The power factor of an alternator depends on?

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The power factor of an alternator depends on?

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asked Mar 18, 2018 by anonymous

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Related Questions

At which power factor alternator is said to be overexcited?

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 Mar 18, 2018 by anonymous

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

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
Last 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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asked Mar 18, 2018 by anonymous

The magnitude of various voltage drops that occur in an alternator depends on?

The magnitude of various voltage drops that occur in an alternator depends on?
Last Answer : The magnitude of various voltage drops that occur in an alternator depends on load current.

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asked Mar 18, 2018 by anonymous

State working principle of alternator. State the meaning self and separate excitation.

State working principle of alternator. State the meaning self and separate excitation.
Last Answer : Working principle of alternator: When a conductor is moved in magnetic field or a magnetic field moved with respect to conductor, according to Faraday's law of electromagnetic induction, the conductor ... like battery or shaft-mounted exciter, then the excitation is said to be separate excitation.

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asked May 27, 2020 by anonymous

Explain the construction of alternator with neat diagram.

Explain the construction of alternator with neat diagram.
Last Answer : Diagram: Construction of three phase alternator: Construction wise, an alternator generally consists of field poles placed on the rotating fixture of the machine i.e. rotor as shown in the ... of rotor used in construction of alternator, 1. Salient pole type. 2. Cylindrical rotor type.

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asked Jul 30, 2019 by anonymous

Is the speed of alternator is directly proportional to frequency?

Is the speed of alternator is directly proportional to frequency?
Last Answer : Yes, speed of alternator is directly proportional to frequency.

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asked Mar 18, 2018 by anonymous

In alternator where the voltage drop occurs?

In alternator where the voltage drop occurs?
Last Answer : In alternator voltage drop occurs in armature resistance, leakage reactance, and armature reactance.

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asked Mar 18, 2018 by anonymous

What is meant by Power factor?

What is meant by Power factor?
Last Answer : Ans. Power factor means ratio of true power to apparent power. It is cosine of phase angle between voltage and current. Its value is 1 for Unity P.F. Loads, 0 to 1 lagging for inductive loads and o to 1 leading for capacitive loads.

17 views 1 answer

asked Jun 20, 2021 by itszee

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

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)

359 views 1 answer

asked May 22, 2020 by anonymous

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

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.

183 views 1 answer

asked May 17, 2020 by anonymous

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

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

197 views 0 answers

asked May 17, 2020 by anonymous

Why capacitors are used to improve power factor?

Why capacitors are used to improve power factor?
Last 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.

183 views 3 answers

asked Aug 18, 2019 by anonymous

Discuss how power factor tariff results into energy conservation.

Discuss how power factor tariff results into energy conservation.
Last Answer : Power factor tariff results into energy conservation: i) Applying incentives and penalties according to power factor is an effective way, which enables consumer to improve power factor so that he can ... finally leads to reduction in the current drawn by the load and helps for energy conservation.

2.6k views 1 answer

asked Sep 29, 2018 by anonymous

Draw and explain bulk correction method for power factor & control.

Draw and explain bulk correction method for power factor & control.
Last Answer : Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95).

113 views 1 answer

asked Sep 29, 2018 by anonymous

State the incentives and penalties related with power factor tariff.

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.

142 views 1 answer

asked Sep 22, 2018 by anonymous

With a neat sketch explain working of 1 phase dynamometer type power factor meter.

With a neat sketch explain working of 1 phase dynamometer type power factor meter.
Last Answer : Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load.

202 views 1 answer

asked Sep 6, 2018 by anonymous

State the significance of power factor.

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

57 views 1 answer

asked Sep 6, 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 : 0

5.1k views 3 answers

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)

167 views 1 answer

asked Apr 30, 2018 by anonymous

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh
Last Answer : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh

148 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

340 views 1 answer

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
Last Answer : 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

209 views 1 answer

asked Apr 29, 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

104 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

98 views 1 answer

asked Apr 28, 2018 by anonymous

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

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

219 views 1 answer