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- Question
Which is not a high alumina refractory?
Options- A. Mullite
- B. Corrundum
- C. Bauxite
- D. Dolomite
- Correct Answer
- Dolomite
- 1. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
Options- A. flight
- B. slat or drag
- C. ribbon
- D. screw Discuss
- 2. Characteristic equation is the denominator of __________ loop transfer function.
Options- A. open
- B. closed
- C. both (a)and (b)
- D. neither (a) nor (b) Discuss
- 3. 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. Discuss
- 4. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
Options- A. 102
- B. 105
- C. 109
- D. 1015 Discuss
- 5. Insufficient washing of sand grains in a rapid sand filter causes
Options- A. air binding
- B. shrinkage of filtering media
- C. mud balls
- D. expansion of filtering media Discuss
- 6. Which of the following oxides is not present in hematite iron ore?
Options- A. Titanium oxide
- B. Calcium oxide
- C. Cobalt oxide
- D. Manganese oxide Discuss
- 7. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as
Options- A. d = 1.1 t
- B. d = 1.6 t
- C. d = 1.5 t
- D. 3t Discuss
- 8. The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is
Options- A. 0.4
- B. 0.6
- C. 0.8
- D. 0.2 Discuss
- 9. One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The amount of water vapour condensed (in kg) is
Options- A. 0.0
- B. 0.065
- C. 0.1
- D. 1.0 Discuss
- 10. The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.
Options- A. 5 to 10
- B. 15 to 30
- C. 40 to 50
- D. 55 to 75 Discuss
More questions
Correct Answer: screw
Correct Answer: closed
Correct Answer: Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
Correct Answer: 105
Correct Answer: mud balls
Correct Answer: Cobalt oxide
Correct Answer: d = 1.6 t
Correct Answer: 0.6
Correct Answer: 0.065
Correct Answer: 15 to 30
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