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What is meant by extra high voltage transmission?
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HT & LT  two types transmission in industrial line 
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Description :

What is Extra High Voltage?

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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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3.5k views 1 answer
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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34 views 1 answer
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 :

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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127 views 2 answers
Description :

What is the definition of extra low voltage?

Answer :

Extra-low voltage (ELV) is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock.

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123 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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125 views 1 answer
Description :

Why is voltage increases before transmission?

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Description :

What is a high voltage test?

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Description :

What is considered low voltage and high 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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71 views 1 answer
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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109 views 1 answer
Description :

Limitation and application of High Voltage DC (HVDC)

Answer :

Limitation and application of High Voltage DC (HVDC) :  Limitation:- 1) It is difficult to step up and step down DC voltage like AC voltage. 2) Special cooling ... conventional/non-conventional) 12) Increasing existing grid utilization. 13) Interconnection of different grids or networks

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92 views 1 answer
Description :

Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Answer :

Step-down transformer converts high voltage and low current into: Low voltage and high current

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Description :

Answer :

For measurements on high voltage capacitors, the suitable bridge is Schering bridge.

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Description :

Answer :

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

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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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Description :

Answer :

yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns.

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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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327 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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3.4k views 2 answers
Description :

What is a high tension power line?

Answer :

High tension power line is a high voltage of 115 kv and power line is underground transimissio used by urbun areas

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Description :

What is meant by pinch off voltage in MOSFET?

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Description :

What is meant by flash over voltage?

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Description :

What is meant by a voltage surge?

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Description :

what is mean by medium transmission line ?

Answer :

The transmission line which have length between 80 km to 250 km is known as medium transmission line.

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Description :

what is mean by short transmission line ?

Answer :

The transmission lines which have length less than 80 km is known as short transmission lines.

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Description :

what is mean by long transmission line ?

Answer :

The transmission line which have length more than 250 km are known as long transmission lines.

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76 views 1 answer
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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110 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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Description :

For extra high voltage ac transmission lines, conductors used are (a) All aluminium (b) All steel (c) AAAC (d) ACSR

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Description :

What can cause high amperage on a motor?

Answer :

High  amperage  can  result  in  a motor  when the  amount  of  load  increases. when  load  increases  , it  reduces  the  rotor  speed which  increases  the  slip  at  constant  synchronous  speed ... ,  as  a  result  more  current  shall  have  been  drawn  to  maintain  the  additional  load.

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60 views 1 answer
Description :

What is the advantage of high power factor?

Answer :

Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

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82 views 2 answers
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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118 views 1 answer
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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301 views 1 answer
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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115 views 1 answer
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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103 views 1 answer
Description :

Answer :

The interaction between a transmission line and communication line is minimized by transposing transmission as well as communication lines, increasing the height of the transmission line tower, increasing the distance between the two lines.

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Description :

Answer :

A transmission line is protected by distance protection, time graded and current graded overcurrent protection.

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Description :

What is the advantage of AC over DC electrical transmission?

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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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79 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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263 views 1 answer
Description :

What is the job of a servo in a transmission?

Answer :

servo motor use in many types mechanism so its verius type of transmission wich type you need to know 

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72 views 1 answer
Description :

What are the losses in a transmission line?

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Description :

What is electric power generation transmission and distribution?

Answer :

Generation: it wrong word at here.because it is no generation it is conversion of one form of energy into electrical form.it may by using any type of energy. Transmission is just to ... place to other by providing some modifications And distribution means use of this energy for any purpose.

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129 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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50 views 1 answer
Description :

Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

Answer :

Methods for measurement of low resistance:  1. Ammeter voltmeter method  2. Kelvin's bridge method  3. Ohm meter method  4. Potentiometer method  5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible.  2. Connection errors.

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2.6k views 1 answer
Description :

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer :

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

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86 views 1 answer
Description :

Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

Answer :

Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

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159 views 1 answer
Description :

The number of cycles in which a high speed circuit breaker can complete its operation is  (A) 3 to 8 (B) 10 to 18 (C) 20 to 30 (D) 40 to 50

Answer :

The number of cycles in which a high speed circuit breaker can complete its operation is 3 to 8

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