What is the best power factor?

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asked Mar 10, 2018 by anonymous

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What is the use of power factor correction?

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What is the advantage of high power factor?

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What is power factor angle?

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Can you have a power factor greater than 1?

Last answer: We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current.

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Why do we need to correct power factor?

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How do you measure power factor?

Last answer: P= 1.83*V*I*COS@ where P is power V is voltage I is current COS @ is P.F COS@= P/(1.83*V*I) in other way cos @ = true power/apparent power

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asked May 17, 2020 by anonymous

What is the value of capacitance required to improve power factor from 0.7 to 0.9.

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asked Apr 29, 2018 by anonymous

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

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asked Mar 19, 2018 by anonymous

What is the maximum value of power factor?

Last answer: 1 is the maximum value of power factor.

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asked Mar 16, 2018 by anonymous

What is the power factor of purely resistive circuit?

What is the power factor of purely resistive circuit.

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What is the best frequency response?

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asked Apr 28, 2018 by anonymous

The benefit of power factor correction in a power system is

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

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

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asked Mar 25, 2018 by anonymous

The power factor of a D.C. circuit is always?

Last answer: The power factor of a D.C. circuit is always unity.

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asked Mar 25, 2018 by anonymous

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

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

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asked Mar 25, 2018 by anonymous

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

Last answer: The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.

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asked Mar 25, 2018 by anonymous

The power factor at resonance in R-L- C parallel circuit is?

Last answer: since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.

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asked Mar 25, 2018 by anonymous

Power factor of the system is kept high?

Last 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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91 views 1 answer

asked Mar 21, 2018 by anonymous

In a single phase power factor meter the phase difference between the currents in the two pressure coils is?

Last answer: In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

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asked Mar 21, 2018 by anonymous

In a low power factor wattmeter the compensating coil is connected?

Last answer: In a low power factor wattmeter the compensating coil is connected in series with pressure coil.

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asked Mar 21, 2018 by anonymous

In a low power factor wattmeter the pressure coil is connected?

Last answer: In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.

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asked Mar 20, 2018 by anonymous

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?

Last 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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asked Mar 20, 2018 by anonymous

The power factor of a single-phase induction motor is usually?

Last answer: The power factor of a single-phase induction motor is usually lagging.

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asked Mar 20, 2018 by anonymous

For a consumer the most economical power factor is generally?

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

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asked Mar 20, 2018 by anonymous

The primary reason for low power factor is supply system is due to installation of?

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

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asked Mar 20, 2018 by anonymous

The power loss is an important factor for the design of?

Last answer: The power loss is an important factor for the design of transmission line.

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asked Mar 19, 2018 by anonymous

Minimum voltage regulation occurs when the power factor of the load is?

Last answer: Minimum voltage regulation occurs when the power factor of the load is leading.

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asked Mar 18, 2018 by anonymous

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

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

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asked Mar 18, 2018 by anonymous

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

Last 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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asked Mar 18, 2018 by anonymous

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

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

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asked Mar 8, 2018 by anonymous

Why the power factor of semiconverter is better than full converter?

Last answer: Power factor of semiconverter is better than full converter

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asked Mar 3, 2018 by anonymous

At which time power factor of the induction motor is low?

Last answer: The power factor of the inducction motor is low at the time of starting as compare to while the induction motor is running.

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asked Apr 30, 2018 by anonymous

A transformer has negative voltage regulation when its load power factor is

A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging

Last answer: Leading

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asked Mar 25, 2018 by anonymous

Power factor of electric bulb is?

Last answer: Power factor of electric bulb is unity.

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asked Mar 25, 2018 by anonymous

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

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

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asked Mar 24, 2018 by anonymous

Power factor of an electrical circuit is equal to?

Last answer: Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.

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asked Mar 20, 2018 by anonymous

Load factor of a power station is generally?

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

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asked Mar 20, 2018 by anonymous

Load factor of a power station is defined as?

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

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asked Mar 18, 2018 by anonymous

At which power factor alternator is said to be overexcited?

Last answer: At leading power factor alternator is said to be overexcited.

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asked May 22, 2020 by anonymous

State the effects of low power factor on efficiency and voltage regulation of short transmission lines.

Last answer: i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor)

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asked May 17, 2020 by anonymous

Briefly explain how the power factor of an inductive circuit can be improved.

Last answer: As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.

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asked Sep 22, 2018 by anonymous

State the incentives and penalties related with power factor tariff.

Last answer: Incentives and penalties related with power factor tariff: In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff) the tariff in which P.F. of ... industrial consumer/H.T/ commercial consumers with contract demand above 80 kw/ 100Kva/107 hp consumer.

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52 views 1 answer

asked Sep 6, 2018 by anonymous

State the significance of power factor.

Last answer: Significance of power factor:- 1. Cosine of angle between voltage & current in a circuit is called power factor. 2. It is a measure of the real power in a circuit. 3. Inductive & ... KVA rating equipment 5. Greater conductor size 6. CosØ = R/Z CosØ= Active Power/ Apparent Power

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36 views 1 answer

asked Apr 30, 2018 by anonymous

The power factor of dielectric :

The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

Last answer: The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

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58 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, 0.866 pu (B) 0.866 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

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50 views 1 answer

asked Mar 21, 2018 by anonymous

The power factor of a single phase load can be calculated if the instruments available are?

Last 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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135 views 2 answers

asked Mar 21, 2018 by anonymous

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

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

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80 views 1 answer

asked Mar 21, 2018 by anonymous

The two pressure coils of a single phase power factor meter have?

Last answer: The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

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72 views 1 answer

asked Mar 20, 2018 by anonymous

The standard full-load power factor ratings for synchronous motors are?

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

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66 views 1 answer

asked Mar 20, 2018 by anonymous

In a distribution system, in order to improve power factor, the synchronous capacitors are installed?

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

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104 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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69 views 1 answer

ss771980 · Answer 1 · 2018-03-10T04:40:58+0000

answered Mar 10, 2018 by ss771980

It is unity power factor but difficult to achieve in dynamic loads

What is the best power factor?

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