What is reason for negative loop in the suction stroke of IC engine in torque vs crank angle graph?

➢ From the above expression, we see that the turning moment (T) is zero, when the crank angle (θ) is zero. It is maximum when the crank angle is 90° and it is again zero when crank angle is 180°. ➢ This is shown by the curve abc in Fig. and it represents the turning moment diagram for outstroke.

When the turning moment is positive when the engine torque is more than the mean resisting torque the crankshaft accelerates and the work is done by the steam?

1. When the turning moment is positive (i.e. when the engine torque is more than the mean resisting torque) as shown between points B and C (or D and E) , the crankshaft accelerates and the work is done by the steam.

Which one of the strokes in a 4-stroke IC engine has completely negative turning moment throughout the stroke?

During the compression stroke, work is being done on the gas, hence work being produced during combustion, is going to be consumed for compression of gas. As seen from the graph, we can conclude the in a 4-stroke IC engine, the turning moment during the compression stroke is negative throughout.

What is suction stroke in 4-stroke petrol?

The four-stroke engine cycle Suction stroke:The piston descends towards Bottom Dead Center (BDC) and the outside air pressure is equalizing the reduced in-cylinder pressure through the open intake valve. In the vicinity of TDC, the fuel-air mixture is ignited and the in-cylinder pressure is increased.

What is the significance of turning moment diagram?

Significance of Turning Moment Diagram:- It shows variation of Turning moment with respect to the crank angle of an Engine.

When engine torque is more than me in resisting torque then the flywheel?

Explanation: When the difference between T-Tmean is negative the work is done on the steam and the crankshaft decelerates which results in retardation of flywheel. In actual practice, engine is assumed to work against the mean resisting torque.

When the torque required by the machine is more than the torque supplied by the motor the flywheel is *?

accelerate
Explanation: Whenever the torque supplied by the motor is greater than the torque needed by machine, flywheel will accelerate.

When the work is done on the gases in case of four stroke engine which of the following effect is observed on the turning moment diagram?

When the work is done on the gases, which of the following effect is observed on the turning moment diagram? Explanation: When the work is done on the gases, the pressure inside the cylinder decreases and has a value lower than the atmospheric pressure, as a result a negative loop is formed. 6.

What is turning moment diagram and draw it for 4 stroke IC engine?

A turning moment diagram for a four stroke cycle internal combustion engine is shown in Fig. 16.2. We know that in a four stroke cycle internal combustion engine, there is one working stroke after the crank has turned through two revolutions, i.e. 720° (or 4 π radians).

What happens during suction stroke in 4 stroke cycle engine?

The piston is moving down as air is being sucked in by the downward motion against the piston. Compression: This stroke begins at B.D.C, or just at the end of the suction stroke, and ends at T.D.C. In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below).

What happened in suction stroke of diesel engine?

1. Suction Stroke – With pistons moving downwards and the opening of the inlet valve creates the suction of clean air into the cylinders. 2. The piston moves up resulting in compression of the air in a confined space under higher compression-ratio.