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hammer [34]
2 years ago
9

Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the earth. Whic

h statment best explains why different areas of the earth have different amounts of heat energy
Engineering
1 answer:
Verizon [17]2 years ago
8 0
The Earth receives different amounts of solar energy in different regions.
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A 3-phase induction motor with 4 poles is being driven at 45 Hz and is running in its normal operating range. When connected to
Dennis_Churaev [7]

Answer:

a) The slip for the given conditions is 0.2074 or 20.74% and the developed torque is 7.14 Nm.

b) The new slip after reducing the torque to 4 Nm is 0.1162 or 11.62% and the new motor speed is 1193.13 rpm.

Explanation:

In order to find the slip we can use the definition as the relative difference between Synchronous speed and the rotor speed and that the developed torque is the ratio between output power and rotor angular velocity.

Slip.

We can find the synchronous speed u sing the following formula

N_s =\cfrac{120f}p

Where f stands for the frequency and p the number of poles, so we have

N_s = \cfrac{120(45)}{4}\\N_s =1350 \,rpm

Replacing on the slip formula

S = \cfrac{N_s-N_r}{N_s}

we get

S = \cfrac{1350-1070}{1350}\\ S = 0.2074

Thus the slip for the given conditions is 0.2074 or 20.74%.

Developed torque.

We can find the angular velocity in radians per second

\omega_r =1070  \cfrac{rev}{min} \times \cfrac{1 \, min}{60 \, s}\times \cfrac{2\pi rad}{1 \, rev}\\\omega_r =112.05 \, \cfrac{rad}{s}

Thus we can replace on the torque formula

\tau = \cfrac{P}{\omega_r}\\\tau=\cfrac{800 W}{112.05 \, \cfrac{rad}{s}}

We get

\tau = 7.14\,  N m

The developed torque is 7.14 Nm.

Slip for the reduced torque.

The torque is proportional to the slip, so we can write

\cfrac{\tau_1}{\tau_2}= \cfrac{S_1}{S_2}

Thus solving for the new slip S_2 we have:

S_2 = S_1 \cfrac{\tau_2}{\tau_1}

Replacing the values obtained on the previous part we have

S_2 = 0.2074 \cfrac{4 Nm}{7.14 Nm}\\ S_2=0.1162

So the new slip after reducing the torque to 4 Nm is 0.1162 or 11.62%

Motor speed.

We can use the slip definition

S_2 =\cfrac{N_s-N_{r_2}}{N_s}

Solving for the motor speed we have

S_2N_s =N_s-N_{r_2}

N_{r_2}=N_s-S_2N_s \\N_{r_2}=N_s(1-S_2)

Replacing values we have

N_{r_2}=1350 \, rpm(1-0.1162)\\N_{r_2}=1193.13 rpm

The new motor speed is 1193.13 rpm.

5 0
3 years ago
What is the process pf distributing and selling clean fuel?​
kipiarov [429]

Answer:

I got hygition production and decomposing

Explanation:

6 0
2 years ago
Which one is dependent variable?
GREYUIT [131]

Answer:

The dependent variable is MEDV - Median value of owner-occupied homes in $1000's

Explanation:

The median value of the house has to be predicted, based on its properties and neighborhood properties, this can be done by using a linear regression model.

The dependent variable in Machine Learning is the output variable that we want to predict.

Therefore, according to the question given "MEDV" is the dependent variable.

8 0
3 years ago
Generally the primary source of all water supply is to be said as
geniusboy [140]

Answer:

b) River

the primary source of all water supply is to be said as River

Explanation:

3 0
3 years ago
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A friend would like you to build an "electronic eye" for use as a fake security device. The device consists of three lights line
mars1129 [50]

Answer and explanation:

The graphical representation of the electronic eye

The state table showing

the present state

input

Next state and

the output

are shown in the attached file

8 0
3 years ago
Read 2 more answers
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