Engineering, 12.06.2020 21:57 ericv6796
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: 2
Engineering, 04.07.2019 18:20, rbgrh9465
An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.
Answers: 3
Engineering, 04.07.2019 19:10, gabrielaperezcz
Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?
Answers: 3
Engineering, 04.07.2019 19:10, rayne40
A)-in the process of engineering design, explain the contribution of material selection. b)- explain the procedure of synthesis as is employed in engineering design. c)- is there any relationship between ergonomics and engineering design? explain. d)- safety consideration in engineering design includes human, product and the enviroment . explain how safety will be incorporated into the design?
Answers: 3
Q1. A 3.phase full wave controlled rectifier is fed from 3-phase, 400V,50HZ source and is
connected...
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