Detonation is harmful due to Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls None of these High intensity of knock causes crankshaft vibration and the engine runs rough TRUE ANSWER : ? YOUR ANSWER : ?
In a four stroke cycle diesel engine, the compression Starts at 40° after bottom dead center and ends at 10° before top dead center Starts at 40° before top dead center and ends at 40° after top dead center Starts at top dead center and ends at 40° before bottom dead center May start and end anywhere TRUE ANSWER : ? YOUR ANSWER : ?
A flow in which the quantity of liquid flowing per second is constant, is called __________ flow. Steady Unsteady Turbulent Streamline TRUE ANSWER : ? YOUR ANSWER : ?
The knocking tendency in spark ignition engines may be decreased by Reducing the compression ratio Controlling the exhaust temperature Controlling the ignition timing Controlling the air-fuel mixture TRUE ANSWER : ? YOUR ANSWER : ?
The object of supercharging the engine is To increase the power output of an engine when greater power is required To reduce space occupied by the engine All of these To reduce mass of the engine per brake power TRUE ANSWER : ? YOUR ANSWER : ?
A petrol engine has compression ratio from 25 to 40 6 to 10 15 to 25 10 to 15 TRUE ANSWER : ? YOUR ANSWER : ?
The accumulation of carbon in a cylinder results in increase of Volumetric efficiency Clearance volume Ignition time Effective compression ratio TRUE ANSWER : ? YOUR ANSWER : ?
The normal heptane (C₇Hâ‚₆) is given a rating of ________ octane number. 100 50 120 TRUE ANSWER : ? YOUR ANSWER : ?
If the temperature of intake air in internal combustion engine increases, then its efficiency will Remain same Decrease Increase None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed. Half Four times Double Same TRUE ANSWER : ? YOUR ANSWER : ?