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

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Description :

Why capacitors are used to improve power factor?

Answer :

 Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

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Description :

Can a synchronous condenser improve power factor?

Answer :

Yes, synchronous condenser can improve power factor.

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Description :

How can we improve power factor using synchronous motor?

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Description :

Answer :

For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

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Description :

Answer :

Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.

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81 views 1 answer
Description :

Capacitors for power factor correction are rated in?

Answer :

Capacitors for power factor correction are rated in kVAR.

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Description :

How does a capacitor improve power factor?

Answer :

Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.

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Answer :

The primary reason for low power factor is supply system is due to installation of induction motors.

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Answer :

The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

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Description :

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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Description :

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

Answer :

In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle

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Description :

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

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

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Description :

Answer :

For power factor correction, synchronous motors operate at no-load and greatly over-excited fields.

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Description :

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

Answer :

Yes, If we change the excitation of synchronous machine it will affect on power factor. If the synchronous motor is overexcited then it will have leading power factor and if the motor is underexcited then it will have lagging power factor.

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Description :

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

Answer :

If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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115 views 1 answer
Description :

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

Answer :

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

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Description :

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

Answer :

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

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Description :

Answer :

Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.

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Description :

The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile

Answer :

The benefit of power factor correction in a power system is lower power consumption

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Description :

Power factor of the system is kept high?

Answer :

Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.

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Description :

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer :

(i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

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Description :

Answer :

In an interconnected system, the diversity factor of the whole system increases.

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Description :

State the losses in secondary distribution system. 

Answer :

The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply

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69 views 1 answer
Description :

The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

Answer :

The permissible voltage variation in transmission and distribution system is: ±10%

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323 views 1 answer
Description :

requirements of a distribution system

Answer :

Following requirements of a distribution system.  1. Layout should be simple in design. 2. It should have less initial cost 3. The distribution system should have minimum distribution ... stability of existing distribution system. 15. Time required for completion of work should be less. 

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Description :

The main criterion for selection of the size of a radial distribution system is

Answer :

The main criterion for selection of the size of a radial distribution system is voltage drop

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275 views 1 answer
Description :

Grid distribution system

Answer :

Grid distribution system:-  In this system, when the feeder or loop or ring is charged (energized) by two or more than two substations from two or more than two different generating stations then it is known as “Grid distribution system. In this system only one feeder is utilized at a time. 

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37 views 1 answer
Description :

Define: primary and secondary distribution system 

Answer :

i) Primary Distribution:  It is a 3-phase, 3-wire transmission line connected in between receiving substation to Distribution substation. OR It is link between receiving substation & ... substation to consumer line. OR It is link between distribution transformer substation & consumer. 

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22 views 1 answer
Description :

Why radial distribution system used for short distance ? 

Answer :

Because of following disadvantages radial distribution system is not used for long distance:  Since there is only one feeder to DTC feed at one point so, 1) There is no reliability ... more time for fault finding & repairing Hence radial distribution system is used for short distance.

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76 views 1 answer
Description :

Answer :

In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.

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79 views 1 answer
Description :

What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz   #powerfactor

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Description :

Answer :

For a consumer the most economical power factor is generally 0.95 lagging .

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Description :

Answer :

Load factor of a power station is generally less than unity.

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Description :

Answer :

Load factor of a power station is defined as average load/maximum demand.

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Description :

Answer :

An induction motor has relatively high power factor at near full load.

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67 views 1 answer
Description :

What is the maximum value of power factor?

Answer :

1 is the maximum value of power factor.

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Description :

A control system having unit damping factor will give  (1) Oscillatory response (2) Undamped response (3) Critically damped response (4) No response

Answer :

1

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749 views 2 answers
Description :

The damping factor of a particular system is unity, the system response will be

Answer :

The damping factor of a particular system is unity, the system response will be critically damped

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Description :

Answer :

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at 120°.

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Description :

Answer :

The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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Description :

Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Answer :

Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

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182 views 1 answer
Description :

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Answer :

In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

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Description :

Answer :

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

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Description :

In order to have a lower cost of electrical energy generation the load factor  (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high

Answer :

In order to have a lower cost of electrical energy generation the load factor and the diversity factor both should be high

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Description :

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

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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Description :

Answer :

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

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Description :

Answer :

Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

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Description :

Answer :

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

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Description :

The ratio of active power to apparent power is known as____ factor.

Answer :

The ratio of active power to apparent power is known as power factor.

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