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How can power loss be reduced?
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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 :

How do you calculate power loss?

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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 :

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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Answer :

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

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Description :

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

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Answer :

The speed of a universal motor is generally reduced by using gear trains.

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

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Answer :

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

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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 :

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 :

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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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 :

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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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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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 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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Answer :

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

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Answer :

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

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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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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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Answer :

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

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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 :

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

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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Description :

A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator

Answer :

A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators

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Description :

In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals

Answer :

In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage

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Description :

Is more power dissipated in series or parallel?

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Description :

What is a safe distance from power lines?

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Description :

Why high voltage is used in power transmission?

Answer :

The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows ... This means that thin, light-weight wires can beused in long-distance transmission.

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Description :

How can we improve power factor using synchronous motor?

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Description :

Corona loss can be reduced by the use of hollow conductors because?

Answer :

Corona loss can be reduced by the use of hollow conductors because of better ventilation in the conductor.

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310 views 1 answer
Description :

The resolving power of a spectrometer consisting of collimator, a grating and a telescope can be increased by (A) increasing the angular magnification of the telescope (B) increasing the period of the grating (C) decreasing the period of the grating (D) decreasing the slit-width of the collimator

Answer :

The resolving power of a spectrometer consisting of collimator, a grating and a telescope can be increased by decreasing the period of the grating

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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 :

Answer :

Approximate estimation of power demand can be made by load survey method, statistical methods, mathematical method, economic parameters.

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Description :

Answer :

The inductive interference between power and communication line can be minimized by transposition of the power line, transposition of the communication line.

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Description :

Answer :

The steady state stability of the power system can be increased by connecting lines in parallel.

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Description :

Why noise of motor is produced? How it can be reduced?

Answer :

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Description :

Explain how technical losses can be reduced by use of energy efficient transformer in Transmission and Distribution system.

Answer :

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Description :

How can the steady-state error in a system be reduced?  (1) By decreasing the type of system (2) By increasing system gain (3) By decreasing the static error constant (4) By increasing the input

Answer :

How can the steady-state error in a system be reduced?  (1) By decreasing the type of system (2) By increasing system gain (3) By decreasing the static error constant (4) By increasing the input

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196 views 1 answer
Description :

Discuss how power factor tariff results into energy conservation.

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.

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2.6k views 1 answer
Description :

How many volts does it take to power an Arduino?

Answer :

5volts is enough to supply the Arduino.

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Description :

How many watts does a power plant produce?

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Description :

How much electricity is produced by a power plant?

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Description :

How much power does an Arduino use?

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Description :

How do you power an Arduino?

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Description :

How do you measure power factor?

Answer :

P= 1.83*V*I*[email protected] where P is power           V is voltage            I is current           COS @ is P.F [email protected]= P/(1.83*V*I)  in other way cos @ = true power/apparent power

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Description :

How often do power surges occur?

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Description :

How many volts are in the power lines?

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Description :

How does electricity get from the power plant to your home?

Answer :

Electricity  gets  into   my   home  due  to  potential  diffrence  created   between  the  live   wire  and  neutral  wire.

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