The cam shaft of a four stroke I.C. engine running at 1500 rpm will run at 750 rpm 3000 rpm Any value independent of engine speed 1500 rpm TRUE ANSWER : ? YOUR ANSWER : ?
Detonation is harmful due to Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls High intensity of knock causes crankshaft vibration and the engine runs rough None of these Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine TRUE ANSWER : ? YOUR ANSWER : ?
A petrol engine, during suction stroke draws Petrol only A mixture of petrol and air None of these Air only TRUE ANSWER : ? YOUR ANSWER : ?
The self ignition temperature of petrol is _________ as compared to diesel oil. Higher Lower Same None of these TRUE ANSWER : ? YOUR ANSWER : ?
Scavenging air in diesel engine means Air used for forcing burnt gases out of engine's cylinder during the exhaust period Burnt air containing products of combustion Forced air for cooling cylinder Air used for combustion sent under pressure 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 Best quality fuel is used Cannot work as it is impossible Flywheel size is proper It is properly designed TRUE ANSWER : ? YOUR ANSWER : ?
The tangential velocity of the water element having a free vortex is Directly proportional to its (distance)2 from the centre Directly proportional to its distance from the centre Inversely proportional to its (distance)2 from the centre Inversely proportional to its distance from the centre TRUE ANSWER : ? YOUR ANSWER : ?
The air-fuel ratio of the petrol engine is controlled by Injector Fuel pump Governor Carburettor TRUE ANSWER : ? YOUR ANSWER : ?
Diesel as compared to petrol is None of these Highly ignitable More difficult to ignite Less difficult to ignite TRUE ANSWER : ? YOUR ANSWER : ?
Fuel oil consumption guarantees for I .C. engine are usually based on Low heat value of oil Net calorific value of oil Calorific value of fuel High heat value of oil TRUE ANSWER : ? YOUR ANSWER : ?