Chemical Engineering Basic Questions and Answers - Set 21 - ObjectiveBooks

Chemical Engineering Basic Questions and Answers - Set 21

Practice Test: Question Set - 21

1. Runge-Kutta method is used to solve a/an
    (A) Ordinary differential equation of nth order
    (B) Simultaneous non-linear equation
    (C) Linear differential equation
    (D) None of these

2. Which of the following fastening devices has a head at one end and a nut fitted to the other?
    (A) Bolt
    (B) Stud
    (C) Top bolt
    (D) None of these

3. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
    (A) Working
    (B) Bearing
    (C) Yield
    (D) None of these

4. __________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.
    (A) Stellite
    (B) High speed steel
    (C) Cermet
    (D) Alnico

5. Chromium molybdenum steel cannot be welded using __________ welding.
    (A) Thermit
    (B) Electrical resistance
    (C) Oxy-acetylene
    (D) Any of these

6. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
    (A) 0.2
    (B) 0.4
    (C) 0.6
    (D) 0.8

7. Nitriding of a steel part does not increase its
    (A) Grain size
    (B) Fatigue limit
    (C) Surface hardness
    (D) Wear resistance

8. Which one of the following is incombustible?
    (A) H2
    (B) CCl4
    (C) C2H2
    (D) S

9. Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Both 'a' & 'b'

10. As the fluid flow rate increases, the float of the Rotameter
    (A) Rises in the tube
    (B) Rotates at higher speed
    (C) Rotates at lower speed
    (D) Drops down in the tube

11. Evaporative cooling process employs a combination of cooling and humidification in which the
    (A) Sensible heat is added
    (B) Sensible heat is removed and the latent heat is added
    (C) Latent heat is removed
    (D) Sensible heat is added and latent heat is removed

12. High speed steel tools retain their hardness upto a temperature of __________ °C.
    (A) 500
    (B) 750
    (C) 900
    (D) 1100

13. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
    (A) Tempering
    (B) Hardening
    (C) Annealing
    (D) Normalizing

14. Pick out the wrong statement.
    (A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
    (B) Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
    (C) Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
    (D) Tungsten steel and alnico are not hard magnetic materials

15. The elastic strain in copper is due to the
    (A) Motion of dislocations
    (B) Stretching of atomic bonds
    (C) Breakage of atomic bonds
    (D) None of the above

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