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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is
1 and 2
2 and 3
1 alone
1 and 3
1 and 2
2 and 3
1 alone
1 and 3
Answer
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Related Question
Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will
reduce by 5 %.
increase by 5 %.
remain unchanged.
depend on other factors.
reduce by 5 %.
increase by 5 %.
remain unchanged.
depend on other factors.
Answer
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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to
190 A.
127 A.
240 A.
173 A.
190 A.
127 A.
240 A.
173 A.
Answer
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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are
armature resistance, effect of armature reaction.
armature resistance, effect of armature reaction.
reduction in field current, effect of armature reaction, armature.
armature resistance, inter poles, armature.
armature resistance, effect of armature reaction.
armature resistance, effect of armature reaction.
reduction in field current, effect of armature reaction, armature.
armature resistance, inter poles, armature.
Answer
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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as
they have maximum efficiency and maximum starting torque.
these are cheaper in cost, simple and rugged in construction.
they are capable of operation under range of leading and lagging pf.
they have very good speed regulation.
they have maximum efficiency and maximum starting torque.
these are cheaper in cost, simple and rugged in construction.
they are capable of operation under range of leading and lagging pf.
they have very good speed regulation.
Answer
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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?
30°.
90°.
60°.
120°.
30°.
90°.
60°.
120°.
Answer
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