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where the synchronous condenser are generally installed ?

1 Answer

the synchronous condenser are generally installed at receiving end side of transmission line 

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Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

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The damping winding in synchronous motor is generally used to?

Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

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Description : Draw and explain V and inverted V curves for synchronous motor.

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Description : Damper winding in a synchronous motor

Answer : Damper winding in a synchronous motor Serves to start the motor.

Description : 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

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Answer : 1

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Answer : Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting

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Answer : 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 0.5 pu

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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

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Answer : The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

Description : A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. lf its shaft load is reduced by half and field current is held constant then its new power factor will be

Answer : Leading

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Answer : In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

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Answer : Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

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Answer : If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.

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Answer : Slip-rings in a synchronous motor carry direct current.

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Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

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

Answer : A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.

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Answer : A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.

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

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Answer : The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

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Answer : A synchronous motor can develop synchronous torque at synchronous speed.

Description :

Answer : In case one phase of a three-phase synchronous motor is short-circuited the motor will not start.

Description :

Answer : In a synchronous motor, the armature current has large values for high and low excitation.

Description :

Answer :  The size of a synchronous motor decreases with the increase in flux density.

Description :

Answer : The duration of sudden short-circuit test on a synchronous motor is usually about one second.

Description :

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

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

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