Engineering, 03.07.2020 04:01 KIAZTUNEZ
Q1. A 3.phase full wave controlled rectifier is fed from 3-phase, 400V,50HZ source and is
connected to load taking a constant current of 35A. (a) Draw the waveform of output
voltage. (b) Calculate average value of load voltage for a firing angle of 20°
(c) average load power,
(30 mark)
Q2. Explain with necessary equation and drawing the principle operation of the boost
chopper
(35 mark)
Q3. A square wave output single phase bridge inverter supplies an 80 resistor with 40mH
inductance load. Load fundamental rms voltage is 135V at 60Hz. Calculate:
(a) voltage of the dc supply.
(b) rms value of load voltage, load current and third harmonic voltage.
(c) Load power
(35 mark)
Answers: 3
Engineering, 04.07.2019 18:10
True or false (explain) (110)[111] is a slip system in bcc metals . the {111} family in fcc contains 8 planes. resolved shear stress (rss) in single crystals is just related to the applied stress. critical resolved shear stress (crss) in single crystal metals is direct proportional to the number of defects in the structure
Answers: 2
Engineering, 04.07.2019 18:20
Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?
Answers: 3
Engineering, 04.07.2019 19:10
How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?
Answers: 2
Engineering, 04.07.2019 19:10
The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false
Answers: 2
Q1. A 3.phase full wave controlled rectifier is fed from 3-phase, 400V,50HZ source and is
connected...
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