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What series is used to analyze the field form?
Answer: b Explanation: The field form of a salient pole is rectangular is the air gap under pole arc is uniform and if fringing effects are neglected. The field form can be analyzed for its harmonic contents with the help of Fourier series.
Answer: b
Explanation: The field form of a salient pole is rectangular is the air gap under pole arc is
uniform and if fringing effects are neglected. The field form can be analyzed for its
harmonic contents with the help of Fourier series.
See lessWhat happens if the field form is symmetrical about the pole axis?
Answer: d Explanation: If the field form is symmetrical about the pole axis the north and south pole of a machine are similar. As the poles are similar, no harmonics and no cosine terms and the constant term is zero.
Answer: d
Explanation: If the field form is symmetrical about the pole axis the north and south pole
of a machine are similar. As the poles are similar, no harmonics and no cosine terms
and the constant term is zero.
See lessWhat Is the formula for the amplitude of the fundamental curve?
Answer: a Explanation: The flux density in the air gap is calculated along with the cosine of the phase angle divided by 2. On substitution, the amplitude of the fundamental curve is calculated.
Answer: a
Explanation: The flux density in the air gap is calculated along with the cosine of the
phase angle divided by 2. On substitution, the amplitude of the fundamental curve is
calculated.
See lessHow many factors does the value of the magnetizing current depends upon?
Answer: b Explanation: There are 3 factors upon which the magnetizing current depends upon. They are total mmf required, number of turns in the exciting winding and upon the way in which the winding is distributed.
Answer: b
Explanation: There are 3 factors upon which the magnetizing current depends upon.
They are total mmf required, number of turns in the exciting winding and upon the way in
which the winding is distributed.
See lessWhat is the formula for the magnetizing current?
Answer: b Explanation: First the total mmf is calculated along with the number of turns of the magnetizing winding. Then on substitution the magnetizing current is obtained.
Answer: b
Explanation: First the total mmf is calculated along with the number of turns of the
magnetizing winding. Then on substitution the magnetizing current is obtained.
See lessWhat is the formula for the rms value of the magnetizing current?
Answer: a Explanation: The maximum value of the magnetizing current and the peak factor are calculated first. On substitution, the rms value of the magnetizing current is obtained.
Answer: a
Explanation: The maximum value of the magnetizing current and the peak factor are
calculated first. On substitution, the rms value of the magnetizing current is obtained.
See lessWhat is the relation of the type of winding with the flux linkage?
Answer: a Explanation: The magnetizing current is actually calculated for the concentrated windings and the distributed windings. In the distributed windings, the flux does not link with all the turns.
Answer: a
Explanation: The magnetizing current is actually calculated for the concentrated
windings and the distributed windings. In the distributed windings, the flux does not link
with all the turns.
See lessWhat is the relation of the magnetizing current with the turns per phase?
Answer: c Explanation: The magnetizing current is actually calculated for the concentrated windings and the distributed windings. In the distributed windings, magnetizing current is indirectly proportional to the turns per phase
Answer: c
Explanation: The magnetizing current is actually calculated for the concentrated
windings and the distributed windings. In the distributed windings, magnetizing current is
indirectly proportional to the turns per phase
See lessThe plot of the flux density distribution curve is between the interpolar axis consisting of the flux density and the angle difference between phases.
Answer: a Explanation: The flux density distribution curve is used to calculate the magnetizing current in the non sinusoidal flux distribution of the distributed windings. The curve is between the flux density and the phase angle.
Answer: a
Explanation: The flux density distribution curve is used to calculate the magnetizing
current in the non sinusoidal flux distribution of the distributed windings. The curve is
between the flux density and the phase angle.
See lessHow is the flux distributed in the field form?
Answer: d Explanation: The flux in passing from poles into the armature, does not confine itself over the pole arc but spreads out over the entire pole pitch. The flux will distribute itself in the air gap in such a way that the total reluctance is minimum.
Answer: d
Explanation: The flux in passing from poles into the armature, does not confine itself
over the pole arc but spreads out over the entire pole pitch. The flux will distribute itself
in the air gap in such a way that the total reluctance is minimum.
See less