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- Question
Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
Options- A. dilute HCI
- B. acetic acid
- C. concentrated H2SO4
- D. none of these
- Correct Answer
- acetic acid
- 1. The minimum baffle height should be
Options- A. equal to the impeller diameter.
- B. twice the impeller diameter.
- C. twice the tank diameter.
- D. 3/4 of the tank height. Discuss
- 2. Which of the following sugars is the sweetest?
Options- A. Glucose
- B. Fructose
- C. Sucrose
- D. Lactose Discuss
- 3. Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
Options- A. 50-80
- B. 250-400
- C. 1000-1200
- D. 800-900 Discuss
- 4. Most commonly used joint in the underground pipe lines is the
Options- A. sleevejoint
- B. coupling
- C. flange
- D. expansion joint Discuss
- 5. Which of the following is not a measure component necessarily to be present in fertilisers?
Options- A. Nitrogen
- B. Potassium
- C. Phosphorous
- D. Sulphur Discuss
- 6. 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
- 7. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is
Options- A. H2O > C2H5OH > CS2
- B. CS2 > C2H5OH > H2O
- C. H2O > CS2 > C2H5OH
- D. CS2 > H2O > C2H5OH Discuss
- 8. In the design of a shell and tube heat exchanger, the corrosion allowance
Options- A. need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
- B. for carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm.
- C. for internal cover and tube sheet is provided on both the sides.
- D. all (a), (b) & (c). Discuss
- 9. For an ideal gas, the compressibility factor
Options- A. decreases with pressure rise.
- B. is unity at all temperature.
- C. is unity at Boyle's temperature.
- D. zero. Discuss
- 10. If the discharge of a centrifugal pump is throttled, then its suction lift
Options- A. increases
- B. decreases
- C. remains unchanged
- D. data insufficient to predict Discuss
More questions
Correct Answer: twice the impeller diameter.
Correct Answer: Fructose
Correct Answer: 250-400
Correct Answer: sleevejoint
Correct Answer: Sulphur
Correct Answer: short (< 2 m) and housed indoor.
Correct Answer: H2O > C2H5OH > CS2
Correct Answer: all (a), (b) & (c).
Correct Answer: is unity at all temperature.
Correct Answer: increases
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