Problem_Solving_01

Jacky Shane Luyas Buhia · 20問 · 2年前

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問題一覧

If air is at a pressure of 22.2 psia and at temperature of 800 °R then calculate its specific volume.

B. 13.3 ft³/lbm

A 10 kg block is raised vertically 3 meters. Calculate the change in its potential energy.

A. 294 J

An ideal gas is 45 psig and 80°F is heated in a closed container to 130°F. What is the final pressure?

B. 65 psia

A closed vessel contains air at a pressure of 160 kN/m² gauge and temperature of 30°C. The air is heated at constant volume to 60°C with the atmospheric pressure of 759 mmHg. What is the final gauge pressure?

B. 186

Calculate the work required to accelerate an 800-kg car from test to 100 km/hr on a level road.

A. 308.6 kJ

Determine the average Cp value in kJ/kg-K of a gas if 522 kJ of heat is necessary to raise the temperature from 300 K to 800 K making the pressure constant.

B. 1.044

A transportation company specializes in the shipment of pressurized gaseous materials. An order is received from 100 liters of a particular gas at STP (32°F and 1 atm). Compute the minimum volume tank that is necessary to transport the gas at 80°F and maximum pressure of 8 atm?

C. 14 liters

Steam flows into a turbine at the rate of 10 kg/s and 10 kW of heat are lost from the turbine. Ignoring elevation and kinetic energy effects, calculate the power output from the turbine. Note: h1 = 2739.0 kJ/kg and h2 = 2300.5 kJ/kg

C. 4375 kW

A Carnot engine requires 35 kJ/s from the hot source. The engine produces 15 kW of power and the temperature of the sink is 26°C. What is the temperature of the hot source in °C ?

C. 250.25

Air is compressed adiabatically from 30°C to 100°C. If mass of air being compressed is 5 kg. Find the change in entropy.

C. 0

Calculate the resulting pressure when one pound of air at 15 psia and 200°F is heated at constant volume to 800°F ?

B. 28.6 psia

What is the thermal efficiency of a Carnot cycle operating between 170°C and 620°C ?

C. 50 %

Find the enthalpy of 1 kg of wet saturated steam at a pressure of 0.20 bar and dryness fraction of 0.85. At 0.20 bar, hf = 251 kJ/kg, hfg = 2358 kJ/kg

C. 2255.30 kJ/kg

A spherical balloon with a diameter of 6 m is filled with helium at 20 deg C and 200 kPa. What is the mole number?

A. 9.28 kmol

The temperature of 4.82 lb of Oxygen occupying at 8 ft³ is changed from 110°F to 200°F while pressure remains constant at 115 psia. Determine the final volume.

C. 9.26 ft³

A heat engine has a thermal efficiency of 50%. Compute the power does the engine produce when heat is transferred at a rate of 10⁹ kJ/hr?

C. 139 MW

Air at 300°K and 200 kPa is heated at constant pressure to 600°K. Calculate the change of internal energy.

D. 215.58 kJ/kg

In an isentropic process, P1 = 200 psi, P2 = 300 psi and T1 = 700°R. Find T2 using k = 1.4.

C. 786°R

Determine the change in enthalpy per lb of mass of nitrogen gas as its temperature changes from 500°F to 200°F. (Cp = 0.2483 BTU/lbm°R)

A. - 74.49 BTU/lbm

Wet saturated steam at 17 bar (hf = 872 kJ/kg, hfg = 1923 kJ/kg) dryness 0.97 is produced from feedwater at 85°C (h = 355.9 kJ/kg). Find the heat energy supplied per kg.

C. 2381.41 kJ/kg

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