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bob jones

bob j.

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Viewed Questions

A stationary gas-turbine power plant operates on an ideal regenerative Brayton cycle $(\epsilon=100$ percent $)$ with air as the working fluid. Air enters the compressor at $95 \mathrm{kPa}$ and $290 \mathrm{~K}$ and the turbine at $880 \mathrm{kPa}$ and $1100 \mathrm{~K}$. Heat is transferred to air from an external source at a rate of $30,000 \mathrm{~kJ} / \mathrm{s}$. Determine the power delivered by this plant $(a)$ assuming constant specific heats for air at room temperature and ( $b$ ) accounting for the variation of specific heats with temperature.

A stationary gas-turbine power plant operates on an ideal regenerative Brayton cycle $(\epsilon=100$ percent $)$ with air as the working fluid. Air enters the compressor at $95 \mathrm{kPa}$ and $290 \mathrm{~K}$ and the turbine at $880 \mathrm{kPa}$ and $1100 \mathrm{~K}$. Heat is transferred to air from an external source at a rate of $30,000 \mathrm{~kJ} / \mathrm{s}$. Determine the power delivered by this plant $(a)$ assuming constant specific heats for air at room temperature and ( $b$ ) accounting for the variation of specific heats with temperature.

Thermodynamics: An Engineering Approach

Consider a steam power plant that operates on a reheat Rankine cycle and has a net power output of $80 \mathrm{MW}$ Steam enters the high-pressure turbine at $10 \mathrm{MPa}$ and $500^{\circ} \mathrm{C}$ and the low-pressure turbine at $1 \mathrm{MPa}$ and $500^{\circ} \mathrm{C}$. Steam leaves the condenser as a saturated liquid at a pressure of $10 \mathrm{kPa} .$ The isentropic efficiency of the turbine is 80 percent, and that of the pump is 95 percent. Show the cycle on a $T-s$ diagram with respect to saturation lines, and determine (a) the quality (or temperature, if superheated) of the steam at the turbine exit, $(b)$ the thermal efficiency of the cycle, and $(c)$ the mass flow rate of the steam.

Consider a steam power plant that operates on a reheat Rankine cycle and has a net power output of $80 \mathrm{MW}$ Steam enters the high-pressure turbine at $10 \mathrm{MPa}$ and $500^{\circ} \mathrm{C}$ and the low-pressure turbine at $1 \mathrm{MPa}$ and $500^{\circ} \mathrm{C}$. Steam leaves the condenser as a saturated liquid at a pressure of $10 \mathrm{kPa} .$ The isentropic efficiency of the turbine is 80 percent, and that of the pump is 95 percent. Show the cycle on a $T-s$ diagram with respect to saturation lines, and determine (a) the quality (or temperature, if superheated) of the steam at the turbine exit, $(b)$ the thermal efficiency of the cycle, and $(c)$ the mass flow rate of the steam.

Thermodynamics: An Engineering Approach

Oceans, seas, and bays represent about 96.5$\%$ of Earth's water, including the water found in our atmosphere. If the volume of the water contained in oceans, seas, and bays is about $321,000,000$ cubic miles, which of the following best represents the approximate volume, in cubic miles, of all the world's water? $$ \begin{array}{l}{\text { (A) } 308,160,000} \\ {\text { (B) } 309,765,000} \\ {\text { (C) } 332,642,000} \\ {\text { (D) } 334,375,000}\end{array} $$

Oceans, seas, and bays represent about 96.5$\%$ of Earth's water, including the water found in our atmosphere. If the volume of the water contained in oceans, seas, and bays is about $321,000,000$ cubic miles, which of the following best represents the approximate volume, in cubic miles, of all the world's water? $$ \begin{array}{l}{\text { (A) } 308,160,000} \\ {\text { (B) } 309,765,000} \\ {\text { (C) } 332,642,000} \\ {\text { (D) } 334,375,000}\end{array} $$

Questions asked

INSTANT ANSWER

By double integration method, moment-area method and Macaulay's method, find the slope and deflection at point of \( 50 \mathrm{kN} \) concentrated load, and at Midspan and also determine the maximum deflection. Take \( \mathrm{E}=200,000 \mathrm{MPa} \)

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INSTANT ANSWER

A cantilever, of span \( 5 \mathrm{~m} \), carries loads as shown in Fig. below. Draw the \( \mathrm{SF} \) and BM diagrams for the beam.

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ANSWERED

Aarya B verified

Numerade educator

A compound shaft is made of an aluminium rod, 40 mm diameter, and 1 m long, and a steel rod, 20 mm diameter, and 1.5 m long. If the maximum permissible shear stresses in aluminium and steel are 40 MPa and 90 MPa, and G is 28 GPa and 85 GPa, respectively, find the maximum torque that can be applied as shown. Also find the angle of twist between A and B.

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