Process Equipment and Plant Design problems
- 1. Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ? = yield strength and E = modulus of elasticity)
Options- A. E
- B. ?
- C. ?/E
- D. E/? Discuss
Correct Answer: ?/E
- 2. Pick out the wrong statement.
Options- A. If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour.
- B. The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding.
- C. The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps.
- D. none of these. Discuss
Correct Answer: none of these.
- 3.
for a Tee (used as elbow, entering run) would be around
Options- A. 5
- B. 60
- C. 200
- D. 350 Discuss
Correct Answer: 60
- 4. A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
Options- A. 19
- B. 38
- C. 76
- D. 95 Discuss
Correct Answer: 38
- 5. The distance between the centre of a rivet hole to the nearest edge of the plate is called
Options- A. pitch
- B. margin
- C. back pitch
- D. none of these Discuss
Correct Answer: margin
- 6. Vertical storage vessels are never supported by __________ support.
Options- A. bracket
- B. saddle
- C. skirt
- D. lug Discuss
Correct Answer: saddle
- 7. Power required for agitation depends upon the
Options- A. height & properties of the liquid.
- B. agitator type & speed of agitation.
- C. size of agitator & the tank.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 8. Wind load consideration in the design of a support can be neglected, when the vessel is
Options- A. tall (say 30 metres), but is full of liquid.
- B. tall but empty.
- C. short (< 2 m) and housed indoor.
- D. none of these. Discuss
Correct Answer: short (< 2 m) and housed indoor.
- 9. Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always
Options- A. less than arithmetic mean value.
- B. more than arithmetic mean value.
- C. more than geometric mean value.
- D. both(b) & (c). Discuss
Correct Answer: less than arithmetic mean value.
- 10. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.
Options- A. 6% of I.D.
- B. 3 times the thickness
- C. either (a) or (b), whichever is larger
- D. either (a) or (b), whichever is smaller Discuss
Correct Answer: either (a) or (b), whichever is larger
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