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

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

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

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.

465 views 1 answer

asked Mar 25, 2018 by anonymous

An alternator coupled to a _____ runs at slow speed, as compared to others.

Last Answer : An alternator coupled to a hydraulic turbine runs at slow speed, as compared to others.

105 views 1 answer

asked Mar 20, 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.

593 views 1 answer

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.

139 views 1 answer

asked Mar 18, 2018 by anonymous

Explain the concept of lagging and leading phase angle by waveform.

Explain the concept of lagging and leading phase angle by waveform.
Last Answer : i) Leading phase angle : When two ac quantities of same frequency do not attain their respective zero or peak values simultaneously, then the quantities are said to be out-of-phase quantities. The ... Similarly, in the second diagram, the voltage is said to be lagging the current by Φ.

375 views 1 answer

asked Apr 27, 2020 by anonymous

The load duration curve for unity load factor will be of

The load duration curve for unity load factor will be of (1) Rectangular shape (2) Triangular shape (3) L -shape (4) I -shape
Last Answer : The load duration curve for unity load factor will be of Rectangular shape

1.5k views 1 answer

asked Apr 30, 2018 by anonymous

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

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

405 views 1 answer

asked Apr 26, 2018 by anonymous

Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform
Last Answer : When two alternating quantities attain their respective zero or peak values simultaneously, the quantities are said to be in-phase quantities. When the quantities do not attain their respective zero or ... current is leading the voltage or the voltage is said to be lagging behind the current.

139 views 1 answer

asked Sep 7, 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.

200 views 1 answer

asked Sep 6, 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

207 views 1 answer

asked Apr 29, 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.

296 views 2 answers

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°.

352 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.

158 views 1 answer

asked Mar 21, 2018 by anonymous

Explain how sinusoidal AC voltage is generated by using simple one loop generator.

Explain how sinusoidal AC voltage is generated by using simple one loop generator.
Last Answer : An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform.

1.4k views 1 answer

asked Sep 7, 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

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

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.

221 views 1 answer

asked Mar 19, 2018 by anonymous

State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.

State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.
Last Answer : Types of radioactive waste: The waste produced in nuclear power plant is in the form of solid, liquid & gases, 1. Solid Waste Disposal:- Solid wastes removed from the reactor are very ... are measured. If it is safe then released to atmosphere at high level through large height chimney.

129 views 1 answer

asked Sep 8, 2018 by anonymous

For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed

203 views 0 answers

asked Aug 12, 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.

175 views 1 answer

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.

307 views 1 answer

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.

126 views 1 answer

asked Mar 18, 2018 by anonymous

A synchronous motor has better power factor as compared to that of an equivalent induction motor...

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

169 views 1 answer

asked Mar 20, 2018 by anonymous

Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.

207 views 0 answers

asked Apr 16, 2020 by anonymous

Write the relation between phase and line current, phase and line voltage for Star connection.

Write the relation between phase and line current, phase and line voltage for Star connection.
Last Answer : Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection

374 views 2 answers

asked Aug 11, 2018 by anonymous

What is line voltage and phase voltage?

What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.

125 views 0 answers

asked Aug 11, 2018 by anonymous

Draw the waveform of three phase AC supply voltage.

212 views 0 answers

asked Aug 11, 2018 by anonymous

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm
Last Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

755 views 1 answer

asked Apr 28, 2018 by anonymous

What is the difference between line and phase voltage?

What is the difference between line and phase voltage?
Last Answer : Line voltage is voltage between two phases R &Y (415 v) while phase voltage is the voltage between one phase and a neutral B & N (240 v).

207 views 1 answer

asked Mar 10, 2018 by anonymous

Why the read of 3 phase voltage is 440?

Why the read of 3 phase voltage is 440?
Last Answer : The read of a phase voltage should be approximatly 240v. This is because line voltage equals to quberoot of phase voltage.

96 views 1 answer

asked Mar 10, 2018 by anonymous

Explain the principle of ON OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Last Answer : The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.

3.5k views 1 answer

asked Feb 14, 2018 by anonymous

What is the voltage in 3 phase line?

What is the voltage in 3 phase line?
Last Answer : between 430 to 440 v

283 views 4 answers

asked Dec 22, 2017 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°.

132 views 1 answer

asked Mar 21, 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.

189 views 1 answer

asked Mar 20, 2018 by anonymous

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)

354 views 1 answer

asked May 22, 2020 by anonymous

The product of apparent power and cosine of the phase angle between circuit voltage and current is?

The product of apparent power and cosine of the phase angle between circuit voltage and current is?
Last Answer : In parllpar reasonans RLC circuit the current is

647 views 2 answers

asked Mar 25, 2018 by anonymous

The power consumed in a circuit element will be least when the phase difference between the current and voltage is?

The power consumed in a circuit element will be least when the phase difference between the current and voltage is?
Last Answer : The power consumed in a circuit element will be least when the phase difference between the current and voltage is 90°.

939 views 1 answer

asked Mar 24, 2018 by anonymous

The power factor of industrial loads is generally (a) unity (b) lagging (c) leading (d) zero

The power factor of industrial loads is generally (a) unity (b) lagging (c) leading (d) zero
Last Answer : (b) lagging

9 views 1 answer

asked Jul 24, 2021 by itszee

220kV three phase transmission line is 60 km long. The resistance is 15 Ohms per phase and the inductance is j 30 Ohms. 1- Calculate : voltage regulation, TL line power losses and efficiency when the line is suppling 315 MW at 0.6 lagging power factor . 2- Assume that, a capacitor can be installed with the load in parallel to correct (improve) the power factor for 0.85, calculate zise of the required capacitor and the same parameters which were in part 1

220kV three phase transmission line is 60 km long. The resistance is 15 Ohms per phase and the inductance is j 30 Ohms. 1- Calculate : voltage regulation, TL line power losses and efficiency when ... for 0.85, calculate zise of the required capacitor and the same parameters which were in part 1

22 views 0 answers

asked Apr 4, 2021 by farah

How to download personal unity not via UnityDownloadAssistant?

How to download personal unity not via UnityDownloadAssistant?
Last Answer : You have to download the installer first before you can install Unity. You can't get around that. Go here http://unity3d.com/ and click Get Unity. Then scroll down and click on ... pay the $75 per month license fee regardless whether you downloaded the personal edition or the professional edition

1 view 1 answer

asked Mar 1 by anonymous

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz
Last Answer : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz

171 views 1 answer

asked Jun 18, 2018 by anonymous

Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is
Last Answer : Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16

1.0k views 1 answer

asked May 8, 2018 by anonymous

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1
Last Answer : A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system crosses the real axis at -0.1.

263 views 1 answer

asked Apr 28, 2018 by anonymous

The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for

The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for
Last Answer : The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for all frequencies

243 views 1 answer

asked Apr 26, 2018 by anonymous

What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute?

What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these
Last Answer : What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

2.6k views 1 answer

asked Apr 29, 2018 by anonymous

List at least two examples that show how static electricity can be generated.

List at least two examples that show how static electricity can be generated.
Last Answer : Examples of how static electricity can be generated include combing your hair, walking across a carpeted room, or sliding two pieces of plastic across each other.

202 views 1 answer

asked Jun 29, 2019 by anonymous

How eddy currents are generated?

69 views 0 answers

asked Mar 14, 2018 by anonymous

Is electricity generated in AC or DC?

Is electricity generated in AC or DC?
Last Answer : Electricity is generated in AC.

129 views 1 answer

asked Mar 10, 2018 by anonymous

anonymous · Answer 1 · 2018-03-18T18:56:20+0000

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.

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

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