Importance of civil engineering in nepal?

A dc shunt generator rated at 85 kW produces a voltage of 280 V. The brush voltage drop is 2.5 V, and the armature and field res

dalvyx [7]

Answer:

(a) Calculate the field, armature, and load currents versus load = 306A

(b) Determine the terminal voltage at no-load and at rated load conditions = 300V

(c) Calculate the voltage regulation of the generator. Use the no-load voltage as the base value = 6.67%

(d) Plot the terminal voltage as a function of the load. Determine the load that corresponds to a 5% voltage drop using the no-load voltage as the base = 294.74V

Explanation:

CHECK THE ATTACHED FILES FOR DETAILED EXPLANATION.

3 0

3 years ago

1). Patient people are physically healthier than non-patient people. True False

Ede4ka [16]

Answer:false\

Explanation:

6 0

4 years ago

A 2 m3 insulated rigid tank contains 3 kg of nitrogen at 90 kPa. Now work is done on the system until the pressure in the tank r

Nutka1998 [239]

Answer: $\Delta S$ = 1.47kJ/K

Explanation: Entropy is the measure of a system's molecular disorder, i.e, the unuseful work a system does.

The nitrogen gas in the insulated tank can be described as an ideal gas, so it can be used the related formulas.

For the entropy, the ratio of initial and final temperatures is needed and as volume is constant, we use:

$\frac{P_{1}}{T_{1}} =\frac{P_{2}}{T_{2}}$

$\frac{P_{2}}{P_{1}} =\frac{T_{2}}{T_{1}}$

$\frac{T_{2}}{T_{1}} =\frac{175}{90}$

$\frac{T_{2}}{T_{1}} =1.94$

Specific Heat is the quantity of heat required to increase the temperature 1 degree of a unit mass of a substance. Specific heat of nitrogen at constant volume is $c_{v}=$ 0.743kJ/kg.K

The change in entropy is calculated by

$\Delta S= m[c_{v}ln(\frac{T_{2}}{T_{1}})-Rln(\frac{V_{2}}{V_{1}} )]$

For the nitrogen insulated in a rigid tank:

$\Delta S= m[c_{v}ln(\frac{T_{2}}{T_{1}})]$

Substituing:

$\Delta S= 3[0.743ln(1.94)]$

$\Delta S=$ 1.47

The entropy change of nitrogen in an insulated rigid tank is 1.47kJ/K

6 0

3 years ago

Using the Tsai-Hill failure criterion, determine the strength of a lamina under equal biaxial tension and shear at 45o to the fi

Alinara [238K]

Answer:

Explanation:

solution to the question

5 0

3 years ago

Which of the following Python lines calculates the standard deviation of variables Exam1 and Exam4 from a CSV file called ExamSc

Virty [35]

Answer:

The option B calculates the standard deviation of variables Exam1 and Exam4.

Explanation:

First, let's write the first two lines correctly:

import pandas as pd
scores = pd.read_csv('ExamScores.csv')

Now, let's analyse each option:

- The option A is incorrect

The expression std[['Exam1','Exam4']] is the incorrect part because in this case std is working as a variable and the std was not previously declared. So it will generate an error.

- The option C is incorrect

The expression std[['Exam1','Exam4']].scores() is incorrect because of two reasons: first, std is working as a variable and the std was not previously declared (as in option A), second, .scores() is working as a method and in this case, scores is the variable. So it will generate an error.

- The option D is incorrect

The expression [['Exam1']] is the incorrect part because it doesn't include the 'Exam4' and the problem is asking for the standard deviation of variables Exam1 and Exam4.

- The option B is CORRECT

The expression std[['Exam1','Exam4']] refers to the variables Exam1 and Exam4 from the total exams. As scores is a pandas variable and .std() is a method provided by pandas library, the expression .std() allows to get the deviation standard of the variables Exam1 and Exam4.

Thus, the option B calculates the standard deviation of variables Exam1 and Exam4.

4 0

3 years ago

Importance of civil engineering in nepal?​

Importance of civil engineering in nepal?