True or False (2pts each) 1. When a substance undergoes a throttling process thr
ID: 2086501 • Letter: T
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True or False (2pts each) 1. When a substance undergoes a throttling process through a valve the specific enthalpies of the substance at the valve inlet and the valve exit are equal. a. TRUE/FALSE 2. Conservation of energy at steady state can occur when the total rate of energy transferred into a controlled volume does not equals the total rate of energy leaving the system. . A throttling device is a device that introduces a restriction into a line to reduce the pressure of a gas or liquid 4. Volumetric flow rate is expressed in units of m2/s or ft /s 5. Transient operation involves state changes with time 6. Where mass crosses the boundary of a control volume, the accompanying energy transfer is accounted for by a. TRUE/FALSE a. TRUE/FALSE a. TRUE/FALSE a. TRUE/FALSE the internal energy of the mass only As the velocity decreases in a diffuser the pressure decreases. At steady state, identical electric fans discharging air at the same temperature in Boston (sea level) and Mexico a. TRUE/FALSE 7. a. TRUE/FALSE 8. City (mile high) will deliver the same volumetric flow rate of air a. TRUE/FALSE . A mixing chamber is a direct-contact heat exchanger a. TRUE/FALSE 10. Steady flow devices that result in a drop in working fluid pressure from inlet to exit are: Nozzle, turbine and throttling device a. TRUE/FALSEExplanation / Answer
1-true ,throttling is adiabatic irreversible process in which substance passed through a porous plug which result in constant enthalpy
2-false,conservation of energy for steady state means net amount of energy entering equal to the net amount of energy leaving the system.
3true, throttling is process of passage of fluid through restricted path like orifice or porous plug which result in decrease of pressure.
4.-true volume flow rate is amount of volume flowing per unit time.
5.-true ,transient means unsteady property varies with time.
6-false,mass cross means open system enegy stored in form of enthalpy,kinteic energy and potential energy not internal energy alone.
7.-false ,velcity decreses means pressure increases becouse total energy is constant so decrease in kintetic energy equals to increse in pressure energy.
8.-false ,becouse density will changes at both loction so volme flow will aslo changes.
9.-true,both stream of fluid are mixed.
10.-false,in nozzle increse in pressure takes place in other two pressure drop takes place.
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