The stability of the power system is not affected by line losses
Description : steady-state stability of a power system is improved by
Last Answer : steady-state stability of a power system is improved by using double circuit line instead of single circuit line
Description : With fault clearing time, the transient stability of a power system
Last Answer : With fault clearing time, the transient stability of a power system decreases
Last Answer : The steady state stability of the power system can be increased by connecting lines in parallel.
Description : The steady state stability limit as compared to the transient state stability limit is always
Last Answer : The steady state stability limit as compared to the transient state stability limit is always Greater
Description : The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to an infinite bus (1) ignores line as well as synchronous machine resistance ... consideration the possibility of machine losing synchronism after it has survived during the first swing.
Last Answer : 1
Description : Generally in a power system network, the load is represented as a : (A) Constant power in both load flow study and in stability study (B) Constant power in load flow study and constant ... impedance in load flow study (D) Constant impedance in both load flow study and in stability study
Last Answer : Generally in a power system network, the load is represented as a : Constant power in load flow study and constant impedance in stability study
Description : The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile
Last Answer : The benefit of power factor correction in a power system is lower power consumption
Description : If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power ... factor is due to harmonic currents (D) total power factor is due to fundamental component of current
Last Answer : If non-linear loads are connected to the power system, then displacement power factor is not equal to the total power factor
Description : Define stability. Sketch the root locations in the s-plane for stable and unstable system.
Last Answer : Stability: The system is said to be stable if it produces bounded output for a bounded input. It is used to define usefulness of the system. The stability implies that the system performance should not ... absence of the input, output may not return to zero it shows certain output without input.
Description : Stability of a transmission line can be increased by
Last Answer : Stability of a transmission line can be increased by Shunt capacitor, Series capacitor
Description : If stability error for step input and speed of response be the criteria for design, what controller would you recommend (1) P controller (2) PD controller (3) PI controller (4) PID controller
Last Answer : If stability error for step input and speed of response be the criteria for design, what controller would you recommend (1) P controller (2) PD controller (3) PI controller (4) PID controller
Description : Which of the following statements is true? (1) steady-state stability limit is greater than transient stability limit (2) steady-state stability limit is equal to transient stability ... made regarding the equality or otherwise of the steady-state stability limit and transient stability limit
Last Answer : Which of the following statements is true? (1) steady-state stability limit is greater than transient stability limit (2) steady-state stability limit is equal to transient ... made regarding the equality or otherwise of the steady-state stability limit and transient stability limit
Description : Improvement of transient stability using SVC
Last Answer : Improvement of transient stability using SVC The static VAR compensator (SVC) is a shunt connected FACTS device. SVC have two modes one is inductive ... ;transmittable power. Transient stability improvement can be estimated using equal area criterion.
Description : Summerise the role of power system engineer.
Last Answer : Role of power system engineer: i. On the planning side he or she has to make decisions on how much electricity to generate ii. For operation of the power system he has to plan for ... for energy conservation and load management. viii. For solving the power system problems he has to update with
Description : State the functions of fuel system and exhaust system of a diesel power station.
Last Answer : Fuel system: It supplies fuel to engine for combustion purpose. It consists of Fuel Pump: - It supplies fuel to engine for combustion purpose. Strainer: - Are provided to remove suspended impurities and ... most of the noise. Chimney:- To exhaust gases in the atmosphere as high as possible.
Description : Explain starting system in diesel electric power plant.
Last Answer : Starting system in Diesel Electric Power Plant: It includes Storage battery, compressed air tanks, self-starter etc. The purpose of engine starting system is to rotate the engine initially while ... as Ammeters, Voltmeters, Wattmeters, Thermometers, Pressure gauges, Visible and audible alarm etc.
Description : Explain fuel system and air intake system in diesel electric power plant.
Last Answer : Fuel system and air intake system in diesel electric power plant : Fuel system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is supplied ... Filters are provided to remove dust particles from air which may act as abrasive in the engine cylinder.
Description : What is the choice of size and number of generator units in interconnected power system?
Last Answer : Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.
Description : A lightening arrester connected between the line and earth in a power system (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct ... suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it
Last Answer : A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges
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
Last 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 : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
Last Answer : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25
Description : Power factor of the system is kept high?
Last Answer : Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.
Last Answer : Commonly used instruments in power system measurement are induction.
Last Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.
Last Answer : The primary reason for low power factor is supply system is due to installation of induction motors.
Last Answer : Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.
Last 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.
Description : What is sag in power system?
Last Answer : Sag is a catenary curve in between two points of supporters.and also we can say the lowest point of the conductor in between the two points of supporters.
Description : What are interconnected power system?
Last Answer : Interconnected power systems are those which connect different geographic regions. In Australia we have a National Electricity Grid which connects 6 states. Transfers of power occur between the states depending ... make more profit from this.National-Electricity-Market-Fact-Sheet.pdf (0,9 MB)
Description : What is meant by feeder in power system?
Last 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 are the components of a power system?
Last Answer : generator Traansformer Conductors Insulators
Description : Diffecult questions
Last Answer : No. Please send me
Description : Why is there no formula to compute the half-life of any given radioisotope?
Last Answer : I don’t think the theories contain enough information about what is actually going on with subatomic particles that leads to those results.
Description : The main criterion for selection of the size of a radial distribution system is
Last Answer : The main criterion for selection of the size of a radial distribution system is voltage drop
Description : The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero
Last Answer : The sequence components of current of a single-phase load connected to a 3-phase system are equal positive, negative and zero sequence components
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
Last 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 : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when
Last Answer : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when The incremental fuel cost of each plant multiplied by the penalty factor is the same
Description : An _____________is a network of electrical components used to supply, transfer and use electric power: (A) Electric power system (B) Electric power (C) All of the above (D) None of the above
Last Answer : An Electric power system is a network of electrical components used to supply, transfer and use electric power.
Description : A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging
Last Answer : 0
Description : The capital cost of a power plant depends on (1) Total installed capacity only. (2) Total number of units only. (3) Total installed capacity and number of units as well. (4) Neither the installed capacity nor number of units
Last Answer : The capital cost of a power plant depends on Total installed capacity and number of units as well.
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
Last Answer : Load compensation in power systems is a process to : Maintain better voltage profile
Description : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh
Last Answer : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh
Description : The storage battery generally used in electric power stations is (1) zinc carbon battery (2) lead acid battery (3) nickel cadmium battery (4) lithium -ion battery
Last Answer : The storage battery generally used in electric power stations is lead acid battery
Description : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as
Last Answer : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line
Description : 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
Last Answer : The power flow problem mathematical model for a linear transmission network is non-linear
Description : The steady state stability of the power system can be improved by (A) using machines of high impedance (B) connecting transmission lines in series. (C) connecting lines in parallel. (D) reducing, the excitation of the machines.
Last Answer : The steady state stability of the power system can be improved by connecting lines in parallel.
Description : Describe the use of Pneumatic system in daily life.
Last Answer : I. Automatic tyres are inflated with compressed air. II. Spray guns use compressed air for spraying paints. III. Compressed air is used in air powered tools like hammers and drills IV. It is also used in air brake system in heavy vehicles.
Description : Write short note on UPS and its usage in railway system.
Last Answer : Ans. Ideally, the voltage supply by the utility system should be perfect sine wave without any harmonics, at its nominal frequency of 50 Hz and at its nominal magnitude. In practice however voltage can ... load from one source to the other results in the least amount of disturbance seen by the load.
Description : Septic System Design
Last Answer : Most people, when they get their own property, take all their time designing and building the house first and worry about the septic system later. For the most part it works out just fine, the house is built ... that it's a bad choice-it isn't-but it's practical to always go for the least expensive.
Description : The Lymphatic System
Last Answer : An Overview of the Lymphatic System The lymphatic system refers to a type of network in the body that consists of the lymphoid organs, lymphatic tissues, lymph ducts, lymph nodes, lymph vessels and ... many ways in which the lymphatic system takes action in a lot of the human body's processes.