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- Question
SiO2 percentage in firebrick is about
Options- A. 35-40
- B. 55-60
- C. 80-85
- D. >94
- Correct Answer
- 55-60
- 1. For a non-spherical particle, the sphericity
Options- A. is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
- B. has the dimension of length.
- C. is always less than 1.
- D. is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle. Discuss
- 2. Pick out the wrong statement.
Options- A. Raoult's law holds good for the solubility of polar gases in non-polar liquids.
- B. Molecules with symmetrical arrangement (e.g., CH4 and CCl4) are non-polar.
- C. Most of the hydrocarbons are nonpolar.
- D. Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise. Discuss
- 3. The yield of straight run LPG from crude oil is about __________ weight percent.
Options- A. 20-25
- B. 1-1.5
- C. 10-15
- D. 0.1-0.2 Discuss
- 4. Presence of SO2 in furnace gases attacks the ferrous metal by way of
Options- A. accelerating the rate of scaling.
- B. causing metal embrittlement.
- C. attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature.
- D. all (a), (b) and (c). Discuss
- 5. The amount of tetraethyl lead added to improve the octane number of motor gasoline is around __________ c.c per gallon of petrol.
Options- A. 3
- B. 300
- C. 3000
- D. 1000 Discuss
- 6. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function
will have a definite num-ber of loci for variation of K from 0 to ?. The number of loci is
Options- A. 1
- B. 3
- C. 4
- D. 2 Discuss
- 7. Stefan's law describes the mass transfer by
Options- A. diffusion
- B. bulk flow
- C. both 'a' & 'b'
- D. neither 'a' nor 'b' Discuss
- 8. A pipe is generally made of circular cross-section, because a circular cross-section has the
Options- A. higher structural strength.
- B. lowest surface area requirement for a given volume.
- C. both (a) & (b).
- D. none of these. Discuss
- 9. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
Options- A. 2
- B. 20.8
- C. 20.2
- D. none of these Discuss
- 10. Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called
Options- A. spalling resistance.
- B. refractoriness.
- C. refractoriness under load (RUL).
- D. none of these. Discuss
More questions
Correct Answer: is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
Correct Answer: Raoult's law holds good for the solubility of polar gases in non-polar liquids.
Correct Answer: 1-1.5
Correct Answer: all (a), (b) and (c).
Correct Answer: 3
Correct Answer: 3
Correct Answer: both 'a' & 'b'
Correct Answer: both (a) & (b).
Correct Answer: 20.8
Correct Answer: spalling resistance.
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