Electrical Machines Questions and Answers – Synchronous Machine Stability
Synchronizing Power and Synchronizing Torque
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Large stiffness coefficient represents
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Variation in the dc excitation of a synchronous motor causes variation in
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The coupling angle or load angle of a synchronous motor is defined as the space angle between
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Which of the following makes synchronizing power to come to play in the machine
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Synchronizing power is
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Which motor can conveniently operate at lagging as well as leading power factor?
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As load angle is increased, degree of stability _________
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Consider the below remarks for an alternator
(i) An over excited machine is more stiff
(ii) Machine with longer air-gap is less stable than one with smaller air-gap
(i) An over excited machine is more stiff
(ii) Machine with longer air-gap is less stable than one with smaller air-gap
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For a 4-pole 3 phase, 400V alternator has synchronizing power of 300 units. Then the synchronizing power per mechanical degree is
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In a synchronous motor the back emf peak set up in the stator depends on
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Electromagnetic torque is present in rotating machines when
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Synchronizing power is
(i) Stiffness coefficient of electromagnetic coupling between stator and rotor
(ii) Stability measure of synchronous machine
(iii) Power consumption factor
(i) Stiffness coefficient of electromagnetic coupling between stator and rotor
(ii) Stability measure of synchronous machine
(iii) Power consumption factor
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The operation of a synchronous motor operating on constant excitation across infinite bus will not be stable if power angle δ
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An over excited synchronous machine is more stable than under excited
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Which of the following is/are used in synchronous machines to maintain mechanical stability?
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Synchronizing Power and Synchronizing Torque
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