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1) A gas turbine has an overall pressure ratio of 5;11 and a maxi¬mum cycle temperature of 550°C. The turbine drives the compressor and an electric generator, the mechanical efficiency of the drive being 97%. The ambient temperature is 20`C and the isentropic efficiencies of the compressor and turbine are 0.8 and 0.83 respectively. Calculate the power output in kilowatts for an air flow of 15 kgjs. Calculate also the thermal efficiency and the work ratio. Neglect changes in kinetic energy, and the loss of pressure in the combustion chamber.
2) In a marine gas turbine unit a high-pressure stage turbine drives the compressor, and a low-pressure stage turbine drives the propeller through suitable gearing. The overall pressure ratio is 4/1, and the maximum temperature is 650°C. The isentropic efficiencies of the compressor, H.P. turbine, and L.P. turbine, are 0-8, 0.83, and 0.85 respectively, and the mechanical efficiency of both shafts is 98%. Calculate the pressure between turbine stages when the air intake conditions are 1.01 bar and 25°C. Calculate also the thermal effi-ciency and the shaft power when the mass flow is 60 kg/s. Neglect kinetic energy changes, and the pressure loss in combustion.
3) For tae unit of problem 2, calculate the thermal efficiency obtainable when a heat exchanger is fitted. Assume a thermal ratio of 0-75. (23.4%)
A radio channel has a bandwidth of 10 KHz and a SNR of 15 dB. What is the maximum data rate that can be transmitted: (a) Using any system (b) Using a code with 64 possible states
Derive the expression for maximum torque (show all steps) and show that the slip at which maximum torque occurs is directly proportional to rotor resistance, but the maximum torque is independent of rotor resistance.
A clever student notices that a high constant loop gain would make the PLL converge in frequency and phase. Rather than use an amplifier with infinite gain the student decides to just use an unstable filter.
(a) list the minterms and maxterms of each function (b) list the minterms of ~E and then ~F (c) list the miinterms of E+F and then E.F (d) express E and then F in sum-of-minterms algebraic forms
1) Compute the average power dissipated through the resistor 2) compute RMS voltage across the resistor 3) compute V RMS^2/R. 4) prove that P avr=V RMS62/R for any periodic voltage waveform
A three phase bridge rectifier has a purely resistive load of R= 100 ohm and is supplied from a 280 V, 60 Hz supply. The primary and the secondary of the input transformer are connected in Y. Determine the average output voltage of the rectifier
The other one is ON when the light sensor sees 10% more brightness than the left sensor. The third one goes ON if the brightness at the left sensor is in the range of -+10% of the right-light sensor.
Design a V antenna with arm length L=6λ at the frequency 18 MHz , namely find the V angle in degrees , find the beamwidth between nulls. if the frequency changes to 12 MHz , by how many degrees will the peak radiation direction rotate
The following functions describe the oscillations in electric circuits and the vibrations of machines and structures. Plot these functions on the same plot. Because they are similar decide how best to plot and label them to avoid confusion.
A sample of vinegar is 4.8% acetic acid, HC2H3O2, by weight, andhas a density of 1.00g/mL. Calculate (a) the grams of acetic acidin 1 liter of vinegar (b) the molarity of acetic acid invinegar.
Given a high or low pass RC or RL filter, indentify circuit characteristics such as AV, AVdB, AP, APdB, ZT, XT, and delete text at FC.
A CG amplifier when fed with a signal source having Rsig = 200 ohms is found to have an overall voltage gain of 10V/V. When a 200 ohm resistance is added in series with the signal generator the overall voltage gain decreased to 8V/V.
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