The knocking in diesel engines may be prevented by All of these Reducing the delay period Increasing the inlet pressure of air Raising the compression ratio TRUE ANSWER : ? YOUR ANSWER : ?
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be Higher None of the listed here Remain unaffected Lower TRUE ANSWER : ? YOUR ANSWER : ?
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft 43832 2 1 4 TRUE ANSWER : ? YOUR ANSWER : ?
For the same power developed in I.C. engines, the cheaper system is Turbo charger Supercharged Centrifugal pump Naturally aspirated TRUE ANSWER : ? YOUR ANSWER : ?
The frictional power (F.P.) is given by P. F.P. = I.P. - F.P. = F.P. = I.P./ F.P. = P. P. - I.P. P./I.P. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following medium is compressed in a Diesel engine cylinder? Air and fuel Fuel alone Air alone Air and lub oil TRUE ANSWER : ? YOUR ANSWER : ?
During idling, a petrol engine requires _________ mixture. Lean Chemically correct None of these Rich TRUE ANSWER : ? YOUR ANSWER : ?
The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is More Less Same May be more or less depending on engine capacity TRUE ANSWER : ? YOUR ANSWER : ?
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided Flywheel size is proper Best quality fuel is used It is properly designed Cannot work as it is impossible TRUE ANSWER : ? YOUR ANSWER : ?
The mechanical efficiency (ηm) of the engine is given by ηm = I.P/B.P ηm = B.P/I.P ηm = (B.P × I.P)/100 None of these TRUE ANSWER : ? YOUR ANSWER : ?