Electrical Machines Questions and Answers – Synchronous Machines
Power Factor Control of Synchronous Machines
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For a synchronous motor, mark the appropriate.
Correct!
Wrong!

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!

(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 armature current is _______ at UPF than motor at lagging power factor.
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 excess flux in synchronous motor is neutralized by
Correct!
Wrong!

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

The inverted V plots is plotted between
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!

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

The magnetization current drawn from an AC supply a synchronous motor is used to _______
Correct!
Wrong!

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

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

A 3 phase synchronous motor is working at normal excitation, then the flux deficient in circuit is ________
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. Then the over all power factor
Correct!
Wrong!

Synchronous compensators are
Correct!
Wrong!
