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Advocard [28]
3 years ago
12

Example – a 100 kW, 60 Hz, 1175 rpm motor is coupled to a flywheel through a gearbox • the kinetic energy of the revolving compo

nents is 300 kJ at rated speed – the motor is plugged to a stop and allowed to run up to 1175 rpm in the reverse direction • calculate the energy dissipated in the rotor
Engineering
1 answer:
rjkz [21]3 years ago
7 0

Answer:

1200KJ

Explanation:

The heat dissipated in the rotor while coming down from its running speed to zero, is equal to three times its running kinetic energy.

P (rotor-loss) = 3 x K.E

P = 3 x 300 = 900 KJ

After coming to zero, the motor again goes back to running speed of 1175 rpm but in opposite direction. The KE in this case would be;

KE = 300 KJ

Since it is in opposite direction, it will also add up to rotor loss

P ( rotor loss ) = 900 + 300 = 1200 KJ

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A system that is not influence anyway by the surroundings is called a)- control mass system b)- Isothermal system c)-- isolated
NARA [144]

Answer:

Isolated system

Explanation:

By definition of a closed system it means that a system that does not interact with it's surroundings in any manner

The other options are explained as under:

Isothermal system : It is a system that does not allow it's temperature to change

Control Mass system : It is a system whose mass remains conserved which means the mass entering the system equals the mass leaving the system

Open system: It is a system that allows transfer of mass and energy across it's boundary without any opposition i.e freely.

5 0
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%

5 0
3 years ago
A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. When it is run in reverse, with
Alexxandr [17]

To solve this problem, we must simply use the concept of Total Energy transferred both in terms of work and heat. This is basically conjugated in the first law of thermodynamics.

If we take the heat absorbed as positive and the expelled as negative we have that the total work done in the heat engine is

W_1 = 2500-1000

W_1 = 1500J

For the case of the engine pumps the Energy absorbed is

W_2 = 1500J

In this way the ratio between the two would be

Ratio = \frac{W_1}{W_2} = \frac{1500}{1500} = 1

So it is reversible, because the state of efficiency of the body is totally efficient.

3 0
3 years ago
Which of the following is an interdisciplinary approach to architectural or interior design most like?
Stells [14]

Answer:

An arrow

Explanation:

An interdisciplinary approach to architectural designs is more concerned with

ideas combined towards the outcome of the project without dividing a design based on different artistic approaches. The goal here is to have an open mind aware of the transdisciplinary in the area of architectural design. The belief is to attain a design which as a real social value with respect to the fact that architectural designs are increasingly influenced by urban factors. An arrow in the quiver is an idiom which means different strategies that could be used to achieve your objectives. This can be compared to the different artistic approaches that could combine to produce the desired architectural design.

6 0
2 years ago
Read 2 more answers
What's the maximum shear on a 3.0 m beam carrying 10 kN/m?
Dima020 [189]

Answer:

max shear = R = V = 15 kN

Explanation:

given:

load = 10 kn/m

span = 3m

max shear = R = V = wL / 2

max shear = R = V = (10 * 3) / 2

max shear = R = V = 15 kN

5 0
3 years ago
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