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In: Mechanical Engineering

# choose the best answer: A- An ideal gas enters an adiabatic nozzle at 10 m/s and...

A- An ideal gas enters an adiabatic nozzle at 10 m/s and exits at 300 m/s. If the incoming specific enthalpy of the gas is 2,111 kJ/kg, what is the exiting specific enthalpy of the gas in kJ/kg?

Choices: 1: 2021.1 Kj/Kg , 2: 2200.9 kj/Kg , 3: 92011 Kj/Kg , -2021.2 kj/Kg.

B- A material with a specific heat, Cp, of 5 kJ/kg-K passes through an insulated turbine at 4 kg/s. The incoming temperature of the material is 100°C and the exiting temperature is 50°C. Determine the shaft work in kW.

Choices: 1: 1000 KW , 2: -1000 KW , 3: 250 KW , 4: -250 KW.

C- Which of the following statements about a well-insulated heat exchanger is false (ignoring kinetic and potential energy changes):

Choices: 1: heat is exchanged between the system and the surroundings , 2: the 2 materials do not physically mix , 3: energy is exchanged between the materials , 4: the sum of the enthalpy changes equals zero.

D- An open vat contains 1 kg of boiling ammonia at 1 bar. Calculate the time (in seconds) it takes for the vat to empty if the heat is added at a rate of 100 kW?

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As you mentioned in que that choose best option it means I have to answers only McQ type questions so I had solved first three McQ with explaination so please rate me thumbs up for the solution.

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