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1) The steady-flow, reversible work equation wrev=-v(P2-P1)-delta pe-delta ke applies toa. any substanceb. only compressible substance like steelc. only compressible substances like liquid waterd. only compressible substance like air
2) For the conveyance of a given mass of fluid between two pressures, the work input to a compressor can be reduceda. increasing the inlet temperatureb. converting the gas or vapor to a liquidc.maintaining isothermal conditions through intercoolingd. maintaining adiabatic conditions through insulation
3) Isentropic efficiency is also calleda. thermal efficiencyb. second law efficiencyc. coefficient of performance efficiencyd. adiabatic efficiency
4) A typical isentropic is also calleda. less than 50%b. 50 to 70%c. 70 to 90%d. Greater than 90%
5) Isothermal efficiency appliesa. Turbinesb. pumps or compressorsc. nozzle or diffusersd. nothing, there is no such thing called an isothermal efficiency
6) The entropy generation term (Sgen)a. Represents the entropy generated within the system boundaryb. represents the entropy generated outside the system boundaryc. does not depend on the system boundaryd. only includes entropy transported across the system boundary
write a paper on boyles law and describe compression and combustion stroke . also explain charless law and illustrate
consider a magnet moving in a coil of n turns. this system can be modelled as mass spring damper system. the damping
why is communication with the customer so important? explain the twin dangers of making many changes or not enough
in this piston-cylinder device d1 20 cm-diameter d2 10 cm-diameter and the initial volume of chamber 2 is 0.1 m3.
heat in the amount of 500kj is transferred directly from a hot reservoir at 727oc to a cold reservoir at 327oc.
Assume a diffusion coefficient of 1 × 10-8 m2/s, that the concentrations at the high- and low-pressure sides of the plate are 2.4 and 0.6 kg of hydrogen per cubic meter of palladium, and that steady-state conditions have been attained.
1. for the connection shown in figure assuming the bolts are frac34- in. diameter and the angle and plate astm a36
the steel bar has the orginal dimensions shown in the third figure below. if it is subjected to an axial load of 50kn
a vapor-compression refregeration i.e. reverse rankine system circulates refrigerant 134a at a rate of 6kgmin. the
A layer of water seperates two smooth surfaces a distance of 2r. Derive an experssion for the force needed to pul the two surfaces apart. Consider the bottom surface fixed. What is the force needed to seperate the top surface?
a cylindrical specimen of a brass alloy 10.0 mm 0.39 in. in diameter and 120.0 mm 4.72 in. long is pulled in tension
a a rigid tank containing 20 kg of refrigerant 134a as saturated vapor at 1.0 bars and -26.43 c is heated until the
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