Description : What is static var compensator ?
Last Answer : Static VAR Compensator (SVC) SVC are use for regulating transmission voltage and for improving power quality of industrial load. SVC is made from one or more banks ... system. Static VAR Compensator is more reliable than dynamic compensation scheme like synchronous condenser.
Description : Static Synchronous Compensator (STATCOM)
Last Answer : Static Synchronous Compensator (STATCOM) STATCOM stands for Static Synchronous Compensator or Condenser. It may be a source of reactive power or sink of reactive AC power. It can ... and Controllers etc. STATCOM have symmetric lead-lag capability. STATCOM have no moving part.
Description : Is lavender (lavandula angustifolia var. rosea) hardy in zone 6b?
Last Answer : answer:Yes. Here where there are pockets of zone 5 (sheltered and sunny) it winters over.. On my windy hill that gets the brunt of the gales from the NW and is considered zone 4b, it does ... before the first heavy frost. You can have a bed entirely of the different species of lavender. Lucky you.
Description : The unit of apparent power in a purely inductive circuit is called the _____________. A. kva B. var C. emf D. watt
Last Answer : Answer: B
Description : What is purpose of reactive power (VAR)?
Last Answer : It is an energy required to built up magnetic field to drive the power.
Description : Certain strains of Streptococcus lactis var. maltigenes may produce A.bitter flavor B.acid flavor C.burnt or caramel flavor D.none of these
Last Answer : C.burnt or caramel flavor
Description : . Mimicry weed in rice field is a). Wild rice (Oryza sativa var fatua) b). Echinochloa colona c). Echinochloa crusgalli d). All of these
Last Answer : d). All of these
Description : Series capacitors on transmission lines are of little use when the load VAR requirement is (a) large (b) small (b) fluctuating (d) any of the above
Last Answer : (b) small
Last Answer : Series capacitors on transmission lines are of little use when the load VAR requirement is small.
Description : increases the steady state accuracy. (a) Integrator (b) Differentiator (c) Phase lead compensator (d) Phase lag compensator Ans:A 10.As a result of introduction of negative feedback which of the following will not decrease ? (a) Band width (b) Overall gain (c) Distortion (d) Instability
Last Answer : Ans: A
Description : A resistor placed in parallel to the output of a power supply _____________. A. is a temperature compensator B. corrects power factor C. prevents excessive currents D. aids in output voltage regulation
Last Answer : Answer: D
Description : In general, polyphase induction motors can be started on full line voltage by means of ______________. A. compensator starters B. autotransformer starters C. across-the-line starters D. primary-resistor starters
Last Answer : Answer: C
Description : Low horsepower, polyphase, induction motors can be started with full voltage by means of _____________. A. compensator starters B. autotransformer starters C. across-the-line starters D. primary-resistor starters
Description : Which of the following compensator will increase the bandwidth of the system: (1) Phase lag (3) Lag-Iead (2) Phase lead (4) None of these
Last Answer : Which of the following compensator will increase the bandwidth of the system: (1) Phase lag (3) Lag-Iead (2) Phase lead (4) None of these
Description : In lag compensator the damping ratio, gain and steady state error (ess) are (a) Decreases, Decreases and Increases (b) Decreases, Increases and Increases (c) Increases, Increases and Decreases (d) Increases, Decreases and Decreases
Last Answer : In lag compensator the damping ratio, gain and steady state error (ess) are Increases, Decreases and Decreases
Description : Which of the following is CORRECT with respect to a LAG-LEAD compensator ? (A) It is similar to PI controller (B) It acts as Band-pass filter (C) It is Second-order system with one zero, and two poles (D) It acts as a Band-reject filter
Last Answer : Which of the following is CORRECT with respect to a LAG-LEAD compensator ? (A) It is similar to PI controller (B) It acts as Band-pass filter (C) It is Second-order system with one zero, and two poles (D) It acts as a Band-reject filter
Description : The transfer function of a phase lead compensator is found to be the form (s+z1 ) / (s + p1 ) and that of a lag compensator to be of the form (s+z2 ) / (s + p2 ). Then which of the following conditions must be satisfied? ... (B) z1 > p1 and z2 < p2 (C) z1 < p1 and z2 < p2 (D) z1 < p1 and z2 > p2
Last Answer : A
Description : I'm Msc student in electrical engineering and my project in control of the UPFC can you help me ?
Last Answer : UPFC means unified power flow controller. The control on UPFC is based on vector control approch proposed by Schauder & Mehta for Advanced static VAR compensators in 1991
Description : A homo-polar HVDC link consists of (A) single-conductor with positive polarity (B) two conductors with one positive and another negative polarity (C ) two conductors having the same polarity with a ground return (D) single conductor with negative polarity and ground as positive polarity
Last Answer : two or more conductore having same polarity,usually nagative . and ground return ex: 1st conductore drain Id1 and 2nd drain Id2 than the return will be (Id1+Id2)
Description : What is the purpose of a capacitor in an AC circuit?
Last Answer : Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor
Description : How does a capacitor improve power factor?
Last Answer : Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.
Description : What is the formula for reactive power?
Last Answer : The formula for reactive power is, Reactive power = VI sin (phi) The unit of reactive power is VAR ( Volt ampere reactive). The reactive power is denoted by 'Q'. The formula for real power is, Real power = VI cos (phi) The unit of real power is watts. The real power is denoted by 'P'.
Description : reactive power is greater in load side compare to generator what will happen?
Last Answer : VI*sin()
Description : Objectives of shunt compensation
Last Answer : Objectives of shunt compensation Shunt compensation is use to improve power factor. In Shunt compensation FACTS are connected in parallel with power system and works like a controllable current ... voltage control and damp power oscillation. Examples of shunt compensation is STATCOM and SVC.
Description : Thyristor Switched Capacitor (TSC)
Last Answer : Thyristor Switched Capacitor (TSC) TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.
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 : Saturated Reactor (SR)
Last Answer : Saturated Reactor (SR) Saturated reactor is use for controlling reactive power. It consists of reactor and shunt capacitor bank. It is like a magnetic ... called amplification factor. The disadvantage of saturated reactor is its slow response.
Description : Difference between STATCOM and SVC?
Last Answer : Difference between STATCOM and SVC: STATCOM SVC Faster Slower than STATCOM Cost is high Cost is low Higher losses Less losses Better ... Smaller in size Larger in size Controllable voltage source Dynamically controlled reactance
Description : What is Synchronous condenser?
Last Answer : Synchronous condenser Big advantage of synchronous condenser is their large temporary overload capability and good harmonics performance. Synchronous condenser is ... ;voltage levels. Synchronous condenser have slow speed of response.
Description : what is TCSC?
Last Answer : Thyristor Controlled Series Capacitor (TCSC)
Description : what is UPFC?
Last Answer : UPFC stands for unified power flow controller. It's used for real time control & dynamic compensation of ac transmission system.