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Power System - 2 Paperback – 2009

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Answer : Technical losses: i) Copper losses ii) Unbalance loading iii) Long length of distribution lines iv) Conductor of inadequate size v) Various losses in transformer vi) Long distance between transformer and ... be the season behind this which is due to less interest of the line men in their work.

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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

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Description : With neat diagram explain use of “reactive power controller” to reduce technical losses in transmission and distribution system.

Answer : Reactive power compensation in Transmission and Distribution systems: The reactive power is present in lines due to the reactive loads and device/ component reactance. This leads to heavy currents for active ... switched to the line as per the requirement of lagging or leading reactive VA. 

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Description : Regulating transformers are used in power systems for control of : a) voltage b) power factor c) power flow d) all of the above

Answer : Regulating transformers are used in power systems for control of :  power flow 

Description : The maximum possible power of a 3-phase synchronous motor with synchronous reactance 0.8 p.u. connected to a bus-bar of 1.0 p.u. and excitation adjusted to 1.2 p.u. is (A) 0.5 p.u. (B) 0.96 p.u. (C) 1.5 p.u. (D) 1.8 p.u.

Answer : The maximum possible power of a 3-phase synchronous motor with synchronous reactance 0.8 p.u. connected to a bus-bar of 1.0 p.u. and excitation adjusted to 1.2 p.u. is 1.5 p.u.

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Answer : Answer: A

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

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Description : Explain how technical losses can be reduced by use of energy efficient transformer in Transmission and Distribution system.

Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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

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Answer : D) All of the above 

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Answer : Importance of electrical power in day to day life: 1. Electrical energy is the basic necessity for domestic (residency), commercial, industrial, agriculture, consumers , transport (Electric ... agriculture products. iv) Running motors, furnaces of various kinds in industry, running locomotives 

Description : Problems on electrical power and energy

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Answer : Problem on electrical power and energy 2

Description : Problem on electrical power and energy 1

Answer : Problem on electrical power and energy 1

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Answer : Problem on electrical power and energy 7

Description : Problem on electrical power and energy 6

Answer : Problem on electrical power and energy 6

Description : Problem on electrical power and energy 5

Answer : Problem on electrical power and energy 5

Description : A. active power B. reactive power C. apparent power D. A & C E. B & C

Description : List any two types of fuels used in electrical power generation plants.

Answer : Types of fuels used in electrical power generation plants:  1) Solid fuels: Coal, Biomass: Wood, Nuclear fuel: Uranium, Plutonium  2) Liquid fuels: Diesel, Petrol  3) Gaseous Fuels: Natural gas, Producer ... 2) Wood 3) Uranium 4) Plutonium 5) Diesel 6) Petrol 7) Natural gas 8) Producer gas

Description :

Answer : Much higher efficiency of transformer compared with that of electrical motors of the same power.

Description : When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

Answer : When an alternating current passes through an ohmic resistance the electrical power converted into heat is true power.

Description :

Power factor of an electrical circuit is equal to?

Answer : Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.

Description : Explain reactive power compensation in Transmission and Distribution systems.

Answer : Reactive power compensation in Transmission and Distribution systems: The reactive power is present in lines due to the reactive loads and device/ component reactances. This leads to heavy ... Diagram shows a scheme of reactive power compensation used in transmission and distribution systems. 

Description : Load compensation in power systems is a process to :  (A) Maintain better voltage profile (B) Increase short circuit capacity of the system (C) Generate required harmonics for loads like arc furnaces (D) Compensate for the line reactance

Answer : Load compensation in power systems is a process to : Maintain better voltage profile

Description : Regulating-transformers are used in power systems for control of

Answer : Regulating-transformers are used in power systems for control of power flow

Description : Reactors in commercial nuclear power plants in the U.S. are often referred to as thermal reactors. A thermal reactor uses: w) fissionable plutonium-239 as fuel. x) a relatively low heat output. y) neutrons moderated to relatively low energies. z) liquid sodium as a coolant.

Answer : ANSWER: Y -- NEUTRONS MODERATED TO RELATIVELY LOW ENERGIES.

Description : The form of the fuel in U.S. commercial nuclear power plants is which of the following: w) uranium oxide ceramic pellets x) atomic vapor y) uranium metal tubes z) uranium solution in water

Answer : ANSWER: W -- URANIUM OXIDE CERAMIC PELLETS

Description : An important safety feature required at U.S. nuclear power plants that was not present at the Chernobyl Power Plant in the Soviet Union was the: w) reactor x) cooling water y) control rods z) containment building

Answer : ANSWER: Z -- CONTAINMENT BUILDING

Description : The U.S. population receives the largest dose of ionizing radiation from: w) natural sources. x) fallout from nuclear weapons testing. y) nuclear medicine. z) nuclear power plants.

Answer : ANSWER: W -- NATURAL SOURCES.

Description : In a typical power plant used to generate electricity in the U.S., the percentage of energy in the fuel that is converted to electricity is about: w) 99 percent x) 50 percent y) 35 percent z) 10 percent

Answer : ANSWER: Y -- 35 PERCENT 

Description :

Answer : Error is the difference between measured value and true value.

Description : Superconducting materials are being used in the Superconducting Super Collider to: w) cool the particles. x) minimize electrical power consumption. y) maximize the acceleration potentials. z) provide radiation shielding.

Answer : ANSWER: X -- MINIMIZE ELECTRICAL POWER CONSUMPTION.

Description : An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a : (1) Power transmittor (2) Battery (3) Uninterrupted power supply (UPS) (4) Generator

Answer : Battery

Description : Copper wires are generally used for electrical power transmission instead of iron wire because : (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron 

Answer : copper is a better conductor of electricity than iron

Description : The unit of electrical power is (1) Bolt (2) Watt (3) Kilowatt hour (4) Ampere

Answer : Bolt

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