Combustion of pulverised coal as compared to that of lump coal ________________?

A. Develops a non-luminous flame
B. Develops a low temperature flame
C. Can be done with less excess air
D. Provides a lower rate of heat release

Calorific value of dry wood may be around ______________ Kcal/kg?

A. 5
B. 50
C. 500
D. 5000

Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as_______________?

A. M = 1.8 A
B. M = 0.5 A
C. M = 1.1 A
D. M = A

Flue gas from the heating chamber of by product coke ovens is removed by________________?

A. Forced draft fan
B. Induced draft fan
C. Steam ejector
D. Natural draft

Safe condition for storage of high V.M. bituminous coal is that ___________________?

A. Height of the coal heap should be < 3 metres
B. Maximum 200 tons should be stored in a heap
C. Both A. and B.
D. Neither A. nor B.

Which of the following is used for making the explosive „TNT‟ ?

A. Benzol
B. Toluene
C. Pyridine
D. Cerosote

Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?

A. CO content
B. Dew point
C. CO2 content
D. O2 content

Producer gas containing least amount of tar is produced by the_________________?

A. Partial combustion of coal
B. Partial combustion of large size (< 50 mm) coke
C. High pressure gasification of coal (e.g. in Lurgi gasifier)
D. Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)

Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about ______________ °C?

A. 30
B. 65
C. 120
D. 180

The function of secondary combustion air is to ______________________?

A. Pneumatically convey the pulverised coal
B. Completely burn the volatile matter
C. Burn the lumpy coal
D. None of these