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The advancing of spark timing in spark ignition engines will _________ knocking tendency.
My Scooty gives an average of 40 kmpl of petrol. But after recent filling at the new petrol pump, its average dropped to 38 kmpl. I investigated and found out that it was due to adulterated petrol. Petrol pimps add kerosene, which is $$\frac{2}{3}$$  cheaper than petrol, to increase their profits. Kerosene generates excessive smoke and knocking and gives an average of 18 km per 900 ml. If I paid Rs. 30 for a litre of petrol, What was the additional amount the pump-owner was making?
Consider the following statements with regard to IC engines: 1. For best fuel economy of spark ignition engines, the fuel-air mixture should be lean 2. With supercharging, the specific consumption in compression ignition engines increases 3. With increase of load, knocking tendency in compression ignition engines increases Which of the above statements are correct?
Two statements and a few problems are given. Which of the following problems can be solved through these statements? Statement I: A container contains 28L mixture of diesel and petrol. Statement II: The ratio of diesel to petrol is 3 : 1 and 28L of Petrol is added to the container. Problem 1: What is the quantity petrol in the container before petrol is added? Problem 2: What is the ratio of diesel to Petrol in the final mixture? Problem 3: What is the cost of Petrol in the mixture if total cost of mixture is Rs.1500?
Which of the following factors can control detonation in spark ignition engines? 1. Increasing engine rpm 2. Advancing spark timing 3. Making fuel-air ratio very rich
Consider the following statements pertaining to supercharging of engines: 1. The power output for a given engine increases 2. The loss of power due to altitude is compensated 3. The increase in supercharging pressure decreases the tendency to detonate in spark ignition engines 4. The mechanical efficiency of supercharged engines is quite high compared to naturally aspirated engines Which of the above statements are correct?
Oxides of nitrogen in Petrol engine exhaust can be reduced by the following methods: 1. Use of 5% lean mixture 2. Advancing the spark timing 3. Recirculating a fraction of exhaust gas 4. Using an oxidation catalyst in the exhaust manifold Which of the above statements is/are correct?
Oxides of nitrogen in Petrol engine exhaust can be reduced by the following methods:
1. Use of 5% lean mixture
2. Advancing the spark timing
3. Recirculating a fraction of exhaust gas
4. Using an oxidation catalyst in the exhaust manifold
Which of the above statements is/are correct?
In an SI engine the first state of combustion takes 1 ms at 1000 rpm of the engine. The spark timing is set at 15°C btdc. What will be the new spark timing required if the engine speed is doubled?
It is necessary to have centrifugal advance of the spark timing since the lean mixtures require an earlier spark timing than the rich mixtures.