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3 years ago

9

A 60-Hz 3-phase induction motor is required to drive a load at approximately 850 rpm. How many poles should the motor have

1 answer:

Anastaziya [24]3 years ago

7 0

Answer:

8 poles

Explanation:

Given

$Frequency, f = 60Hz$

$Speed, n_s = 850rpm$

Required

Calculate the number of poles the motor should have?

To solve this question, we make use of synchronous angular velocity formula

$n_s = \frac{120f}{P}$

Where

$P = Number\ of\ Poles$

Substitute values for $n_s$ and f in $n_s = \frac{120f}{P}$

$850 = \frac{120 * 60}{P}$

$850 = \frac{7200}{P}$

Multiply both sides by P

$P * 850 = \frac{7200}{P} * P$

$P * 850 = 7200$

Divide both sides by 850

$\frac{P * 850}{850} = \frac{7200}{850}$

$P = \frac{7200}{850}$

$P = 8.47058823529$

However, the number of poles must be an integer.

So:

$P = 8$

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Zanzabum

The example of a subsystem and system relationship is option

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3 years ago

The volume fraction of particles in a WC-particle Cu-matrix CERMET is 0.84 Calculate the minimum expected elastic modulus, in GP

Lynna [10]

Answer:

the minimum expected elastic modulus is 372.27 Gpa

Explanation:

First we put down the data in the given question;

Volume fraction $V_f$ = 0.84

Volume fraction of matrix material $V_m$ = 1 - 0.84 = 0.16

Elastic module of particle $E_f$ = 682 GPa

Elastic module of matrix material $E_m$ = 110 GPa

Now, the minimum expected elastic modulus will be;

$E_{CT$ = ( $E_f$ × $E_m$ ) / ( $E_f$ $V_m$ + $E_m$ $V_f$ )

so we substitute in our values

$E_{CT$ = (682 × 110 ) / ( [ 682 × 0.16 ] + [ 110 × 0.84] )

$E_{CT$ = ( 75,020 ) / ( 109.12 + 92.4 )

$E_{CT$ = 75,020 / 201.52

$E_{CT$ = 372.27 Gpa

Therefore, the minimum expected elastic modulus is 372.27 Gpa

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3 years ago

If the stopping sight distance required to avoid colliding with a fallen boulder on a mountain pass is 800 feet, what is the lik

Anettt [7]

Answer:

Grade is 10.32%

Explanation:

Given data:

stopping side distance is 800ft

t = 2.5 sec

design speed v = 65 miles/hr

a/g value is 0.35

stopping side distance is SSD

$SSD = 1.47 vt + \frac{v^2}{30(a/g - G}$

plugging all value for G

$800 = 1.47 \times 65\times 2.4 + \frac{65^2}{30(0.35 -G)}$

$800 - 229.32 = \frac{65^2}{30(0.35 -G)}$

$570.68 = \frac{65^2}{30(0.35 -G)}$

G = 0.1032

Grade is 10.32%

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4 years ago

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That the world is flat. Brainliest?

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2 years ago

A mechanism is a device that transmits movement so the output movement is different from the input movement. identify three ways

igomit [66]

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3 years ago