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- Question
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
Options- A. Cork
- B. Saw dust
- C. Sand
- D. Chemically prepared foam
- Correct Answer
- Sand
- 1. Energy produced in the nuclear fission is of the order of __________ MeV.
Options- A. 20
- B. 200
- C. 1000
- D. 2000 Discuss
- 2.
for a Tee (used as elbow, entering run) would be around
Options- A. 5
- B. 60
- C. 200
- D. 350 Discuss
- 3. 200 mesh seive size corresponds to __________ microns.
Options- A. 24
- B. 74
- C. 154
- D. 200 Discuss
- 4. Polycaprolactum is also known as
Options- A. nylon-66
- B. nylon-6
- C. teflon
- D. SBR Discuss
- 5. Carbon/hydrogen ratio (by weight) is maximum (out of following) for
Options- A. gasoline
- B. kerosene
- C. light gas oil
- D. heavy fuel oil Discuss
- 6. Salt content in sea water is about __________ percent.
Options- A. 0.5
- B. 1
- C. 3.5
- D. 10 Discuss
- 7. Refractoriness/fusion points of 'superduty' refractories is __________ °C.
Options- A. 1520-1630
- B. 1630-1670
- C. > 1730
- D. > 2000 Discuss
- 8. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
Options- A. 4000
- B. 2100
- C. 1500
- D. 3000 Discuss
- 9. Plastic tubes & pipes are generally made by __________ moulding.
Options- A. injection
- B. transfer
- C. extrusion
- D. compression Discuss
- 10. pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant.
Options- A. 4-5
- B. 7-8
- C. 9-10
- D. 12-13 Discuss
More questions
Correct Answer: 200
Correct Answer: 60
Correct Answer: 74
Correct Answer: nylon-6
Correct Answer: gasoline
Correct Answer: 3.5
Correct Answer: > 1730
Correct Answer: 2100
Correct Answer: extrusion
Correct Answer: 7-8
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