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If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.

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Description :

Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Answer :

Dielectric loss in a capacitor is best measured by Schering Bridge

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107 views 1 answer
Description :

Why high voltage can reduce power loss?

Answer :

when voltage has increased due to reduced current flow, thus power loss given by ( I^2R) will be low due to reduced current(I^2) provided that resistance (R) is constant.

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Description :

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems to step up high voltage signals and provide extra high voltage C) It is a transformer used in power systems to step down extra high voltage signals and provide low voltage D) None of these

Answer :

What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these

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Description :

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

Answer :

In parllpar reasonans RLC circuit the current is

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Description :

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

Answer :

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2

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329 views 1 answer
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 :

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.

Answer :

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of 45 degrees.

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Description :

How to find total impedance Z, current I and Impedance angle ?

Answer :

How to find total impedance Z, current I and Impedance angle ?

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Description :

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Answer :

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

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82 views 1 answer
Description :

In a loss-free R-L-C circuit the transient current is?

Answer :

In a loss-free R-L-C circuit the transient current is sinusoidal.

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300 views 1 answer
Description :

A ferrite core has less eddy current loss than an iron core because?

Answer :

A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

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309 views 1 answer
Description :

What is the difference between eddy current and hysteresis loss?

Answer :

Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

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Description :

Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Answer :

Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

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Description :

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

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.

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Description :

What is meant by firing angle of thyristor?

Answer :

The point at which SCR is triggered is known as firings angle of thyristor.

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Description :

The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.

Answer :

The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes 10 ohms.

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Description :

Answer :

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.

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Description :

Answer :

If the supply frequency to the transformer is increased, the iron loss will increase.

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Description :

Corona loss in transmission lines can be reduced by (A) using small diameter conductors (B) using bundled conductors (C) using less spacing between conductors (D) increasing the transmission line voltage

Answer :

Corona loss in transmission lines can be reduced by using bundled conductors

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Description :

Answer :

Iron loss of a transformer can be measured by low power factor wattmeter.

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Description :

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Answer :

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

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Description :

When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is ?

Answer :

When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is all right.

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Description :

Answer :

Commonly used standard capacitor is concentric cylindrical type.

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Description :

What is the maximum value of torque angle in synchronous motor?

Answer :

The maximum value of torque angle in synchronous motor is 90 degrees electrical.

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Description :

Define: i) Firing angle ii) Conduction angle

Answer :

(i) Conduction Angle (β): Conduction angle is defined as the angle between the instant the SCR is triggered or turned on and the instant at which the SCR is turned off. Assuming that the SCR ... maximum average output voltage to the angle when the SCR is actually triggered or fired by gate pulse.

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Description :

Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

Answer :

Phase margin is the amount of angle to make the system Unstable 

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Description :

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

Answer :

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

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Description :

What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?

Answer :

90° will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value.

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Description :

Two waves of the same frequency have opposite phase when the phase angle between them is?

Answer :

Two waves of the same frequency have opposite phase when the phase angle between them is 180°.

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Description :

Tangent of angle of friction is equal to?

Answer :

Tangent of angle of friction is equal to coefficient of friction.

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Description :

Angle of friction is the?

Answer :

Angle of friction is the angle between normal reaction and the resultant of normal reaction and the limiting friction.

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Description :

Answer :

The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.

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146 views 1 answer
Description :

The synchronous motor will develop maximum power when the load angle is?

Answer :

The synchronous motor will develop maximum power when the load angle is 900.

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Description :

What is power factor angle?

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Description :

what is firing angle?

Answer :

Firing angle is time in electrical degrees from the instant the valve voltage is positive to the application of firing pulse to the valve (start of conduction). Also called delay angle.

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Description :

Does current flow through a capacitor ?

Answer :

Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

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Description :

In a magnetic material hysteresis loss takes place primarily due to?

Answer :

In a magnetic material hysteresis loss takes place primarily due to it high retentivity.

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Description :

In a circuit containing R, L and C, power loss can take place in?

Answer :

In a circuit containing R, L and C, power loss can take place in R only.

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Description :

Answer :

In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

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Description :

Answer :

In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

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Description :

Answer :

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

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Description :

Answer :

If the capacitor of a single-phase motor is short-circuited the motor will not start.

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Description :

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Answer :

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

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Description :

At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

Answer :

At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W

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Description :

Answer :

In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

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Description :

What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero

Answer :

What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero

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Description :

Answer :

Corona is nothing but the ionization of surrounding air around the conductor which produces hissing noise,

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73 views 1 answer
Description :

State the factors affecting hysteresis loss.

Answer :

i) Flux density ii) Frequency iii) Volume of the magnetic material iv) Nature of magnetic material

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Description :

Answer :

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

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Description :

How can power loss be reduced?

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