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Recent questions tagged transmission

1 answer 52 views

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

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 122 views

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 

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
1 answer 391 views

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

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 30 views

Stability of a transmission line can be increased by

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 27 views

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.

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

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

asked May 8, 2018 in Switchgear And Protection by Zeeshan
1 answer 115 views

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 

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 23 views

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

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 70 views

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

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 50 views

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

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 89 views

A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of

asked May 3, 2018 in Electric Power Transmission by Shimroz123
1 answer 82 views

The purpose of guard ring in transmission lines is to  (1) reduce the earth capacitance of the lowest unit. (2) increase the earth capacitance of the lowest unit. (3) reduce the transmission lines losses. (4) reduce the reactance of the line

asked May 1, 2018 in Electric Power Transmission by Shimroz123
1 answer 43 views

For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Series capacitive compensation in EHV transmission line is used to

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 85 views

Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 36 views

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

asked Apr 28, 2018 in High voltage engineering by Shimroz123
1 answer 24 views

The power flow problem mathematical model for a linear transmission network (A) is non-linear (B) is linear (C) considers time variation of generation (D) does not consider tap-changing transformers

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 27 views

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

asked Apr 28, 2018 in Power system by Shimroz123
2 answers 95 views

The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph, respectively. If the resistance drop is 150 V/ph and receiving end power factor is 0.8, the sending end power factor is (A) 0.745 lagging (B) 0.775 lagging (C) 0.8 lagging (D) 0.85 lagging

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 24 views

Precise control of reactive current flow entering the transmission and distribution systems can be minimized by using (A) synchronous condenser (B) static VAR capacitor (C) capacitor bank (D) thyristor switched reactor in parallel with capacitor

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 106 views

If a 5-bus test system contains 6 transmission lines and one transformer, how many non-zero elements are there in the system Y-bus ? (A) 25 (B) 12 (C) 11 (D) 19

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 23 views

Transmission efficiency of a transmission line increases with the

asked Apr 26, 2018 in Switchgear And Protection by Shimroz123
1 answer 26 views

The standard for long distance analog signal transmission in process control industry is (A) 4-20 mV (B) 0-20 mA (C) 4-20 mA (D) 0-5 V

asked Apr 26, 2018 in Control System by Shimroz123
0 answers 58 views

Why is voltage increases before transmission?

asked Mar 10, 2018 in Extra high voltage transmission by Quiz
1 answer 40 views

What is meant by extra high voltage transmission?

asked Mar 10, 2018 in Extra high voltage transmission by Quiz
1 answer 29 views

What is the job of a servo in a transmission?

asked Mar 10, 2018 in Control System by Quiz
0 answers 14 views

What are the losses in a transmission line?

asked Mar 10, 2018 in High voltage engineering by Quiz
2 answers 156 views

Why high voltage is used in power transmission?

asked Mar 10, 2018 in High voltage engineering by Quiz
0 answers 326 views

What are the advantages of high voltage transmission?

asked Mar 10, 2018 in High voltage engineering by Quiz
2 answers 58 views

Why transmission voltages are high?

asked Dec 16, 2017 in Extra high voltage transmission by Quiz
1 answer 76 views

What is electric power generation transmission and distribution?

asked Dec 16, 2017 in Electric Power Distribution by Quiz
1 answer 55 views

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

asked Dec 5, 2017 in Electric Power Transmission by Quiz
1 answer 43 views

what is mean by medium transmission line ?

asked Aug 18, 2017 in Electrical Engineering by Zeeshan
1 answer 41 views

what is mean by short transmission line ?

asked Aug 18, 2017 in Electrical Engineering by Zeeshan
1 answer 41 views

what is mean by long transmission line ?

asked Aug 18, 2017 in Electrical Engineering by Zeeshan
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