21
One kg of carbon for theoretically complete combustion requires __________ kg of air.
A)
11.5
B)
0.5
C)
23
D)
12
Answer & Solution
Answer: Option
A
22
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
A)
1 kg mole
B)
22.4 Nm3
C)
32 kg
D)
All of the above
Answer & Solution
Answer: Option
D
23
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
A)
H2
B)
CH4
C)
CO2
D)
N2
Answer & Solution
Answer: Option
B
24
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
A)
Sulphur
B)
Oxygen
C)
Hydrogen
D)
Carbon
Answer & Solution
Answer: Option
B
25
Insitu theory and drift theory are related to the
A)
Origin of petroleum oil
B)
Origin of coal
C)
Coalification
D)
Variation of coal quality with depth
Answer & Solution
Answer: Option
B
26
During the carbonisation of coal
A)
All tar is evolved at < 600°C
B)
Evolution of H2 and formation of methane and aromatics occur at > 700°C
C)
Hard semi-coke starts shrinking at 600°C
D)
All of the above
Answer & Solution
Answer: Option
D
27
Ultimate analysis of coal determines its __________ content.
A)
Carbon, hydrogen, nitrogen & sulphur
B)
Carbon, ash, sulphur & nitrogen
C)
Carbon, sulphur, volatile matter & ash
D)
Carbon, volatile matter, ash & moisture
Answer & Solution
Answer: Option
A
28
Proximate analysis of coal determines its __________ content.
A)
Moisture, ash, sulphur & volatile matter
B)
Moisture, volatile matter, ash & fixed carbon
C)
Moisture, sulphur, nitrogen & fixed carbon
D)
None of these
Answer & Solution
Answer: Option
B
29
Which of the following is not a micro component present in coal?
A)
Micrinite
B)
Clarain
C)
Fusinite
D)
Liptinite
Answer & Solution
Answer: Option
B
30
Narrow coke ovens as compared to wider coke ovens
A)
Produce smaller coke
B)
Produce stronger coke
C)
Require less time of carbonisation
D)
All of the above
Answer & Solution
Answer: Option
D
