)
    (C) Stroboscope
    (D) Tachometer

10. __________ of grey cast iron produces white cast iron.
    (A) Tempering
    (B) Rapid heating
    (C) Rapid cooling
    (D) Slow cooling

11. Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
    (A) Gr0.25Gr
    (B) Gr0.25Gr0.33
    (C) GrGr0.25
    (D) Gr0.33Gr0.25

12. Stainless steel is welded with difficulty because of
    (A) Its high melting temperature
    (B) Chances of cracking
    (C) Oxide film formation
    (D) Chromium carbide formation

13. Titanium is added to molten aluminium alloys before casting for the purpose of
    (A) Grain refinement
    (B) Increasing corrosion resistance
    (C) Reducing porosity
    (D) Improving fluidity

14. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
    (A) Hard
    (B) Soft
    (C) Silicon carbide
    (D) Aluminium oxide

15. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3.
    (A) 0.5
    (B) 1
    (C) 1/3
    (D) 2.5

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