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- Question
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
Options- A. at time zero.
- B. at the end of filtration.
- C. when half the filtrate has been obtained.
- D. at the end of filtration, but decreases with time subsequently.
- Correct Answer
- at the end of filtration.
- 1. Overall distillation column efficiency for most of the refinery columns can be given by (for ? = 0.07 - 1.4 cp and relative volatility < 4) (where ? = overall column efficiency, % ? = molal average viscosity of feed at average column temperature and pressure, cp ?p = pressure drop per tray, psi)
Options- A. ? = 17 - 61.1 log ?
- B.
- C. ? = 1.66 - 0.25 log ?
- D. ? = 0.25 log ? - 1.67 Discuss
- 2. The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately
Options- A. 0.07
- B. 0.09
- C. 0.11
- D. 0.13 Discuss
- 3. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Options- A. caking index.
- B. yield of carbonised products.
- C. friability & oxygen content.
- D. calorific value. Discuss
- 4. Which is the stable form of silica between 1470°C and the melting point 1713°C?
Options- A. Cristobalite
- B. Tridymite
- C. Quartz
- D. None of these Discuss
- 5. A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult's Law.
Options- A. positive
- B. negative
- C. no
- D. none of these Discuss
- 6. Which of the following additives are added to plastics to make it impervious to X-rays?
Options- A. Asbestos
- B. Barium salt
- C. Carborundum
- D. Phthalic acid Discuss
- 7. The ratio of lateral strain to linear strain is termed as the
Options- A. Poisson's ratio
- B. bulk modulus
- C. modulus of elasticity
- D. shear modulus Discuss
- 8. Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
Options- A. isothermal
- B. adiabatic
- C. isentropic
- D. none of these Discuss
- 9. During Joule-Thomson expansion of gases
Options- A. enthalpy remains constant.
- B. entropy remains constant.
- C. temperature remains constant.
- D. none of these. Discuss
- 10. Gross & net calorific value is the same for
Options- A. blast furnace gas
- B. coke oven gas
- C. L.D. converter gas
- D. none of these Discuss
More questions
Correct Answer: ? = 17 - 61.1 log ?
Correct Answer: 0.13
Correct Answer: friability & oxygen content.
Correct Answer: Cristobalite
Correct Answer: positive
Correct Answer: Barium salt
Correct Answer: Poisson's ratio
Correct Answer: isothermal
Correct Answer: enthalpy remains constant.
Correct Answer: L.D. converter gas
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