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Air of 20.8% O2, concentration enters a coal mine panel at 20 m3/s and exits with 20.6% O2. The oxygen depletion is due to oxidation of carbon in spontaneous heating process only, assuming the density of oxygen as 1.3 kg/m3 and the calorific value of carbon as 34 MJ/kg, the heat generated in kW from the panel due to spontaneous oxidation is
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.
Despite having large reserves of coal, why does India import millions of tonnes of coal? 1. It is the policy of India to save its own coal reserves for the future, and import them from other countries for the present use. 2. Most of the power plants in India are coal-based and they are not able to get sufficient supplies of coal from within the country. 3. Steel companies need a large quantity of coking coal which has to be imported. Which of the statements given above is/are correct?       
Which of the following are essential for a good combustion chamber of turbojet engine? 1. It should allow complete combustion of fuel. 2. It should maintain sufficiently high temperature in the zone of combustion in addition to proper atomization of fuel thus leading to continuous combustion. 3. It should not have high rate of combustion. 4. The pressure drop should be as small as possible
In India, what is the role of the Coal Controller's Organization (CCO)? 1. CCO is the major source of Coal Statistics in Government of India. 2. It monitors progress of development of Captive Coal/Lignite blocks. 3. It hears any objection to the Government's notification relating to acquisition of coal-bearing areas. 4. It ensures that coal mining companies deliver the coal to end users in the prescribed time. Select the correct answer using the code given below:
Consider the following statements and choose the correct answer:
1. At low temperature, the viscosity of water increases
2. Low temperature retards the growth of the roots
3. At low temperature, viscosity of protoplasm and cell wall decreases
4. Low temperature increases the metabolic activities of the root cells
Which of the following statements regarding coal is incorrect? 1. Coal occurs in Gondwana and Tertiary formations in India. 2. Tertiary coal contributes the majority stakes in coal production in India. 3. Jharkhand ranks highest in production as well as reserves of coal in India. 
Consider the following problems being faced by the Indian Coal Industry : I. Poor quality of coal and bottlenecks in the coal movement II. Low utilisation capacity of washeries III. Growing dependence on the import of coking coal IV. Administered prices
Consider the following problems being faced by the Indian Coal Industry :
I. Poor quality of coal and bottlenecks in the coal movement
II. Low utilisation capacity of washeries
III. Growing dependence on the import of coking coal
IV. Administered prices