Height of the coal heap should be < 3 metres
Maximum 200 tons should be stored in a heap
Both A and B
Neither A nor B
✅ The correct answer is option C.
Engineering
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3072. Highly reactive coke have lower
Porosity
Coke reactivity index (CRI)
Critical air blast (CAB) value
Both B and C
✅ The correct answer is option C.
3073. Which of the following has the highest flame velocity?
H₂
CO
CH₄
C₂H₆
✅ The correct answer is option A.
3074. The fuel ratio of a coal is
The ratio of its percentage of fixed carbon to that of volatile matter
Helpful in estimation of its rank
Both A and B
Neither A nor B
✅ The correct answer is option C.
3075. Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.
15-30
1-Feb
70-100
150-200
✅ The correct answer is option A.
3076. Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
80-170
200-300
250-270
280-300
✅ The correct answer is option A.
3077. Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as
M = 1.8 A
M = 0.5 A
M = 1.1 A
M = A
✅ The correct answer is option C.
3078. Junker’s calorimeter is used to determine the calorific value of
Pulverised coal
Gaseous fuels
Fuel oil
None of these
✅ The correct answer is option B.
3079. Coking coals are invariably
Lignites
Bituminous coals
Semi-anthracites
Anthracites
✅ The correct answer is option B.
3080. ‘Fuel’ can be defined as a substance which produces heat by
Combustion
Nuclear fission
Nuclear fusion
All of the above
✅ The correct answer is option D.