51
Water gas constitutes mainly of
A)
CO & H2
B)
CO & N2
C)
CO2 & H2
D)
CH4 & H2
Answer & Solution
Answer: Option
A
52
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
A)
Low
B)
High
C)
Very high, if the fuel is of low calorific value
D)
None of these
Answer & Solution
Answer: Option
A
53
C/H ratio is the maximum in case of
A)
Coal
B)
Furnace oil
C)
Natural gas
D)
Naphtha
Answer & Solution
Answer: Option
A
54
Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
A)
200°F
B)
200°C
C)
200°K
D)
200°R
Answer & Solution
Answer: Option
A
55
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively
A)
CO2 , O2 , CO
B)
CO, O2 , CO2
C)
CO2 , CO, O2
D)
O2 , CO2 , CO
Answer & Solution
Answer: Option
A
A)
Ignites less easily than anthracite
B)
Is generally coking
C)
Burns with smoky yellow flame
D)
Both B and C
Answer & Solution
Answer: Option
D
57
The main product of high temperature carbonisation of coal is
A)
Coke
B)
Ammonia
C)
Tar
D)
Coke oven gas
Answer & Solution
Answer: Option
A
58
With increase in the temperature of carbonisation of coal
A)
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
B)
Methane content in the coke oven gas decreases and carbon monoxide content increases
C)
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H2 content
D)
All of the above
Answer & Solution
Answer: Option
D
59
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
A)
0.5
B)
10
C)
50
D)
500
Answer & Solution
Answer: Option
B
A)
Facilitates by-products recovery
B)
Takes 2-3 days for coking of coal but requires no external fuel for heating
C)
Gives larger yield of coke (around 85%) as compared to by-product ovens
D)
Produces coke with very poor strength
Answer & Solution
Answer: Option
B
