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
insens350 [35]
3 years ago
5

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.

The counter-emf [V]. b. The power supplied to the armature [W]. c. The mechanical power developed by the motor, [kW] and [hp]. d. The initial starting current if the motor is directly connected across the 230 V line, and the value of the starting resistor needed to limit the initial current to 115 A.
Engineering
1 answer:
hjlf3 years ago
5 0

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

You might be interested in
Major processing methods for fiberglass composited include which of the following? Mark all that apply) a)- Open Mold b)- Closed
Novay_Z [31]

Answer:

it is f all of the above

Explanation:

let me know if im right

im not positive if im right but i should be right

4 0
3 years ago
Which of the following sensors is used to provide suspension control module with feedback regarding vehicle cornering​ forces?
Readme [11.4K]

Answer:

A

Explanation:

4 0
2 years ago
What type of companies would employ in mechanics engineering​
Alex73 [517]
What do y’all do when ya girl go eat lunch and eat it and eat
3 0
3 years ago
What is the fastest motorcycle in the world ?
givi [52]

Answer:

Kawasaki Ninja H2R – top speed: 222 mph. This one is another beast in the form of a bike. ...

MTT Turbine Superbike Y2K – top speed: 227 mph. This bike is one of the most powerful production motorcycles. ...

Suzuki Hayabusa – top speed: 248 mph. 1340cc

8 0
3 years ago
Read 2 more answers
Martha has been running a small business for two years. She now seeks additional investment to finance her business. She has fou
Dafna11 [192]

Answer:

The correct option is B) Balance Sheet

Explanation:

A Balance Sheet offers a description of a company's obligations, assets, and investments as well as net income over a given span of time such as a period of 6 months or 12 months, for instance.

Also known as the Statement of Financial Position, it contains sufficient information for investors and business owners to determine the company's financial performance in that period as well as to compare the performance of that company with industry norms or competition.

Cheers

8 0
3 years ago
Other questions:
  • 3. When starting an automatic transmission
    6·1 answer
  • Which process is a from of mechanical weathering
    8·1 answer
  • What is the linear distance traveled in one revolution of a 36-inch wheel
    6·1 answer
  • Buying shop supplies from the shop owner to work on your own car at home is an ethical practice.
    14·1 answer
  • Using a conditional expression, write a statement that increments num_users if update_direction is 3, otherwise decrements num_u
    9·1 answer
  • Water flowing through both a small pipe and a large pipe can fill a water tank in 4 hours. Water flowing through the small pipe
    5·1 answer
  • Mnsdcbjksdhkjhvdskjbvfdfkjbcv hjb dfkjbkjfvvfebjkhbvefgjdf
    7·2 answers
  • How long will it take a Honda Civic to travel 118 miles if it is travelling at an average speed of 72 mph?
    6·1 answer
  • B) Calculate the FS against uplift and calculate effoctive stress at the base level for water
    11·1 answer
  • The loneliest people are to kindest
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!