Energy Cycle

·         In an automobile engine the temperature of the piston will be more at

Answer: The crown of the engine experiences the highest temperature.

·         The firing order in case of four cylinder inline engines is usually

Answer The firing order of these engines can be either 1-3-4-2 or 1-4-3-2.

·         In case of four cylinder opposed cylinder engines the firing order is

Answer: The firing order in these engines is 1-4-3-2.

·         In case of four cylinder inline engine the number of firing strokes in one revolution of crank is

Answer: In a four cylinder engine the number of firing strokes for one revolution of crank is two.

·         In four cylinder engines the ignition advance depends on

Answer: Ignition advance depends on both quality of fuel and engine speed.

·         Ignition advance is expressed in terms of

Answer: Ignition advance can be expressed in terms of any of the following.

·         In internal combustion engine the approximate percentage of the combustion heat that passes to the cylinder walls is

Answer: Approximately 30% of heat passes to the cylinder walls.

·         In a four stroke S.I engine the exhaust valve usually opens

Answer: Exhaust valve opens at 35 degree to 60 degree before BDC.

·         In S.I engine the intake valve closes

Answer: The intake valve closes at 25 degree to 84 degree after BDC.

·         In a diesel engine the pressure during combustion may increase to a range at

Answer: Pressure can increase as high as 55 to 75 atm during combustion in diesel engine.

·         In a diesel engine the temperature of gases under full load may be of the order of

Answer: Temperature under full load may be as high as 550 to 650 degree Celsius.

·         The fuel is injected into the cylinder in diesel engine when the piston is

Answer: Fuel is injected when piston is approaching TDC during compression stroke.

·         A single cylinder four stroke engine is rotating at 2000 rpm. The number of power strokes occuring in one minute is

Answer: For every two revolutions one cylse is completed in a four stroke engine. If speed is 2000 rpm then number of complete cycles per minute is 1000.

·         The pressure in an engine cylinder is less than atmospheric pressure when the engine is performing which stroke

Answer: During suction stroke the inside pressure is less than atmospheric pressure.

·         The angle in degrees moved by the crankshaft of a four cylinder engine between firing impulses is

Answer: As engines are alternately fired so the angle moved by crankshaft decreases to 180 between firing impulses.