1- Classify the power switches according to the ability to control

2- What are the conditions of turning on the thyristor. State the methods of turning it off. What is the main difference between thyristors and GTO

3- Describe the behavior of TRIAC

4- Derive the expressions of the average load voltage and current in single-phase half-wave controlled rectifiers and resistive load. Draw the waveforms of supply voltage, output voltage, output current, thyristor voltage and thyristor current

5- In a single-phase half-wave controlled rectifier and resistive load, it is desired to get an average load voltage of 80 V. Determine the firing angle if the ac supply voltage is 220 V. If the load resistance is 30 Ω, calculate the average load current and design the thyristor. The volt-drop across the device Von during conduction is 2V. Determine the average conduction losses.

6- In a single-phase half-wave controlled rectifier and R-L load it was found that conduction angle of the thyristor is 160o when the firing angle is 50o. Calculate the average load voltage if the circuit is supplied from a 140 V ac source. Draw the waveforms of supply voltage, output voltage, output current and thyristor voltage.

7- In a single-phase half-wave rectifiers with R-L load and a freewheeling diode FWD, calculate the average load voltage if the firing angle is 30o and the supply voltage is 150 V. Draw the waveforms of supply voltage, output voltage, load current, thyristor current, FWD current and thyristor current.

8- Derive the expressions of the average load voltage and current in single-phase full-wave controlled rectifier with center tapped transformer and resistive load. Draw the waveforms of supply voltage, output voltage, output current, and thyristor current.

9- In a single-phase full-wave controlled rectifier with center tapped transformer and resistive load, it is desired to get an average load voltage of 140 V. Determine the firing angle if the ac supply voltage is 200 V. If the average load power is 700 W, calculate the average load current and design the thyristor. The volt-drop across each thyristor Von during conduction is 1.8V. Determine the average conduction losses of the thyristors.

10- Derive the expressions of the average load voltage and current in single-phase full-wave controlled rectifier (bridge rectifier) and resistive load. Draw the waveforms of supply voltage, output voltage, output current and thyristor current.

11- In a single-phase full-wave controlled rectifier (bridge rectifier) and resistive load, it is desired to get an average load voltage of 50 V. Determine the firing angle if the ac supply voltage is 150 V. If the average load power is 300W, calculate the average load current and. Design the thyristor.

12- Derive the expressions of the average load voltage in single-phase full-wave controlled rectifier (bridge rectifier) and highly inductive load. Draw the waveforms of supply voltage, output voltage, output current and thyristor current.

13- In a single-phase full-wave controlled rectifier (bridge rectifier) and resistive load, it is desired to get an average load voltage of 90 V. Determine the firing angle if the ac supply voltage is 230 V. If the average load power is 270 W, calculate the load current and. Design the thyristor.

14- The single-phase half wave rectifier has a purely resistive load of R and the delay angle is α=π/2, determine: ??? , ??? , ????, ????.
Plot : Is , Vs , VL , VT , Ig

1. Bethesda Mining Company reports the following balance sheet information for 2015 and 2016.

Based on the balance sheets given for Bethesda Mining, calculate the following financial ratios for each year:

a. Current ratio. (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)

b. Quick ratio. (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)

c. Cash ratio. (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)

d. Debt−equity ratio and equity multiplier. (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)

e. Total debt ratio. (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.)

2. Some recent financial statements for Smolira Golf, Inc., follow.

Find the following financial ratios for Smolira Golf (use year-end figures rather than average values where appropriate): (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16. Enter the profitability ratios as a percent.)

In Java please:

3.39 Lab 6e: CharacterOps

Write a program that prompts the user to enter their first name. Say hello to the person. Then display whether their name begins with a vowel or consonant.
If it is neither, perhaps a special character or a number digit, then print neither a vowel nor a consonant.

Example 1:

Enter your first name:  Barbara
Hello, Barbara!
The first letter of your name, 'B', is a consonant.

Example 2:

Enter your first name:  Elizabeth
Hello, Elizabeth!
The first letter of your name, 'E', is a vowel.

Example 3:

Enter your first name:  !Sam
Hello, !Sam!
The first letter of your name, '!', is a is neither a vowel nor a consonant.

Java's Character class provides a method isAlphabetic() which may assist your coding effort.

Suppose we have char ch = 'm'; then Character.isAlphabetic(ch) would return true.
Likewise, Character.isAlphabetic('&') would return false.

This is all in Python. Also, the names come from a .txt file that i have created with 3 names on it(Jim,Pam,Dwight).

Main Function. Write a program where the user enters a name. Using the read function, check to see if the name is in the text document. If it is, respond back to the user the name is found within the list.

Read Function. The read function should return the contents of the text document as a list.

EXAMPLE OUTPUT
Please enter a name: Jim
Jimis found in the list.
Enter another name (Y/N): Y
Please enter a name: Andy
Sorry, Andy was not found in the list. Would you like to add it? (Y/N): Y
Andrew has been added to the list.
Enter another name (Y/N): N

Write Function. The write function should take the list and override the file with the new names list in reverse alphabetical order with a hard return after each name.

Using string functions and all other programming features discussed in the class, write a program that will prompt a user to input their name (first and last). Ex: Please enter your first and last name: John Doe Then, output the string. Next, prompt the user to input their nickname. Ex: Enter your nickname: Rowdy Then modify the name string to consist of the person’s last name comma, nickname (backwards, in all caps, enclosed in double quotes) and first name. Then output the modified string. Ex: Doe, “YDWOR” John Bonus (+10) Output first and last name alternating every two characters: John Doe Ex: JoDohne Tim Wheaterton Ex: TiWhmeaterton NOTE: This program should loop, prompting the user to decide whether or not he or she wishes to enter another name. Ex: Do you wish to enter another name(y/n)?

comment program must have getline and concatenation also in c++

write Issues, Rules, Analysis and conclusion on NLRB v. Babcock & Wilcox

what is the jurisdiction and standing for the Boeken v. Philip Morris, Inc case?

Write dt/ds with constant H in terms of T,P,V.

Contrast when the A/P and D/V axes are specified in Nematodes and Fruitflies.