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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What are the advantages and disadvantages of induction motors?
(Solved)
Advantages and disadvantages of induction motors.
Date posted:
April 30, 2018
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Answers (1)
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Explain the advantages of induction motors over synchronous motors
(Solved)
Explain the advantages of induction motors over synchronous motors
Date posted:
April 30, 2018
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Answers (1)
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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 following data pertain to streamflow in a river at a given gauge station. The rate of rise in water surface elevation = 10.0 cm/h....
(Solved)
The following data pertain to streamflow in a river at a given gauge station. The rate of rise in water surface elevation = 10.0 cm/h. the normal discharge for the river stage obtained from the steady flow rating curve = 150 m3/s. slope of the river bed = 3 x 10-4. Assume the velocity of the flood wave to be 2.5 cm/sec, compute the river discharge.
Date posted:
April 9, 2018
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Answers (1)
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A drainage basin has an area of 210 km2. The average depth of rainfall received by it during a monsoon period is computed as 65...
(Solved)
A drainage basin has an area of 210 km2. The average depth of rainfall received by it during a monsoon period is computed as 65 cm, while the runoff measured at its outlet during the same period is estimated to be 5.68 x 107 m3. Compute the depth of runoff. What percentage of rainfall has become runoff? If all this runoff volume is stored and used to irrigate a crop which requires 60 cm of water, how many hectares can be irrigated?
Date posted:
April 9, 2018
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Answers (1)
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What volume is represented by 57 mm of runoff depth from a basin of area 3300 km2? Give the answer in m3, cumec-days, ha-m and...
(Solved)
What volume is represented by 57 mm of runoff depth from a basin of area 3300 km2? Give the answer in m3, cumec-days, ha-m and million cubic metres.
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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Differentiate malleability from ductility as used in material processing
(Solved)
Differentiate malleability from ductility as used in material processing
Date posted:
April 2, 2018
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Answers (1)
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State the general workshop safety rules
(Solved)
State the general workshop safety rules.
Date posted:
April 2, 2018
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Answers (1)
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Define Current
(Solved)
Define current
Date posted:
April 2, 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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Define a coulomb
(Solved)
Define a Coulomb
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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Explain wiring system
(Solved)
Explain wiring system
Date posted:
March 31, 2018
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Answers (1)
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Define basic units by stating examples
(Solved)
State basic units by stating examples.
Date posted:
March 31, 2018
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Answers (1)
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State and explain the types of radioactivity
(Solved)
State and explain the types of radioactivity
Date posted:
March 31, 2018
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Answers (1)
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Define radioactive decay
(Solved)
Define radioactive decay
Date posted:
March 30, 2018
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Answers (1)