The starter of a synchronous motor is fed my three phase AC current while the rotor is fed by DC current. At some instance the north pole of starter magnetic field will coincide with the north of rotor magnetic field and the very next second the poles will be opposite, that is N S, so this will make the rotor to stand still until an external force is applied to start the rotation.
Sirnels answered the question on April 30, 2018 at 22:03
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Into a stream, with no trace of salt initially, a salt with a concentration of 20 mg/cc is introduced at a constant rate of 2...
(Solved)
Into a stream, with no trace of salt initially, a salt with a concentration of 20 mg/cc is introduced at a constant rate of 2 litres per minute. The samples collected at a downstream section sufficiently far away indicated an equilibrium salt concentration of 0.05 ppm. Determine the discharge in the stream from this data.
Date posted:
April 9, 2018
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Answers (1)
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The mean daily flows at a gauging station for a period of 7 days are 7, 27, 58, 41, 31, 20 and 13 m3/s respectively....
(Solved)
The mean daily flows at a gauging station for a period of 7 days are 7, 27, 58, 41, 31, 20 and 13 m3/s respectively. What is the total volume of streamflow at the site in cumec-days(metres cubed per second.)? and in hectare-metres? What is the mean flow rate for the week? If the drainage area at the site is 100 km2, what is the runoff volume in cm?
Date posted:
April 9, 2018
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Answers (1)
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What are the contributions that engineers could make to conserve energy
(Solved)
What are the contributions that engineers could make to conserve energy
Date posted:
April 5, 2018
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Answers (1)
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State seven causes of accidents in the workshop
(Solved)
State seven causes of accidents in the workshop
Date posted:
April 1, 2018
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Answers (1)
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State the IEE regulations regarding cables
(Solved)
State the IEE regulations regarding cables
Date posted:
April 1, 2018
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Answers (1)
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State the properties of copper that makes it a good choice for electrical conductors
(Solved)
State the properties of copper that makes it a good choice for electrical conductors.
Date posted:
April 1, 2018
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Answers (1)
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State the factors considered when selecting a particular witing system
(Solved)
State the factors considered when selecting a particular wiring system.
Date posted:
March 31, 2018
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Answers (1)
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State two indications of a fully charged lead-acid cell
(Solved)
State two indications of a fully charged lead-acid cell.
Date posted:
March 5, 2018
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Answers (1)
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Explain the term “cogeneration” and give two possible ways of cogeneration
(Solved)
Explain the term “cogeneration” and give two possible ways of cogeneration
Date posted:
February 22, 2018
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Answers (1)
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What is meant by grading of cables? Explain the two methods of grading
(Solved)
What is meant by grading of cables? Explain the two methods of grading
Date posted:
February 22, 2018
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Answers (1)
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Explain the different methods of starting an induction motor.
(Solved)
Explain the different methods of starting an induction motor.
Date posted:
February 22, 2018
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Answers (1)
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Identify the motor being used in the ceiling fan and explain the method of its control
(Solved)
Identify the motor being used in the ceiling fan and explain the method of its control
Date posted:
February 22, 2018
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Answers (1)
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Why are different levels of voltages used for generation, transmission and
distribution of electric power?
(Solved)
Why are different levels of voltages used for generation, transmission and
distribution of electric power?
Date posted:
February 20, 2018
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Answers (1)
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With the aid of sketches explain the operation of a four stroke engine
(Solved)
With the aid of sketches explain the operation of a four stroke engine.
Date posted:
February 16, 2018
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Answers (1)
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Give five functional requirements of foundations
(Solved)
Give five functional requirements of foundations.
Date posted:
January 1, 2018
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Answers (1)
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Explain how to test for silt content in sand.
(Solved)
Explain how to test for silt content in sand.
Date posted:
January 1, 2018
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Answers (1)
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List five causes of unsealing of traps
(Solved)
List five causes of unsealing of traps.
Date posted:
January 1, 2018
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Answers (1)
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State 5 principles of a good drainage system.
(Solved)
State 5 principles of a good drainage system.
Date posted:
January 1, 2018
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Answers (1)
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Give two reasons for providing hoarding on a construction site.
(Solved)
Give two reasons for providing hoarding on a construction site.
Date posted:
October 11, 2017
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Answers (1)
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State three possible causes of ground movement under foundation.
(Solved)
State three possible causes of ground movement under foundation.
Date posted:
October 11, 2017
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Answers (1)