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What is meant by power dip?

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Description : What is meant by feeder in power system?

Answer : A feeder line is a peripheral route or branch in a network which connects smaller or more remote nodes with a route or branch carrying heavier traffic. The term is applicable to any system based on a hierarchical network.

Description : What is the use of power factor correction?

Description : What is the best power factor?

Answer : It is unity power factor but difficult to achieve in dynamic loads

Description : What is power factor angle?

Description : What is a digital power meter?

Description : What is an RF Power Meter?

Description : What causes random power outages?

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

Description : What is power logger?

Description : What are the power quality disturbance?

Description : What is harmonic in power quality?

Description : What is a power quality analyzer?

Description : What is power quality meter?

Description : What are the different power quality issues?

Description : What is good power quality?

Description : What is power quality monitoring?

Description : What can you do to prevent a power surge?

Description : What would cause a power surge in a house?

Answer : If your neibour / other flat owners / your maintainer staff switch on any type of inductive load that can cause power surge / dip  

Description : Can you have a power factor greater than 1?

Answer : We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current. 

Description : Why do we need to correct power factor?

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

Description : Can a power surge erase a hard drive?

Description : Can power surge damage your computer?

Description : How often do power surges occur?

Answer : Power quality is important because the electrical appliances will works better and will be safer and less loss in energy. Low energy waste and improves stability of power system .

Answer : By applying various power quality monitoring devices and using telecommunication technique .

Description : What is meant by KVA?

Answer : KVA - kilo volt ampere  Used to specify the transformer details

Description : What is meant by a voltage surge?

Description : What is mean by power switching devices?

Answer : Power switching devices means like BJT, power MOSFET, SCR, TRIAC, GTO etc.

Description : Find power delivered by voltage source

Answer : Find power delivered by voltage source

Description : Explain energy conservation technique “by improving power quality” for induction motor.

Answer : Energy conservation method in induction motor by improving power quality: Electrical energy can be conserved by improving the power quality. It can be achieved by avoiding voltage unbalance, maintaining ... losses can be minimized by using harmonic filter thus reducing the harmonics in the system.

Description : _______ electric power is the most common method used by electrical grids to transfer power.  (A) One-phase (B) Two-phase (C) Three-phase (D) None of the above

Answer : Three-phase electric power is the most common method used by electrical grids to transfer power. 

Description : The stability of the power system is not affected by  (1) generator reactance (2) line reactance (3) line losses (4) output torque

Answer : The stability of the power system is not affected by line losses

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

Description : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Answer : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

Description : steady-state stability of a power system is improved by

Answer : steady-state stability of a power system is improved by using double circuit line instead of single circuit line

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 ... (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

Description : The mechanical power developed by the armature of a d.c. motor is equal to?

Answer : The mechanical power developed by the armature of a d.c. motor is equal to armature current multiplied by back e.m.f.

Description : The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

Answer : The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is 6 kVAR.

Description : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

Answer : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.

Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

Answer : In case of locomotives the tractive power is provided by double cylinder, double acting steam engine.

Answer : The electrical power to a meggar is provided by permanent magnet D.C. generator.

Description : In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be?

Answer : In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be 0.5.

Description : In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?

Answer : In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was unity.

Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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

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

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

Description : The maximum load that a power transformer can carry is limited by its?

Answer : The maximum load that a power transformer can carry is limited by its voltage ratio.

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