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Why is voltage increases before transmission?
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Description :

Transmission efficiency of a transmission line increases with the

Answer :

Transmission efficiency of a transmission line increases with the increase in power factor and voltage

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Description :

What is meant by extra high voltage transmission?

Answer :

HT & LT  two types transmission in industrial line 

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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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5.3k views 2 answers
Description :

State the advantages of use of high voltage in transmission of Electric power. 

Answer :

Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage. 

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Description :

The voltage of transmission can be regulated by  (A) Use of tap changing transformers (B) Switching in shunt capacitors at the receiving end during heavy loads (C) Use of capacitors to neutralize the effect of series reactance (D) Any of the above methods

Answer :

The voltage of transmission can be regulated by  (A) Use of tap changing transformers (B) Switching in shunt capacitors at the receiving end during heavy loads (C) Use of capacitors to neutralize the effect of series reactance (D) Any of the above methods

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72 views 1 answer
Description :

The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

Answer :

The permissible voltage variation in transmission and distribution system is: ±10%

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332 views 1 answer
Description :

If 3000 kW power is to be transmitted over a distance of 30 km, the desirable transmission voltage will be.  (A) 11 kV (B) 33 kV (C) 66 kV (D) 132 kV

Answer :

By

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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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113 views 1 answer
Description :

What are the advantages of high voltage transmission?

Answer :

Advantages:  1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases ... line increases  12. As transmission voltage increases power handling capacity of transmission line increases 

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3.6k views 1 answer
Description :

Why transmission voltages are high?

Answer :

If current is high then I2R losses will be more .If I2R losses is more then heat generated is more. By heat or increasing temperature resistance will also be increase which will decrease ... voltage we are decreasing current which is advantageous. That's why transmission voltages is high.

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Description :

Why does the speed of a DC shunt motor decrease as the load increases?

Answer :

Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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2.6k views 1 answer
Description :

Why is it cheaper to transmit electrical energy at high voltage?

Answer :

Because of the electrical energy was step upped by transformers the transformer have high efficiency than the electric energy is cheaper

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Description :

What happens to the resistance when the current increases?

Answer :

Resistance  reduces  when  current  increases.

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Description :

Why is AC better for long distance power transmission than DC ?

Answer :

ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.

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192 views 4 answers
Description :

Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?

Answer :

10kv plus to compensate losses in olden days 1kv were added and transmitted. Since all equipment used for transmission have a multiple of 11 from olden days, still that is being followed even though the losses are ... voltages, multiples of 11 is eazy for winding ratios.. i.e. 11kv to 33kv is 1:3.

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Description :

Why are overhead transmission lines not insulated?

Answer :

Insulators are useful to help separate electrical conductors when they come into physical contact. Overhead Transmission Lines Are Not Insulated: The overhead transmission line is carrying extreme high voltage and ... a whole lot of thick insulation to absorb the heat produced by such high voltage.

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Description :

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

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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113 views 1 answer
Description :

How many insulator disc used for 33 kV transmission voltage line?

Answer :

5,As 33kv is Vrms

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114 views 1 answer
Description :

State standard voltage in India for the following : (i) Generation Voltage (ii) Primary Transmission Voltage

Answer :

i. Generation Voltage : 3.3KV, 6.6KV,11KV and 17.5 KV  ii. Primary Transmission voltage :- 220 KV, 400KV, 765 KV (750 KV) 

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Description :

If 1-phase voltage is 220V, why is 3-phase 440V and not 660V ?

Answer :

Phase voltage =220v /( phase to neutral) Line voltage = 380 v ( phase to phase) Phase angle difference 120° So when two phases reach vmax +ve I.e. (+220v) + (+220v) = 440v that time due ... these event happen very fast. Hence we have 440 v only in three phase motor. √3.phase voltage= 380 v.

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Description :

Why inductor current lags inductor voltage ?

Answer :

Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor

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Description :

Why high voltage test is done?

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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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2.6k views 1 answer
Description :

Why does increase in current mean a decrease in voltage?

Answer :

This is because current flows from high potential to low potential to bring the two diffrent potential to unity , thus  a reduced potential (voltage)

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Description :

Why voltage divider bias is also called self bias?

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Description :

Why the read of 3 phase voltage is 440?

Answer :

The  read  of  a  phase  voltage  should be approximatly  240v. This  is  because  line  voltage  equals  to quberoot of  phase  voltage.

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Description :

About trnsformer

Answer :

Acc to Ohms law V=IR but it is only applicable when our resistance R is constant, as in case of transformer we take impedence which is equivalent to resistance is not constant it varies with system parameters that why Ohms law not applicable in case of transformer

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Description :

Answer :

already answered here is mosfet current controlled device?

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Description :

State the limitations of EHVAC transmission line. 

Answer :

Following are the Limitations of EHVAC Transmission:   1. Insulation cost increases as voltage increases 2. Skin effect is more 3. Proximity effect is more. 4. Corona loss increases. 5. Radio ... 18. EHVAC is economical only for bulk amount of power is to be transmitted over long distance. 

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Description :

Differentiate between overhead transmission and underground transmission.

Answer :

Points Overhead line  Underground cable Capital cost  Less More Erecting cost  Less More Time require for completion of work Less More Flexibility More ... Space consumed Space consumed  No space consumed Appearance Not good  Very good 

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42 views 1 answer
Description :

State line parameters of transmission line. 

Answer :

Following are the of Line parameters of transmission line:  1. Resistance  2. Inductance  3. Capacitance

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Description :

State features of wireless power transmission. 

Answer :

Features of wireless power transmission:  1. Energy delivered anywhere in the world 2. Zero fuel cost 3. Less losses 4. Less use of copper wires 5. More efficiency 6. Minimum long- ... on cables would never exist in the transmission.  7. Power theft would be not possible at all. 

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Description :

State the classification of transmission lines depending on length of transmission lines. 

Answer :

A) According to Voltage level: ( 2 Marks)  a) High voltage Transmission Line (HV) up to 33 KV  b) Extra High Voltage Transmission Line (EHV) above 33 KV up to 400 KV  c) Ultra ... Transmission Line: - The length of Long transmission Line is above 200KM and its line voltage is above 100KV

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Description :

State the impact of inductance and resistance on transmission line performance

Answer :

Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

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Description :

What is the advantage of AC over DC electrical transmission?

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Description :

effect of inductance and capacitance on performance of transmission line.

Answer :

Following are the effect on performance of transmission line:  1. Due to inductance (L) voltage drop in transmission line produces.  2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected. 

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Description :

While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method. 

Answer :

(i) Assumptions are made in case of Nominal 'T' Method:  a. It is assume that line capacitance is connected at center of transmission line. b. It is assume that half ... assumed that transmission line resistance & reactance per phase is connected in between two half transmission line capacitance 

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Description :

HVDC transmission line in India: 

Answer :

HVDC transmission line in India:  S.N .  From To  Voltage 1 Rihand (U.P) (from 1990) Dadri +- 500 KV (bipolar) 2 Talcher- is the biggest ... (Chandrapur) Western Region  140KV   8 Connecting Southern region(Vizag- Gajuwaka) Eastern Region 140KV 

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Description :

effect of line parameter on performance of transmission line. 

Answer :

Following are the effect of line parameter on performance of transmission line:  1. Due to resistance (R), voltage drop in transmission line & copper losses in transmission line ... transmission line efficiency, voltage regulation & also power factor of transmission line gets affected. 

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Description :

necessity of transmission of electricity.

Answer :

 Because of following points there is necessity of transmission of power:   1. Electrical load on power system is not concentrated at one place but it is widely spread.  2. Load ... to the point of actual utilization of it (consumers) for this purpose transmission electricity is necessary. 

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Description :

Obtain the relationship between the reflection and the transmission coefficients in terms of the intrinsic impedance of the respective mediums when a plane wave propagating normal to the reflection surface  between medium 1 and medium 2 reflects on the inter surface

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Description :

i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.

Answer :

Significance of modulation index in AM transmission  It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in ... amplitude part of its information is lost in the process of modulation which is undesirable.

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Description :

Compare characteristics of asynchronous and synchronous transmission mode (four points). 

Answer :

Synchronous transmission Asynchronous transmission 1. Synchronous transmission are synchronized by an external clock. 1. Asynchronous transmission are synchronized by special signals along the transmission ... for transferring a small amount of data as it is simple and economical.

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69 views 1 answer
Description :

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer :

(i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

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120 views 1 answer
Description :

A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

Answer :

A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

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265 views 1 answer
Description :

In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

Answer :

In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

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Description :

Stability of a transmission line can be increased by

Answer :

Stability of a transmission line can be increased by Shunt capacitor, Series capacitor

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Description :

The sag of a transmission line is least affected by (A) Self weight of the conductor. (B) Temperature of the surrounding air. (C) Current through the conductor. (D) Ice deposited on the conductor.

Answer :

The sag of a transmission line is least affected by Current through the conductor.

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Description :

In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 

Answer :

In a transmission line if booster transformers are to be used, preferred location will be At the intermediate point

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252 views 1 answer
Description :

In case the height of transmission tower is increased, which of the following parameter is likely to change?  (A) Resistance (B) Inductance (C) Capacitance (D) None of the above

Answer :

In case the height of transmission tower is increased, which of the following parameter is likely to change?  (A) Resistance (B) Inductance (C) Capacitance (D) None of the above

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273 views 1 answer
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