How should be the value of field mmf to prevent excessive distortion of field form by armature reaction in an electric machine? a) large compared to armature mmf b) small compared to armature mmf c) zero d) large or small compared to armature mmf
How should be the value of field mmf to prevent excessive distortion of field form by armature reaction in an electric machine? a) large compared to armature mmf b) small compared to armature mmf c) zero d) large or small compared to armature mmf
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a) large compared to armature mmf
a) large compared to armature mmf
a) large compared to armature mmf
A. Large compared to armature mmf
A. Large compared to armature mmf
a) 3
b) 4
c) 5
d) 6
a) flux tube
b) output power
c) mean mmf
d) mean mmf and flux tube
a) flux is directly proportional to the magnetizing current
b) flux is indirectly proportional to the magnetizing current
c) flux is directly proportional to square of the magnetizing current
d) flux is indirectly proportional to square of the magnetizing current
a) 30°
b) 45°
c) 60°
d) 90°
a) Conductance of winding
b) Insulation of machine
c) Speed of machine
d) Torque of machine
a) By maximum voltage stress and maximum saturation
b) By mechanical stress
c) By maximum saturation and mechanical stress
d) By maximum voltage stress and mechanical stress
a) 3
b) 2
c) 1
d) 4
a) the magnetizing component is in phase with the voltage
b) the magnetizing component is 90° leading the voltage
c) the magnetizing component is 90° lagging the voltage
d) the magnetizing component is 90° out of phase with the voltage
a) Pulsational loss increases with an increase in air gap length
b) Pulsational loss decreases with an increase in air gap length
c) Pulsational loss does not change with an increase in air gap length
d) Pulsational loss may increase or decrease with an increase in air gap length
a) More pulsational loss in pole face
b) Quieter operation of the machine
c) Distorting effect of armature reaction more
d) No proper ventilation
a) Electric circuit
b) Magnetic circuit
c) Dielectric circuit
d) Thermal circuit
machines?
a) Using maximum allowable flux density
b) Using specific permeance
c) Using the linear velocity of material
d) Using maximum allowable loss
a) large compared to armature mmf
A. Large compared to armature mmf
Answer: a
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf
a
Explanation: The field mmf must be large compared to armature mmf to prevent excessive distortion of field form by armature reaction. The air gap length can be made large to reduce the distortion effect of armature reaction as a long air gap needs a large field mmf.
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made large to reduce the distortion effect of armature reaction as a long air gap needs a large field mmf.
(a) large compared to armature mmf
a) large compared to armature mmf
a) large compared to armature mmf
a) large compared to armature mmf
Explanation: The field mmf must be large compared to armature mmf to prevent excessive distortion of field form by armature reaction. The air gap length can be made large to reduce the distortion effect of armature reaction as a long air gap needs a large field mmf.
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent excessive distortion of field form by armature reaction. The air gap length can be made large to reduce the distortion effect of armature reaction as a long air gap needs a large field mmf.
answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf.
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf.
a) large compared to armature mmf
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made large to reduce the distortion effect of armature reaction as a long air gap needs a large field mmf.
Answer: a Explanation: The field mmf must be large compared to armature mmf to prevent excessive distortion of field form by armature reaction. The air gap length can be made large to reduce the distortion effect of armature reaction as a long air gap needs a large field mmf.
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf.
a) large compared to armature mmf
a) large compared to armature mmf
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf.
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf.
a) large compared to armature mmf
Answer: a
Explanation: The field mmf must be large compared to armature mmf to prevent
excessive distortion of field form by armature reaction. The air gap length can be made
large to reduce the distortion effect of armature reaction as a long air gap needs a large
field mmf.