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- Question
Rate of slag attack on refractories increases with rise in temperature due to the
Options- A. decreased viscosity of slag.
- B. increased thermal conductivity of brick.
- C. oxidising condition in the furnace.
- D. none of these.
- Correct Answer
- decreased viscosity of slag.
- 1. An element having large number of __________ is most easily subjected to nuclear fission.
Options- A. protons
- B. electrons
- C. neutrons
- D. nucleons Discuss
- 2. The depreciation during the year 'n', in diminishing balance method of depreciation calculation, is calculated by multiplying a fixed percentage 'N' to the
Options- A. initial cost.
- B. book value at the end of (n - 1)th year,
- C. depreciation during the (n - 1)th year.
- D. difference between initial cost and salvage value. Discuss
- 3. If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.
Options- A. the solvent begins to freeze out even before
- B. it will undergo no change until
- C. it will not solidify even on
- D. none of these Discuss
- 4. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 ? CO2 + 2H2O. Both the reactants and products are in gas phase. ?H°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to
Options- A. 1225
- B. 1335
- C. 1525
- D. 1735 Discuss
- 5. __________ is not an important refinery process for upgrading the quality of lubricating oil.
Options- A. Deoiling
- B. Solvent refinning
- C. Clay treatment
- D. Hydrotreatment Discuss
- 6. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
Options- A. Di, opt = 3 Q0.36 ?0.18
- B. Di, opt = 3.9 Q0.45 . ?0.23
- C. Di, opt = 7.6 Q0.36 . ?0.9
- D. Di, opt = 3 Q0.36 . ?1.86 ?0.08 Discuss
- 7. 'Spinel', a refractory mineral is chemically represented as
Options- A. MgAl2O4
- B. MgAl2O3
- C. MgSO4
- D. MgAl2O3.2H2O Discuss
- 8. Non-metallic diaphragm used as pressure sensor in instruments is generally made of
Options- A. teflon
- B. synthetic rubber
- C. bakelite
- D. thick paper Discuss
- 9. The main purpose of control rod in a nuclear reactor is to control the
Options- A. chain reaction and hence the power output by regulating the number of secondary neutrons causing fission.
- B. emission of hazardous radiation.
- C. conversion of fissile material into fertile material.
- D. velocity of the secondary neutrons. Discuss
- 10. Very fine suspended and colloidal impurities are removed from water by a process called
Options- A. sedimentation
- B. coagulation
- C. disinfection
- D. softening Discuss
More questions
Correct Answer: nucleons
Correct Answer: book value at the end of (n - 1)th year,
Correct Answer: it will undergo no change until
Correct Answer: 1735
Correct Answer: Deoiling
Correct Answer: Di, opt = 3 Q0.36 ?0.18
Correct Answer: MgAl2O4
Correct Answer: synthetic rubber
Correct Answer: chain reaction and hence the power output by regulating the number of secondary neutrons causing fission.
Correct Answer: coagulation
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