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What is the direction of flow when charging a capacitor?

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Synchronsizing power of a synchronous machine is inversely proportional to the synchronous reactance.

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1 answer 24 views

If we change the excitation of synchronous machine will it affect on power factor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 17 views

Which machine is the exciter of synchronous machine?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 18 views

If we change the excitation of synchronous machine will it affect on motor speed?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 15 views

V - curve of synchronous machine shows the relation between?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 93 views

Why synchronous machine is called doubly excited machine?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 27 views

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to an infinite bus  (1) ignores line as well as synchronous machine resistance and shunt capacitances.  (2) assumes accelerating power acting on the rotor as constant.  (3) ignores the effect of voltage ... inherent damping present in the machine.  (4) takes into consideration the possibility of machine losing synchronism after it has survived during the first swing.

asked Apr 30, 2018 in Power system by Shimroz123
1 answer 28 views

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 34 views

During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to steady state at point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s)

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 30 views

Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 27 views

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 28 views

If the load of the normally excited synchronous motor is increased the power factor will?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 22 views

If the field of synchronous motor is under excited, power factor will be?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 29 views

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 19 views

The synchronous motor will develop maximum power when the load angle is?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 18 views

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 16 views

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu, 0.866 pu (B) 0.866 pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 24 views

In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) excitation emf leads the terminal voltage by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

Can a synchronous condenser improve power factor?

asked Mar 19, 2018 in Electric Power Generation by Shimroz123
0 answers 22 views

How can we improve power factor using synchronous motor?

asked Mar 15, 2018 in Electrical Machine by Quiz
0 answers 30 views

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 38 views

What is the maximum value of torque angle in synchronous motor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 28 views

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 17 views

A synchronous motor can be made self starting by providing?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 20 views

In a synchronous motor which losses varies with load?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 35 views

How can we reverse the direction of rotation of synchronous motor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 19 views

The back emf of synchronous motor depends on?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 145 views

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
0 answers 29 views

The power factor of a synchronous machine is controlled by (A) connected load (B) generated voltage (C) field current (D) load angle 

asked Jun 4, 2018 in Synchronous machine by Shimroz123

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