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1 year ago

What is the hardest part of engineering?

Engineering

1 answer:

Vikki [24]1 year ago

7 0

ANSWER:

Aerospace Engineering. ...

Chemical Engineering. ...

Biomedical Engineering.

EXPLANATION:

This is all i know but ... I hope this helps~

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A 230 V shunt motor has a nominal armature current of 60 A. If the armature resistance is 0.15 ohm, calculate the following: a.

hjlf

Answer:

a) $E_{b} = 221 V$

b) P = 13,800 W

c) $P_{mech} = 13260 W$

di) $I_{initial} = 1533.33 A$

dii) $R_{start} = 1.85 ohms$

Explanation:

Voltage, Vt = 230 V

Armature current, $I_{a} = 60 A$

Armature Resistance, $R_{a} = 0.15 ohms$

a) The back emf is calculated as follows:

$E_{b} = V_{t} - I_{a} R_{a} \\E_{b} = 230 - (60 * 0.15)\\E_{b} = 230 - 9\\E_{b} = 221 V$

b) The power supplied to the armature (W)

$P =V_{t} I_{a}$

P = 230 * 60

P = 13,800 W

c) Mechanical power developed by the motor

$P_{mech}$ = Power supplied to the armature - Power lost in the armature

Power lost in the armature, $P_{a} = I_{a} ^{2} R_{a}$

$P_{a} = 60^{2} *0.15\\P_{a} = 540 W$

$P_{mech} = 13800 - 540\\P_{mech} = 13260 W$

d)( i)The initial starting current if the motor is directly connected across the 230 V line

At starting, there is no back emf, $E_{b} = 0$

$V_{t} = I_{initial} R_{a}$

$230 = I_{initial} * 0.15\\ I_{initial} = 230/0.15\\ I_{initial} = 1533.33 A$

ii) Value of the starting resistor needed to limit the initial current to 115 A

$V_{t} = I_{initial} (R_{a} + R_{start})$

$230= 115 (0.15 + R_{start})\\230/115 = 0.15 + R_{start}\\2 - 0.15 = R_{start}\\ R_{start} = 1.85 ohms$

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3 years ago

Type a statement using srand() to seed random number generation using variable seedVal. Then type two statements using rand() to

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Answer:

View Image

Explanation:

No number is really ever random. It all has a seed, which is an initial value for the 'random' number to be generated. The rand() function uses an equation to generate its value, and all its 'random' value depend on the first number you plug in into your equation. The initial number you plug into your equation is what srand() do.

If you just call rand() alone without calling srand() then the generated numbers will automatically use srand(1) as a default seed. Using the same srand() value will always yield the same sequence of numbers.

To get a number between 0 and 9, take the modulus of it with 10 because modulus give you the remainder, so the number rand()%10 will never be equal to 10 or greater.

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3 years ago

Is air conditioner a refrigerator?

Sergeu [11.5K]

Answer: No, the air conditioner is not a refrigerator

Explanation:

First, We need to make a difference between refrigerant and refrigerator

Refrigerator is a compartment used to kept cool and store the food and drink.

Refrigerant: A substance used for the refrigeration

Refrigeration: It is the process to keep a material cold, generally food and drink

Then: The air conditioner is a refrigerant and the air conditioner unit is a refrigerator

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3 years ago

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Answer:

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Explanation:

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2 years ago

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Just trying to personally understand this is making me shed a few tears. Good luck with finding someone to answer your question!

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2 years ago