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Statement (I): Air-blast injection in diesel engines could reduce engine efficiency. Statement (II): Air-blast injection in diesel engine is not instantaneous but happens when the piston moves outward with the injection valve remaining open for whatever reason.
Study the following table:   June 2007 December 2014 Price of petrol in Rs/litre 47.74 61.33 Price of diesel in Rs/litre 35.21 50.51   After studying the above table, Devmeet a class V student wrote the following in his notebook: A. Petrol is more expensive fuel than diesel. B. The percentage increase in the price of diesel is more than that of petrol. C. Diesel is cheaper and that is why public transport runs on it. D. Diesel is cheaper fuel than petrol. People should buy diesel vehicles. Which one of the following is correct?
Which of the following actions will help to reduce the black smoke emission of a diesel engine? 1. Run at lower load, i.e. derating 2. Have regular maintenance of the diesel engine, particularly of injection system 3. Use diesel oil of higher cetane number Select the correct answer using the code given below.
80 litres of diesel is required to travel 800 km using a 800 cc engine. If the volume of diesel required to cover a distance varies directly as the capacity of the engine, then how many litres of diesel is required to travel 1000 kms using 1200 cc engine ?
In a diesel engine
1. Fuel injection pump is used
2. Fuel injection pump and carburettor is used
3. Fuel injector is used
4. Neither fuel injection pump nor injector is used
Consider the following statements regarding supercharging of Diesel engines: 1) The mechanical efficiency of a supercharged diesel engine is slightly better than that of the naturally aspirated engine. 2) There is a reduction in smoke in the case of a supercharged engine in the overload operation. 3) Increased valve overlap is used in the supercharged engine. Which of the above statements are correct?
Which one of the statement is correct?
1. Petrol engine is a reciprocating engine
2. Petrol engine is high speed engine
3. Petrol engine uses petrol as fuel
4. Petrol engine is internal combustion engine
Once a study was conducted about the impact of inflation on the prices of petrol and diesel. It has been observed during recent survey that the price of diesel increases by 40 paise every year. Apart from that it is been also observed that the price of petrol also increases by 15 paise every year. If in 2016, the price of petrol was Rs. 65.30 and that of diesel was Rs. 53.70, after how many years will diesel cost 40 paise more than the petrol?
Consider the following statement with reference to combustion and performance in a four-stroke petrol engine: 1. The auto-ignition temperature of petrol as a fuel is higher than that of diesel oil as a fuel. 2. The highest compression ratio of petrol engines is constrained by the possibility of detonation. 3. A petrol engine is basically less suitable for supercharging than a diesel engine. Which of the above statements are correct?
A six-cylinder, four-stroke diesel engine develops a power of 200 kW at 2000 revolution per minute. The brake specific fuel consumption is 0.3 kg / kW – h. What is the time for injection if the injection takes place over 20° crank angle?