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- Question
Pick out the wrong statement.
Options- A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'.
- B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
- C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
- D. Tungsten steel and alnico are not hard magnetic materials.
- Correct Answer
- Tungsten steel and alnico are not hard magnetic materials.
- 1. Balls for ball mills are never made of
Options- A. forged/cast steel
- B. lead
- C. cast iron
- D. alloy steel Discuss
- 2. Molecular weight of crude petroleum may be around
Options- A. 50
- B. 250
- C. 1500
- D. 5000 Discuss
- 3. Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the
Options- A. presence of an inert atmosphere.
- B. presence of a reducing atmosphere.
- C. absence of air.
- D. presence of an oxidising atmosphere. Discuss
- 4. Temperature and pressure in ammonia converter is
Options- A. 200 atm, 1000°C
- B. 450 atm, 200°C
- C. 450 atm, 550°C
- D. 450 atm, 1000°C Discuss
- 5. Black liquor generated during paper manufacture is concentrated in a
Options- A. single effect evaporator.
- B. single effect evaporator followed by a crystalliser.
- C. multiple effect evaporator.
- D. multiple effect evaporators followed by a crystalliser. Discuss
- 6. 'Lang factor' is defined as the ratio of the capital investment to the delivered cost of major equipments. The value of 'Lang factor' for fixed capital investment, for a solid-fluid processing chemical plant ranges from
Options- A. 1.2 to 1.4
- B. 2.5 to 2.7
- C. 4.2 to 4.4
- D. 6.2 to 6.4 Discuss
- 7. 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
- 8. When one of the fluids is highly corrosive and has fouling tendency, it should
Options- A. preferably flow inside the tube for its easier internal cleaning.
- B. perferably flow outside the tube.
- C. flow at a very slow velocity.
- D. flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current. Discuss
- 9. H2S present in gaseous stream can be removed by adsorption on
Options- A. silica gel
- B. active carbon
- C. bog iron
- D. limestone powder Discuss
- 10. Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature
Options- A. rate of reaction is very low.
- B. very high pressure is required resulting in costly pressure vessel.
- C. space velocity of gas is very low resulting in decreased conversion.
- D. none of these Discuss
More questions
Correct Answer: lead
Correct Answer: 1500
Correct Answer: absence of air.
Correct Answer: 450 atm, 550°C
Correct Answer: multiple effect evaporator.
Correct Answer: 4.2 to 4.4
Correct Answer: less than arithmetic mean value.
Correct Answer: preferably flow inside the tube for its easier internal cleaning.
Correct Answer: bog iron
Correct Answer: rate of reaction is very low.
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