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- Question
Pick out the wrong statement pertaining to the turbine agitator.
Options- A. Recommended peripheral speed for the turbine agitator is 200-250 metres/minute.
- B. Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
- C. Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter).
- D. Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used.
- Correct Answer
- Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
- 1. Overall tray efficiency of a distillation column is the ratio of the number of
Options- A. overall gas transfer units to the number of ideal trays required.
- B. ideal trays required to the number of real trays required.
- C. real trays required to the number of ideal trays required.
- D. none of these. Discuss
- 2. In physical adsorption, as compared to chemisorption, the
Options- A. quantity adsorbed per unit mass is higher.
- B. rate of adsorption is controlled by the resistance to surface reaction.
- C. activation energy is very high.
- D. heat of adsorption is very large. Discuss
- 3. Pick out the wrong statement.
Options- A. Refractories used in muffle furnace should have low thermal conductivity.
- B. The electrical resistivity of refractories drops rapidly with rise in temperature.
- C. For reducing spalling tendency, the refractory should be well fired and its porosity should be more.
- D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness. Discuss
- 4. Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because
Options- A. the strong base and strong acid reacts completely.
- B. the salt formed does not hydrolyse.
- C. only OH- and H+ ions react in every case.
- D. the strong base and strong acid reacts in aqueous solution. Discuss
- 5. Close circuit grinding by a ball mill with air sweeping employs a
Options- A. classifier.
- B. cyclone separator between mill & classifier.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 6. Pick out the wrong statement.
Options- A. Momentum transfer in laminar flow results from veclocity gradient.
- B. A fluid in equilibrium is not free from shear stress.
- C. The viscosity of a non-Newtonion fluid is a function of temperature only.
- D. both (b) and (c) Discuss
- 7. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter
Options- A. increases
- B. decreases
- C. remain unaffected
- D. none of these Discuss
- 8. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
Options- A. 1
- B. 2
- C. 3
- D. 7 Discuss
- 9. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.
Options- A. 250
- B. 350
- C. 550
- D. 700 Discuss
- 10. Low grade coal is __________ to produce ammonia synthesis gas.
Options- A. hydrogenated
- B. liquefied
- C. gasified
- D. dehydrogenated Discuss
More questions
Correct Answer: ideal trays required to the number of real trays required.
Correct Answer: quantity adsorbed per unit mass is higher.
Correct Answer: Refractories used in muffle furnace should have low thermal conductivity.
Correct Answer: only OH- and H+ ions react in every case.
Correct Answer: both (a) & (b).
Correct Answer: both (b) and (c)
Correct Answer: decreases
Correct Answer: 3
Correct Answer: 550
Correct Answer: gasified
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