What is Synchronous condenser?

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What is Synchronous condenser?

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asked Aug 9, 2017 by anonymous

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Can a synchronous condenser improve power factor?

Can a synchronous condenser improve power factor?
Last Answer : Yes, synchronous condenser can improve power factor.

90 views 1 answer

asked Mar 19, 2018 by anonymous

where the synchronous condenser are generally installed ?

where the synchronous condenser are generally installed ?
Last Answer : the synchronous condenser are generally installed at receiving end side of transmission line

119 views 1 answer

asked Aug 18, 2017 by anonymous

operating principle of condenser type microphone with neat diagram.

operating principle of condenser type microphone with neat diagram.
Last Answer : Principle: When sound pressure moves the diapharam in, the capacitance increases, and when it moves out, the capacitance decreases. The change in capacitance results in change in out put voltage of microphone. ... in volts. Q= charge in coulombs C= capacitance in farad Diagram:

99 views 1 answer

asked Sep 2, 2019 by anonymous

Explain working of superheater and condenser.

Explain working of superheater and condenser.
Last Answer : Working of Super heater: Super heater consist of group of tubes. Tubes are heated by absorbing temperature of flue gases passed over it . Superheated steam' is meant that steam which ... condensate is reused in boiler. This type of condenser is used for high capacity thermal power plant.

94 views 1 answer

asked Sep 8, 2018 by anonymous

State the function of cooling tower and condenser in thermal power station.

State the function of cooling tower and condenser in thermal power station.
Last Answer : 1. Condenser: Function of condenser is to convert exhaust steam again into water by reducing its temperature with the help of cold water. Also it reduces back pressure of steam turbine 2 ... tower : The function of cooling tower is to reduce the temperature of water coming from condenser.

319 views 1 answer

asked Sep 8, 2018 by anonymous

Static Synchronous Compensator (STATCOM)

Static Synchronous Compensator (STATCOM)
Last Answer : Static Synchronous Compensator (STATCOM) STATCOM stands for Static Synchronous Compensator or Condenser. It may be a source of reactive power or sink of reactive AC power. It can ... and Controllers etc. STATCOM have symmetric lead-lag capability. STATCOM have no moving part.

189 views 1 answer

asked Aug 9, 2017 by anonymous

SYNCHRONOUS MOTORS MCQ

SYNCHRONOUS MOTORS MCQ
Last Answer : 101. In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then (a) the motor is said to be fully loaded (b) the torque ... square of the applied voltage (c) inversely proportional to applied voltage (d) none of the above Ans: a

21 views 3 answers

asked Jun 22, 2021 by itszee

List different starting methods of three phase synchronous motor. Explain any one of them.

List different starting methods of three phase synchronous motor. Explain any one of them.
Last Answer : Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.

165 views 1 answer

asked May 7, 2020 by anonymous

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

Draw and explain V and inverted V curves for synchronous motor.
Last Answer : V curves' and inverted V curves' for Synchronous Motor: V curve: V curve is a plot of the stator current versus field current for different constant loads. The graph is plotted ... Vcurves of synchronous motor. The highest point on each of these curves indicates unity power factor.

509 views 1 answer

asked May 7, 2020 by anonymous

List different torques in synchronous motor.

List different torques in synchronous motor.
Last Answer : Different Torques in Synchronous Motor: 1) Starting torque 2) Running torque 3) Pull-in torque 4) Pull-out torque

121 views 1 answer

asked May 7, 2020 by anonymous

Compare characteristics of asynchronous and synchronous transmission mode.

Compare characteristics of asynchronous and synchronous transmission mode (four points).
Last Answer : Synchronous transmission Asynchronous transmission 1. Synchronous transmission are synchronized by an external clock. 1. Asynchronous transmission are synchronized by special signals along the transmission ... for transferring a small amount of data as it is simple and economical.

82 views 1 answer

asked Aug 4, 2019 by anonymous

Compare synchronous and asynchronous counter.

Compare synchronous and asynchronous counter.
Last Answer : Asynchronous Counter Synchronous Counter In an Asynchronous Counter the output of one Flip Flop acts as the clock Input of the next Flip Flop. In a Synchronous Counter all the Flip Flop's are ... Also called as serial counter Also called as Parallel Counter

82 views 1 answer

asked Jul 31, 2019 by anonymous

Compare Asynchronous sequential and synchronous sequential circuits.

Compare Asynchronous sequential and synchronous sequential circuits.
Last Answer : SR. NO. ASYNCHRONOUS SEQUENTIAL CIRCUIT SYNCHRONOUS SEQUENTIAL CIRCUITS. 1 Output can be changed at any instant of time by changing the input Output changes at discrete ... the counter change state simultaneously. This is because all the flip-flops are clocked simultaneously.

84 views 1 answer

asked Jul 21, 2019 by anonymous

Synchronous vs asynchronous logic

Synchronous vs asynchronous logic
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

2.6k views 1 answer

asked Jul 6, 2019 by anonymous

Damper winding in a synchronous motor

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

88 views 1 answer

asked May 8, 2018 by anonymous

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done
Last Answer : Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done Raise If1 and lower If2

424 views 1 answer

asked May 3, 2018 by anonymous

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation,

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
Last Answer : 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 synchronous generator

605 views 1 answer

asked May 1, 2018 by anonymous

The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to

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 ... consideration the possibility of machine losing synchronism after it has survived during the first swing.
Last Answer : 1

697 views 2 answers

asked Apr 30, 2018 by anonymous

Damper winding is provided in 3 phase synchronous motors to :

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

95 views 1 answer

asked Apr 29, 2018 by anonymous

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load (A) The armature current increases and the power factor decreases (B) The armature ... but is lagging (D) The armature current decreases and the power factor increases and is leading
Last Answer : In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load The armature current decreases and the power factor increases and is leading

130 views 1 answer

asked Apr 29, 2018 by anonymous

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)

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
Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

197 views 1 answer

asked Apr 29, 2018 by anonymous

In a synchronous generator delivering lagging power factor load

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) ... by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle
Last Answer : In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle

344 views 1 answer

asked Apr 29, 2018 by anonymous

In a self-controlled synchronous motor fed from a variable frequency inverter

In a self-controlled synchronous motor fed from a variable frequency inverter (1) the rotor poles invariably have damper windings (2) there are stability problems (3) the speed of the rotor decides stator frequency (4) the frequency of the stator decides the rotor speed
Last Answer : 2

644 views 2 answers

asked Apr 29, 2018 by anonymous

During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to

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)
Last Answer : 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) only at C

254 views 1 answer

asked Apr 29, 2018 by anonymous

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, ... system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz
Last Answer : Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is 50 Hz

114 views 1 answer

asked Apr 28, 2018 by anonymous

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and

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
Last 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

100 views 1 answer

asked Apr 28, 2018 by anonymous

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu

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 ... pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu
Last Answer : 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 0.866 pu, 0.5 pu

100 views 1 answer

asked Apr 28, 2018 by anonymous

Torque angle for the synchronous machine is the angle between

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
Last Answer : Torque angle for the synchronous machine is the angle between rotor magnetic field and net magnetic field in the air gap

130 views 1 answer

asked Apr 28, 2018 by anonymous

The armature reaction in a synchronous generator supplying leading power factor load is

The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing
Last Answer : The armature reaction in a synchronous generator supplying leading power factor load is magnetizing and cross-magnetizing

99 views 1 answer

asked Apr 28, 2018 by anonymous

The effect of increasing load on a synchronous motor running with normal excitation is

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.
Last Answer : The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

575 views 1 answer

asked Apr 28, 2018 by anonymous

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor.

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
Last Answer : Leading

568 views 2 answers

asked Apr 28, 2018 by anonymous

Asynchronous circuits are usually faster than synchronous circuits because

Asynchronous circuits are usually faster than synchronous circuits because
Last Answer : Asynchronous circuits are usually faster than synchronous circuits because they are free running and do not depend on the frequency of the clock

90 views 1 answer

asked Apr 26, 2018 by anonymous

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will?

Last 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.

112 views 1 answer