# Series capacitors on transmission lines are of little use when the load VAR requirement is?

Series capacitors on transmission lines are of little use when the load VAR requirement is small.

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Answer : Series capacitors are used to compensate for line inductive reactance.

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)

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

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.

Description : 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

Answer : If a 5-bus test system contains 6 transmission lines and one transformer, 19 non-zero elements are there in the system Y-bus.

Description : In tuned power lines, on load :  (A) the receiving end voltage is numerically equal to the sending end voltage  (B) the receiving end current is numerically equal to the sending end current  (C) there is no voltage drop  (D) all the above

Answer : In tuned power lines, on load :  (A) the receiving end voltage is numerically equal to the sending end voltage  (B) the receiving end current is numerically equal to the sending end current  (C) there is no voltage drop  (D) all the above

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

Description : 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

Answer : The purpose of guard ring in transmission lines is to reduce the earth capacitance of the lowest unit.

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

Description : Series capacitive compensation in EHV transmission line is used to

Answer : To maintain voltage stability

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.

Description : Why dc series motor should not be started at no load?

Description : Explain series switching control of AC load. Single phase resistance load - Integral half cycle control Phase control - Resistance load

Description : Why ACSR conductor is used for overhead lines?

Answer : It has high tensile strength

Description : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

Answer : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

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

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.

Description : A minimum clearance of 6.3 m to ground is required for overhead lines when operating voltages are :  (A) less than 66 kV (B) lie between 66 kV and 110 kV (C) more than 165 kV (D) lie between 110 kV and 165 kV

Answer : A minimum clearance of 6.3 m to ground is required for overhead lines when operating voltages are : lie between 66 kV and 110 kV

Description : Why capacitors are used to improve power factor?

Answer :  Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

Description : Capacitors for power factor correction are rated in?

Answer : Capacitors for power factor correction are rated in kVAR.

Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

Description : What are the different types of capacitors?

Description : Which capacitors are suitable for DC filter circuits?

Answer : Electrolytic capacitors are suitable for DC filter circuits.

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

Answer : For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is 0.707 lead

Description : Capacitors

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Description : State any four types of capacitors.

Answer : Types of capacitors: i) Air capacitor ii) Paper capacitor iii) Mica capacitor iv) Ceramic capacitor v) Electrolytic capacitor vi) Poly-carbon capacitor

Description : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as

Answer : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.

Answer : The capacitors used in single-phase capacitor motors have no polarity marking.

Answer : Overhead lines for power supply to tramcars are at a minimum height of 10 m.

Description : How many volts are in the power lines?

Answer : When a wave propagates on a transmission line, it suffers reflection several times at sending and other end.

Answer : When a transmission line is energized, the wave that propagates on it is current wave and voltage wave.

Description : In a lamp load when more than one lamp are switched on the total resistance of the load?

Answer : In a lamp load when more than one lamp are switched on the total resistance of the load decreases.

Description : Find out number of data lines required to interface 16 LEDs arrange in the 4 x 4 matrix form.

Answer : 4+4=8, eight lines are required for 4x4 matrix of 16 LEDs

Description : Why don't we burry power lines underground ?

Answer : Because conductor used for power transmission are not insulated and if we do so it create phase to ground fault causing interruptions to supply.

Description : Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.

Answer : Magnetic Lines of force- These are the imaginary lines (having no physical existence) introduced by Faraday for the pictorial representation of the distribution of a magnetic field.  OR  A line of ... that the tangent at any point gives direction of the resultant force at that point.

Description : Define magnetic lines of force. Show the magnetic lines of force for bar type magnet.

Answer : Magnetic linens of force is the imaginary lines for magnetic field of magnet around it. These magnetic lines of forces are introduced by Michael Faraday. The direction of lines of force is from N-pole to S-pole. The figure shows lines of force for bar type magnet.

Description : Which of the following is the name given to the lines of electric force which move so that its beginning traces a closed curve on a positive surface and its end traces a corresponding closed curve on the negative surface? A) Tube of surface B) Tube of lines C) Tube of force D) Tube of electricity

Answer : Which of the following is the name given to the lines of electric force which move so that its beginning traces a closed curve on a positive surface and its end traces a corresponding closed curve on the negative ... A) Tube of surface B) Tube of lines C) Tube of force D) Tube of electricity

Description : What is a safe distance from power lines?

Description : In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

Answer : In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is : 0.075

Description : what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

Description : Two resistors are said to be connected in series when?

Answer : Two resistors are said to be connected in series when same current passes in turn through both.

Answer : If  equalising bar is connected to the 2 DC generators  the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar

Answer : When two D.C. series motors are connected in parallel, the resultant speed is normal speed.

Description : State the use of shunt and series resistance used in extension of meter.

Answer : Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

Answer : Generating capacity connected to the bus bars and ready to take load when switched on is known as spinning reserve.

Answer : When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

Description : Use of auto-transformer is economical when the transformation ratio is?

Answer : Use of auto-transformer is economical when the transformation ratio is near unity.

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