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Ksivusya [100]
3 years ago
14

In a diesel engine, the fuel is ignited by (a) spark (c) heat resulting from compressing air that is supplied for combustion (d)

ignition (e) combustion chamber. (b) injected fuel
Engineering
1 answer:
-Dominant- [34]3 years ago
7 0

Answer:

(c) heat resulting from compressing air that is supplied for combustion

Explanation:

In a diesel engine the combustion of the fuel takes place due to the adiabatic compression which leads to elevated temperatures in the cylinder. First the air is compressed by the piston in the cylinder which raises the temperature, then the atomized fuel is put in the cylinder causing the ignition of fuel. Diesel engines have the highest thermal efficiency.

Spark causes ignition in petroleum engine.

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Which sentence is correct about the exergy of an empty (pressure around zero Pascal) tank with a volume of V, located in an envi
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The correct option is;

c.  the exergy of the tank can be anything between zero to P₀·V

Explanation:

The given parameters are;

The volume of the tank = V

The pressure in the tank = 0 Pascal

The pressure of the surrounding = P₀

The temperature of the surrounding = T₀

Exergy is a measure of the amount of a given energy which a system posses that is extractable to provide useful work. It is possible work that brings about equilibrium. It is the potential the system has to bring about change

The exergy balance equation  is given as follows;

X_2 - X_1 = \int\limits^2_1 {} \, \delta Q \left (1 - \dfrac{T_0}{T} \right ) - [W - P_0 \cdot (V_2 - V_1)]- X_{destroyed}

Where;

X₂ - X₁ is the difference between the two exergies

Therefore, the exergy of the system with regards to the environment is the work received from the environment which at is equal to done on the system by the surrounding which by equilibrium for an empty tank with 0 pressure is equal to the product of the pressure of the surrounding and the volume of the empty tank or P₀ × V less the work, exergy destroyed, while taking into consideration the change in heat of the system

Therefore, the exergy of the tank can be anything between zero to P₀·V.

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