Q.1
Sulphur in metallurgical coal
Q.2
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
Q.3
In low temperature carbonisation of coal, the
Q.4
Out of the following, which is the most important parameter for the blast furnace grade coke?
Q.5
The hottest part of the flame lies in its____zone.
Q.6
The fuel ratio of a coal is
Q.7
Moisture loss is determined by the
Q.8
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the
Q.9
A coal containing high amount of volatile matter will have
Q.10
The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
Q.11
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as
Q.12
Which of the following has the highest calorific value (kcal/Nm³) ?
Q.13
Which of the following has the least calorific value (kcal/Nm³) ?
Q.14
The weathering index of a coal
Q.15
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?
Q.16
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.
Q.17
Which of the following would require least amount of secondary air for combustion?
Q.18
During combustion of gaseous fuels, deficiency of air
Q.19
Soft coke is not
Q.20
With increases in carbonisation temperature
Q.21
Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
Q.22
A coal having higher volatile matter content, has lower
Q.23
The function of secondary combustion air is to
Q.24
KOH solution used in orsat apparatus absorbs
Q.25
When the coal is heated in absence of air, it is called its
Q.26
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
Q.27
Presence of phosphorous in metallurgical coal
Q.28
Coke ovens in steel plant are heated by
Q.29
Combustion reaction of fuels is a/an __________ reaction.
Q.30
During the carbonisation of coal
Q.31
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?
Q.32
One kg of carbon for theoretically complete combustion requires __________ kg of air.
Q.33
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
Q.34
Which of the following is not a by-product fuel?
Q.35
Which of the following is not a by-product fuel?
Q.36
Short/intense flame is produced during combustion of gaseous fuel by using
Q.37
Which of the following has the highest flame velocity?
Q.38
Which of the following gaseous fuels has the lowest calorific value?
Q.39
Ultimate analysis of coal determines its __________ content.
Q.40
Proximate analysis of coal determines its __________ content.
Q.41
Which of the following is not a micro component present in coal?
Q.42
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
Q.43
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
Q.44
Carbon Content by weight in air dried wood may be about __________ percent.
Q.45
Volatile matter content in coking coal may be about __________ percent.
Q.46
Dry air required to burn 1 kg of carbon completely may be around __________ kg.
Q.47
Narrow coke ovens as compared to wider coke ovens
Q.48
Insitu theory and drift theory are related to the
Q.49

Pick out the wrong statement.

  • LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
  • The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
  • Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
  • Maximum yield of naphthalene is obtained on distillation of crude oil.
Q.50

Stack heat losses can be minimised by

  • controlling the excess air.
  • oxygen enrichment of combustion air.
  • using low c.v. fuels.
  • maintaining proper draft in the furnace.
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