Electrical Machines Questions and Answers – Synchronous Machines
Power Factor Control of Synchronous Machines
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The magnetization current drawn from an AC supply a synchronous motor is used to _______
Correct!
Wrong!

(I) Speed of an isolated alternator can be altered.
(II) Speed of an alternator connected to IBB can be also altered.
(II) Speed of an alternator connected to IBB can be also altered.
Correct!
Wrong!

The inverted V plots is plotted between
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Wrong!

For a power system having induction motor loads, an overexcited synchronous motor is also attached. Then the over all power factor
Correct!
Wrong!

(I)For constant power of an isolated alternator, Vcurves can be obtained.
(II)For constant power of an alternator connected to IBB, Vcurves can be obtained
(II)For constant power of an alternator connected to IBB, Vcurves can be obtained
Correct!
Wrong!

For a power system having induction motor loads, an overexcited synchronous motor is also attached. The induction motor will now operate at
Correct!
Wrong!

Synchronous compensators are
Correct!
Wrong!

When a constant power output is desired to maintain
Correct!
Wrong!

The Vcurves of synchronous motor is plotted between ________
Correct!
Wrong!

The operating frequency and voltage of an isolated alternator ________, if the prime mover input to motor is increased.
Correct!
Wrong!

The excess flux in synchronous motor is neutralized by
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When the excitation voltage is increased from 1 to 1.3 pu of a 3phase synchronous motor. Then load angle for the constant power operation
Correct!
Wrong!

For a synchronous motor, mark the appropriate.
Correct!
Wrong!

A 3 phase synchronous motor is working at normal excitation, then the flux deficient in circuit is ________
Correct!
Wrong!

The active power delivered by an alternator will _______ when the prime mover input is increased for the alternator connected to infinite bus bar.
Correct!
Wrong!

The armature current is ________ at UPF when compared to leading power factor for a motor.
Correct!
Wrong!

The armature current is _______ at UPF than motor at lagging power factor.
Correct!
Wrong!
