The correct operating sequence of a 4-stroke cycle internal combustion engine is

Question

The correct operating sequence of a 4-stroke cycle internal combustion engine is (A) Intake, Compression, Combustion, Expansion, Exhaust (B) Compression, Expansion, Intake, Exhaust (C) Throttling, Intake, Exhaust, Combustion (D) Compression, Expansion, Throttling, Combustion, Exhaust

The pressure of an ideal gas drops significantly as it flows under steady state conditions through an insulated throttle valve. Which of the following does not remain constant (A) Temperature (B) Specific internal energy (C) Specific enthalpy (D) Specific entropy

A closed cylinder with an internal volume of 0.28 m 3 contains Nitrogen (N2) gas (M = 28.0 kg•kmol-1) at 28oC and at an absolute pressure of 280 kPa. Assuming ideal gas behaviour, what will be the mass of N2? (A) 0.28 kg (B) 1.0 kg (C) 9.48 kg (D) 0.877 kg

Explanation / Answer

-Operating sequence of four stroke ic engine is intake, compression. Combustion, expansion,exhaust so option A is correct.

-option D is corrct specific entropy varies because in case of throattling temperature remains constant in case of ideal gas.

- PV=MRT

280*0.28=M(8.314/28)(28+273)

M=0.87719kg so option D is correct

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