Homework Answers
1. Load should be disconnected / anode current should drop below a threshold current (Holding current, typically zero). Hence the forward anode current should be brought to zero for a sufficient time.
2. Sufficient reveres bias voltage should be applied for a sufficient time for it to recover the holding state.
Add Answer to:
(b): (10 marks) Which conditions should be met for successful turn-off of a thyristor, and for...
How to turn-on and turn-off thyristor (SCR)? How to turn-on and turn-off power MOSFET?
How to turn-on and turn-off thyristor (SCR)? How to turn-on and turn-off power MOSFET?
of a) What are the sources of losses for semiconductors devices? (2 Marks) b) A thyristor...
of a) What are the sources of losses for semiconductors devices? (2 Marks) b) A thyristor with a steady power loss of 300 has a junction to heatsink thermal resistance of 0.7°C/W. Determine the maximum value of the thermal resistance the heatsink can have if the ambient temperature is or and the junction temperature is limited to 125 C. Give the heatsink femperature at these conditions. Marks) c) The thyristor in the switching circuit of following figure has rating of...
e. 95% of 100 QUESTIONS Switch Selection turn on and turn off control Power dextronics Circuit...
e. 95% of 100 QUESTIONS Switch Selection turn on and turn off control Power dextronics Circuit function by using semiconductor devices as watches, thereby controlling or modifying a voltage or current When these devices (eg diodes, thystors, transtors, etc) are Operated as a match they are characterized by having the two Bateson and deally being ther a short circuitor an open Circuit One basic d ance between the power electronic uching dences is how they are tumed on and off,...
(i) (ii) Draw the structural diagram of a Gate Turn-Off (GTO) thyristor. [7%] Explain the operation...
(i) (ii) Draw the structural diagram of a Gate Turn-Off (GTO) thyristor. [7%] Explain the operation of GTO and clearly state the voltage and frequency range for its application [15%] State four advantages of GTOs when compared to conventional thyristors. (iii) [8%] (b) Consider the single-phase full bridge rectifier shown below where R=6 12, L = 6 mH, E = 60 V and the ac source voltage is 230 V, 50 Hz. * * 13 பண்பு 14* (i) For continuous...
You need to make a motor turn on and turn off for the following conditions: If...
You need to make a motor turn on and turn off for the following conditions: If the operator wants it to start and run continuously until he stops it If the operator wants it to start and stop based on a pressure. Start it at 10psi, stop it 30psi. Draw the motor control schematic for hardwired relay control using pressure switches Draw the PLC ladder logic diagram using pressure switches as digital inputs
10 Successful in this position? Which of the following interview questions should not be used in...
10 Successful in this position? Which of the following interview questions should not be used in Tell me about yoursel When did you move to the United States? Are you eligible to work in this state? d. Why would you be successful in this position? c. Band C Which of the following interview questions should not be asked in an interview Tell me about your educational experience b. Can you perform the essential job functions of a medical with or...
Q.A4 (a) Identify and describe eight significant business reasons why a manufacturing company should reassess robotic technology. 4 marks) (b) A workcell comprises a CNC mill/turn centre integrated w...
Q.A4 (a) Identify and describe eight significant business reasons why a manufacturing company should reassess robotic technology. 4 marks) (b) A workcell comprises a CNC mill/turn centre integrated with a robotic arm for part loading, unloading and palletising. Describe a typical robot configuration suitable for this task. Clearly label and identify all key components of the robot. (4 marks) (c) Describe the theory and application of a robotic vision control system and two other sensor technologies typically integrated into a...
b. Consider the single-phase fully controlled of thyristor bridge rectifier supplies a load consists of R-L...
b. Consider the single-phase fully controlled of thyristor bridge rectifier supplies a load consists of R-L load and Vee in series as shown in Figure Q2 (b). The parameters for this circuit are as follows: supply voltage is 120 Vrms at 60 Hz, DC voltage, Voe equal to 10 v. i. Sketch the waveforms for output voltage, thyristor current, diode current and output current (CO2: PO2 - 5 marks) Calculate the output voltage, Va at a = Tt/2. (CO2: PO2...
Determine if the capacitor bank should be switched on or off.
For the two-bus system shown in diagram below, bus 1 is the reference (slack) bus with \(\left|\mathrm{V}_{1}\right|=1.00\) and \(\delta_{1}=0.0^{\circ} .\) At bus \(2,\) the active load is \(4.3 \mathrm{p} . \mathrm{u} .\) and the reactive load is \(-0.63 \mathrm{pu}\) and the line admittance is \(\mathrm{y}_{12}=1\) - \(j 10\) p.u. as shown in the figure. The voltage at bus 2 is to be maintained between 0.95 and 1.05 p.u.
a) Determine if the capacitor bank should be switched on or off....
A single-phase full bridge thyristor rectifier is supplied from a 200vrm 50HZ AC source, and supplies...
A single-phase full bridge thyristor rectifier is supplied from a 200vrm 50HZ AC source, and supplies a series R-L load comprising a 202 resistance and a 36.8mH inductance 2.a. Sketch the circuit diagram for this rectifier Q2. [4 marks] [Refer to lecture notes] 2.b. Determine the maximum possible average DC voltage that can be achieved across the load resistor [4 marks] [VDC (avg) = 180V] 2.c. Determine the SCR firing angle at which the rectified output curent will just be...
of a) What are the sources of losses for semiconductors devices? (2 Marks) b) A thyristor with a steady power loss of 300 has a junction to heatsink thermal resistance of 0.7°C/W. Determine the maximum value of the thermal resistance the heatsink can have if the ambient temperature is or and the junction temperature is limited to 125 C. Give the heatsink femperature at these conditions. Marks) c) The thyristor in the switching circuit of following figure has rating of...
e. 95% of 100 QUESTIONS Switch Selection turn on and turn off control Power dextronics Circuit function by using semiconductor devices as watches, thereby controlling or modifying a voltage or current When these devices (eg diodes, thystors, transtors, etc) are Operated as a match they are characterized by having the two Bateson and deally being ther a short circuitor an open Circuit One basic d ance between the power electronic uching dences is how they are tumed on and off,...
(i) (ii) Draw the structural diagram of a Gate Turn-Off (GTO) thyristor. [7%] Explain the operation of GTO and clearly state the voltage and frequency range for its application [15%] State four advantages of GTOs when compared to conventional thyristors. (iii) [8%] (b) Consider the single-phase full bridge rectifier shown below where R=6 12, L = 6 mH, E = 60 V and the ac source voltage is 230 V, 50 Hz. * * 13 பண்பு 14* (i) For continuous...
10 Successful in this position? Which of the following interview questions should not be used in Tell me about yoursel When did you move to the United States? Are you eligible to work in this state? d. Why would you be successful in this position? c. Band C Which of the following interview questions should not be asked in an interview Tell me about your educational experience b. Can you perform the essential job functions of a medical with or...
Q.A4 (a) Identify and describe eight significant business reasons why a manufacturing company should reassess robotic technology. 4 marks) (b) A workcell comprises a CNC mill/turn centre integrated with a robotic arm for part loading, unloading and palletising. Describe a typical robot configuration suitable for this task. Clearly label and identify all key components of the robot. (4 marks) (c) Describe the theory and application of a robotic vision control system and two other sensor technologies typically integrated into a...
b. Consider the single-phase fully controlled of thyristor bridge rectifier supplies a load consists of R-L load and Vee in series as shown in Figure Q2 (b). The parameters for this circuit are as follows: supply voltage is 120 Vrms at 60 Hz, DC voltage, Voe equal to 10 v. i. Sketch the waveforms for output voltage, thyristor current, diode current and output current (CO2: PO2 - 5 marks) Calculate the output voltage, Va at a = Tt/2. (CO2: PO2...
A single-phase full bridge thyristor rectifier is supplied from a 200vrm 50HZ AC source, and supplies a series R-L load comprising a 202 resistance and a 36.8mH inductance 2.a. Sketch the circuit diagram for this rectifier Q2. [4 marks] [Refer to lecture notes] 2.b. Determine the maximum possible average DC voltage that can be achieved across the load resistor [4 marks] [VDC (avg) = 180V] 2.c. Determine the SCR firing angle at which the rectified output curent will just be...
Most questions answered within 3 hours.
-
if we subtract 1000 from 0001 is there overflow? (binary)
asked 1 minute ago -
Hello, I need help with the function below, The language I am
using is Ocaml
open...
asked 2 minutes ago -
Explain how the presence of glucose represses the gal structural
genes?
asked 10 minutes ago -
For the reaction CaI2+2AgNO3⟶2AgI+Ca(NO3)2 how many grams of
silver iodide, AgI, are produced from 56.5 g...
asked 21 minutes ago -
Write an equation for hydrolysis via acid catalysis.
Using ethyl acetate, ethyl benzoate, ethyl formate or...
asked 29 minutes ago -
Only one graph is needed.
(a) Draw a Supply Curve and the Demand Curve for the...
asked 32 minutes ago -
Fill in the blanks and please show how you arrived at numerical
answers
. The...
asked 32 minutes ago -
91. If the half – life of a sample of radioactive
material is 60 days, what...
asked 39 minutes ago -
White light (380nm-750nm) strikes a diffraction grating (420
lines/mm) at normal incidence. What is the highest-order...
asked 49 minutes ago -
1) Explain what is meant by a good being "excludable."?
2) Explain what is meant by...
asked 48 minutes ago -
I need help with this question:
Describe in detail at least two factors that stimulated American...
asked 55 minutes ago -
Calculate the Boyle temperature for helium assuming it follows
the Berthelot equation of state.
asked 56 minutes ago