Chemical Engineering MCQ pdf - Set 43 - ObjectiveBooks

Chemical Engineering MCQ pdf - Set 43

Practice Test: Question Set - 43

1. Increasing the carbon content of steel
    (A) Reduces the upper shelf energy
    (B) Increasing the ductility transition temperature
    (C) Decreases brittleness
    (D) Decreases hardness

2. Spark plug is provided in a/an
    (A) Engine having carburetor
    (B) Diesel engine
    (C) Compression ignition engine
    (D) Both (b) & (c)

3. Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
    (A) Sorbite
    (B) Bainite
    (C) Martensite
    (D) Troostite

4. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
    (A) 370
    (B) 340
    (C) 320
    (D) 300

5. What is the percentage of chromium in 18-4-1 high speed steel?
    (A) 1
    (B) 4
    (C) 18
    (D) 23

6. With decrease in the grain size of a material, its creep resistance
    (A) Increases
    (B) Decreases
    (C) Remain constant
    (D) Either (a) or (b); depends on the material

7. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
    (A) 250
    (B) 500
    (C) 1000
    (D) 3000

8. An oxidation process is accompanied with decrease in the
    (A) Number of electrons
    (B) Oxidation number
    (C) Number of ions
    (D) All (a), (b) & (c)

9. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.
    (A) 20
    (B) 60
    (C) 120

10. Consumable electrodes are used in the __________ welding.
    (A) Gas
    (B) Arc
    (C) Thermit
    (D) Resistance

11. Dislocation cross-slip is difficult in those materials, which have
    (A) Large number of slip systems
    (B) High work hardening rate
    (C) Coarse grain size
    (D) Low stacking fault energy

12. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
    (A) Is as light as possible
    (B) Has very high C.O.P.
    (C) Employs minimum quantity of refrigerant
    (D) Consumer minimum horse power

13. Cold chisel & hammers are made of
    (A) High speed steel
    (B) High carbon steel
    (C) Forged steel
    (D) Mild steel

14. Dew point temperature always gives an indication of the __________ of the moist air.
    (A) Dryness
    (B) Moisture content
    (C) Coolness
    (D) Latent heat

15. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?
    (A) E = 2G (1 + v)
    (B) E = G (1 + v)
    (C) E = G (1 + v)/2
    (D) E = 2G (1 + 2v)

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