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An O.C. mine requires 16 blocks of overburden of 3000 te each to mine 4 blocks of coal of 2000 te each. The mining cost of both overburden and coal is Rs. 50 per tonne. The cost of transportation of overburden to dump areas is Rs. 50 per tonne. Coal transportation cost to the selling point is Rs. 75 per tonne. The price of coal is Rs. 800 per tonne, If the royalty and tax to the state is Rs. 50 per tonne, the nominal profit in rupees is
A construction company purchases cement at the rate of Rs. 1,000 per tonne and stores it at Rs. 100 per tonne. It is perceived that in the coming month, the price of cement will rise by Rs. 2,000 per tonne. The company already has 500 tonnes of cement. If the cement usage during a month is 1,000 tonnes, how much cement should the company purchase this month to minimize its expense in the next one?
A solid-oxide fuel cell is fed with carbon monoxide and reacts with air to produce CO2. This reaction will produce 2 electrons which are used to power an electric circuit external to the fuel cell. The reaction equation is shown below: 2CO(g) + O2(g) -> 2CO2(g) ΔHr° = -565.96 kJ/mol This reaction does not occur for other types of fuel cells which use a catalyst, such as polymerelectrolyte membrane or phosphoric-acid fuel cells. The presence of carbon monoxide on the anode side of these types of fuel cells will cause catalyst poisoning, reducing the efficiency and voltage of the fuel cell. Determine the rate of enthalpy change for a carbon dioxide production rate of 208 mol/hr. The extent of the reaction occurring in the fuel cell can be obtained by the following equation: where:
Each of the question below consists of a question and three statements number I, II and III given below it. You have to decide whether the data provided in the statement are sufficient to answer the question. Sid has a monthly income of Rs. 60000 out of which every month he saves some amount. He distributes some amount of money among his three sisters and one brother. Out of remaining amount of his income, he spends 40% on other things and rest of the amount is saved by him. What percent of money is received by each sister if each sister receives equal amount? Statement I: Each sister received Rs. 500 less than the amount received by brother and Sid’s other expenditure is Rs. 16800. Statement II: Sid saves Rs. 25200 on every month. Statement III: Each sister and brother received equal amount and saving are Rs. 25200.
Study the given pie-chart and answer the question that follows. The pie-chart represents the consumption of fuel (in million litres) by various modes of transport of a country X in the year 2015. The total consumption of fuel by various modes of transport of the country is 800 million litres. (The data shown here is only for mathematical exercise. They do not represent the actual figures of the country.) To obtain fuel, energy is required to run the machinery. which is to be produced by burning coal. If 1 tonne of coal is burnt to produce 0.4 million litres of oil, then approximately what is the requirement of coal (in tonnes) for the Trains sector?
The pie chart given below shows the amount spent by a boy on the purchase of six different items. The total amount spent on all these six items is Rs. 54000. The amount spent on a specific item is represented as a degree with reference to the total amount spent on all these six items. Which of the following statement(s) is/are correct? I. The amount spent on article A is Rs.900 less than the amount spent on article B. II. The amount spent on article C is Rs 2400 more than the amount spent on article D. III. The ratio of the amount spent on article B to the amount spent on article E is 4 : 1.
A concentrator pilot plant is fed with 1 tonne of copper ore at ROM grade of 1.5 % Cu. Metal recovery in the concentrator pilot plant is 90% and the grade of copper in concentrate is 20%. The amount of concentrate produced from 1 tonne of ore in kg is
The pie chart given below shows the fuel consumption by five vehicles V1, V2, V3, V4 and V5. In a month total fuel consumption by all five vehicles is 720 litre. Fuel consumption of a particular vehicle is shown in terms of degree with respect to the total fuel consumption by all these five vehicles. J1 = Difference between the fuel consumption of V4 and V5. J2 = Difference between the fuel consumption of V1 and V2. What is the value of J2 – J1?
With reference to 'fuel cells' in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements: 1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products. 2. Fuel cells can be used for powering buildings and not for small devices like laptop computers. 3. Fuel cells produce electricity in the form of Alternating Current (AC) Which of the statements given above is/are correct?
With reference to 'fuel cells' in which hydrogen rich fuel and oxygen are used to generate electricity. Consider the following statements.
1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by products.
2. Fuel cells can be used for powering buildings and not for small devices like laptop, computers.
3. Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is/are correct?