Among petrol and diesel engines, which is more efficient ?

Assertion: CNG is better than diesel/petrol Reason: Unlike petrol or diesel, CNG burns more efficiently in the automobiles and very little of it is left unburnt.

In diesel engine, ignition is caused by

Petrol and diesel prices will be revised on …………………

Bhuvan and Company has invented a fuel saving instrument which can reduce the consumption of petrol and diesel if it is attached in the engine of vehicle. Suggest any two media which the company must select to advertise for this product and why.

In internal combustion petrol/diesel engines, only cyclic processes are used, because:

In internal combustion petrol/diesel engines, only cyclic processes are used, because:

(a)Compare the otto cycle with diesel cycle. (b)Explain the working of a diesel engine. Derive an expression for its efficiency.