1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
shutvik [7]
3 years ago
7

A 2-pole, 50Hz, 20 kV turbo generator is rated 120 MVA and .95 power factor lagging. The machine rotor has a moment of inertia o

f 11000 kg*m^2. What is the kinetic energy of the machine
Engineering
1 answer:
notsponge [240]3 years ago
8 0

Answer:

782.290 MJ

Explanation:

Given Data:

number of poles ( p ) = 2-pole

Frequency ( f ) = 50 Hz

voltage ( v )  = 20 kV

power = 120  MVA

power factor (cos ∅ ) = 0.95

moment of inertia ( J ) = 11000 kg*m^2

First we calculate the value of

Ns = ( 120 * f ) / p

    = ( 120 * 50 ) / 2 = 3000 rpm

Ws = ( 2\piNs ) / f

      = (2\pi*3000 ) / 50 = 377.14 rad/sec

determine the kinetic energy of the machine

K.E = \frac{1}{2} * Jw^{2} _{s}

     = 1/2 * 11000 * ( 377.14 ) ^2

     = 5500 * 142234.58 = 782.290 MJ

You might be interested in
Compute the fundamental natural frequency of the transverse vibration of a uniform beam of rectanqular cross section, with one e
marshall27 [118]

Answer:

The natural angular frequency of the rod is 53.56 rad/sec

Explanation:

Since the beam is free at one end and fixed at the other hence the beam is a cantilevered beam as shown in the attached figure

We know that when a unit force is placed at the end of a cantilever the displacement of the free end is given by

\Delta x=\frac{PL^3}{3EI}

Hence we can write

P=\frac{3EI\cdot \Delta x}{L^3}

Comparing with the standard spring equation F=kx we find the cantilever analogous to spring with k=\frac{3EI}{L^3}

Now the angular frequency of a spring is given by

\omega =\sqrt{\frac{k}{m}}

where

'm' is the mass of the load

Thus applying values we get

\omega _{beam}=\sqrt{\frac{\frac{3EI}{L^{3}}}{Area\times density}}

\omega _{beam}=\sqrt{\frac{\frac{3\times 20.5\times 10^{10}\times \frac{0.1\times 0.3^3}{12}}{5.9^{3}}}{0.3\times 0.1 \times 7830}}=53.56rad/sec

8 0
3 years ago
Read 2 more answers
According to the
zysi [14]

Answer:

The part of the system that is considered the resistance force is;

B

Explanation:

The simple machine is a system of pulley  that has two pulleys

The effort, which is the input force at A gives the value of the tension at C and  D which are used to lift the load B

Therefore, we have;

A = C = D

B = C + D = C + C = 2·C

∴ C = B/2

We have;

C = B/2 = A

Therefore, with the pulley only a force, A equivalent to half the weight, B, of the load is required to lift the load, B

The resistance force is the constant force in the system that that requires an input force to overcome in order for work to be done

It is the force acting to oppose the sum of the other forces system, such as a force acting in opposition to an input force

Therefore, the resistance force is the load force, B, for which the input force, A, is required in order for the load to be lifted.

3 0
3 years ago
The "Crawler" developed to transport the Saturn V launch vehicle from the assembly building to the launch pad is the largest lan
Illusion [34]

Answer:

a) 152000 slugs

b) 2220000 kg or 2220 metric tons

Explanation:

A body with a weight of 4.9*10^6 lbf has a mass of

4.9*10^6 lbm * 1 lbf/lbm = 4.9*10^6 lbm

This mass value can then be converted to other mass values.

1 slug is 32.17 lbm

Therefore:

4.9*10^6 lbm * 1 slug / (32.17 lbm) = 152000 slugs

1 lb is 0.453 kg

Therefore:

4.9*10^6 lbm / (1/0.453) * kg/lbm = 2220000 kg

5 0
3 years ago
These waveforms are applied to a gated D latch, which is initially RESET. Which of the areas identified on the Q waveform is inc
Andrej [43]

Question Completion with Options:

A) Area a B) Area b C) Area c D) Area d

Answer:

The incorrect waveform identified on the Q waveform is the:

C) Area c.

Explanation:

Area c is the incorrect waveform because its output is not correct.  The Q waveform indicates that the electrical forces project toward the negative pole of the lead axis.  A gated D latch is a flip flop latch with an additional control input, which determines when to change the state of the circuit. Most times, this control unit is a clock input or an enable input.

8 0
3 years ago
a television set having apower rating of 120w and electric lawnmower of power rating 1kw are both connected to a 250v supply if
Soloha48 [4]

Answer:

<u>Television </u>

Power = 120 w

p.d = 240 v

I = p / v

I = 120 / 240 = 0.5

Fuse can be used 3A

<u>lawnmower</u>

Power = 1000w

p.d = 240 v

I = 1000/ 240 = 4.16

Fuse can be used = 5A

8 0
3 years ago
Other questions:
  • To be able to write an ss-domain equation for a circuit, use partial fraction decomposition to separate the terms in this equati
    12·1 answer
  • As the junior engineer at the Mesabi Range Hydraulic Engineering Company located in Ely, Minnesota, you have been tasked with de
    6·1 answer
  • One who waits too long to complain has indicated satisfaction with the agreement despite the initial lack of true consent is the
    14·1 answer
  • Suppliers(sid: integer, sname: string, address: string)
    9·1 answer
  • Decreasing unnecessary and wasteful purchases, decreasing the volume of waste, and decreasing
    6·1 answer
  • There do u know it.............
    15·1 answer
  • I need help with the question
    12·1 answer
  • Using examples, describe the relationship between accuracy and precision in measurement and their importance in conducting scien
    10·1 answer
  • 2. The moist weight of 0.1 ft3 of soil is 12.2 lb. If the moisture content is 12% and the specific gravity of soil solids is 2.7
    6·1 answer
  • If a resistor only has three color bands, it has a tolerance of 20 percent. What would this mean for a resistor specified at 10,
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!