Q201. The main purpose of FACTS devices in a power system is:
A) Control power flow and enhance stability
B) Improve frequency regulation
C) Replace circuit breakers
D) None
Ans: A
Q202. The term FACTS stands for:
A) Flexible AC Transmission Systems
B) Fixed AC Transmission System
C) Fast Alternating Control System
D) None
Ans: A
Q203. The major advantage of FACTS controllers is:
A) Fast response
B) Reduced losses
C) Increased power transfer capability
D) All
Ans: D
Q204. The basic control parameter of a FACTS device is:
A) Voltage, current, or impedance
B) Frequency
C) Temperature
D) Power factor only
Ans: A
Q205. The SVC (Static VAR Compensator) controls:
A) Reactive power
B) Active power
C) Frequency
D) None
Ans: A
Q206. SVC is a:
A) Shunt-connected FACTS device
B) Series-connected FACTS device
C) Hybrid device
D) None
Ans: A
Q207. The SVC operates by controlling:
A) Firing angle of thyristors
B) Power factor
C) Slip of machines
D) None
Ans: A
Q208. TCR in SVC stands for:
A) Thyristor Controlled Reactor
B) Thyristor Connected Regulator
C) Transformer Controlled Rectifier
D) None
Ans: A
Q209. TSC stands for:
A) Thyristor Switched Capacitor
B) Transformer Switched Converter
C) Transient Synchronous Controller
D) None
Ans: A
Q210. The function of TCR and TSC combination in SVC is to:
A) Control reactive power continuously
B) Control active power
C) Control voltage frequency
D) None
Ans: A
Q211. The output of an SVC can be represented as a:
A) Variable susceptance
B) Fixed capacitance
C) Inductive reactance
D) None
Ans: A
Q212. The main function of STATCOM is:
A) Provide fast reactive power compensation
B) Provide active power
C) Step-up voltage
D) None
Ans: A
Q213. STATCOM stands for:
A) Static Synchronous Compensator
B) Stationary Computer
C) Static Communication
D) None
Ans: A
Q214. STATCOM uses:
A) Voltage Source Converter (VSC)
B) Current Source Converter (CSC)
C) Synchronous generator
D) None
Ans: A
Q215. The reactive power generated by STATCOM is proportional to:
A) Voltage difference between converter and system
B) Line impedance
C) Frequency deviation
D) None
Ans: A
Q216. A STATCOM can operate in:
A) Capacitive and inductive modes
B) Only capacitive mode
C) Only inductive mode
D) None
Ans: A
Q217. The UPFC (Unified Power Flow Controller) can control:
A) Voltage, impedance, and phase angle
B) Frequency only
C) Power factor only
D) None
Ans: A
Q218. The UPFC is a combination of:
A) STATCOM and SSSC
B) SVC and TCSC
C) TCR and TSC
D) None
Ans: A
Q219. The main advantage of UPFC is:
A) Simultaneous control of real and reactive power
B) Cost reduction
C) Easy installation
D) None
Ans: A
Q220. The HVDC system transmits power using:
A) Direct current
B) Alternating current
C) Both
D) None
Ans: A
Q221. HVDC transmission is preferred for:
A) Long-distance, high-power transmission
B) Short-distance only
C) Urban distribution
D) None
Ans: A
Q222. The terminal converters in HVDC are:
A) Rectifier and inverter
B) Generator and motor
C) Transformer and capacitor
D) None
Ans: A
Q223. The main advantage of HVDC is:
A) No reactive power loss
B) No charging current
C) No skin effect
D) All of the above
Ans: D
Q224. The basic configuration of an HVDC link is:
A) Monopolar, Bipolar, or Homopolar
B) Series only
C) Parallel only
D) None
Ans: A
Q225. A monopolar HVDC link uses:
A) One conductor and ground return
B) Two conductors
C) No return path
D) None
Ans: A
Q226. A bipolar HVDC system has:
A) Two conductors with opposite polarity
B) Two positive conductors
C) Neutral connection only
D) None
Ans: A
Q227. The converter in HVDC uses:
A) Thyristors or IGBTs
B) Induction coils
C) Relays
D) None
Ans: A
Q228. The commutation process in HVDC converters is assisted by:
A) AC system voltage
B) DC circuit
C) Transformer
D) None
Ans: A
Q229. The main disadvantage of HVDC transmission is:
A) High converter cost
B) High losses
C) High corona
D) None
Ans: A
Q230. The typical voltage rating of an HVDC link is:
A) 500 kV and above
B) 100 kV
C) 33 kV
D) None
Ans: A
Q231. The control of power in an HVDC link is achieved by:
A) Changing firing angle of converter
B) Changing transformer tap
C) Shunt capacitor
D) None
Ans: A
Q232. In HVDC, power reversal is achieved by:
A) Reversing voltage polarity
B) Reversing current direction
C) Reversing both
D) None
Ans: B
Q233. Converter efficiency in HVDC transmission is approximately:
A) 97–99%
B) 70%
C) 50%
D) None
Ans: A
Q234. The reactive power demand of a converter station is supplied by:
A) AC filters and shunt capacitors
B) Transmission line
C) Load
D) None
Ans: A
Q235. A major issue in HVDC converters is:
A) Harmonic generation
B) DC voltage fluctuation
C) Commutation failure
D) All
Ans: D
Q236. Filters in HVDC systems are used to:
A) Eliminate harmonics
B) Improve voltage regulation
C) Reduce losses
D) None
Ans: A
Q237. In a 6-pulse converter, dominant harmonics are of order:
A) 5, 7, 11, 13
B) 2, 3, 4
C) 1 only
D) None
Ans: A
Q238. For 12-pulse converter, lowest harmonic is:
A) 11th
B) 5th
C) 7th
D) None
Ans: A
Q239. The reactive power consumed by a converter ≈
A) 0.5 × active power
B) Equal to active power
C) 10% of active power
D) None
Ans: A
Q240. Reactive power compensation in HVDC is provided by:
A) SVC or STATCOM
B) Reactor
C) Transformer
D) None
Ans: A
Q241. The basic control modes in HVDC systems are:
A) Constant current and constant extinction angle
B) Constant frequency
C) Constant voltage
D) None
Ans: A
Q242. The extinction angle (γ) is typically:
A) 15–20°
B) 0°
C) 90°
D) 45°
Ans: A
Q243. The overlap angle (μ) increases with:
A) Load current
B) Voltage
C) Frequency
D) None
Ans: A
Q244. The purpose of converter transformer is:
A) Provide isolation and tap control
B) Step-up frequency
C) Reduce harmonics
D) None
Ans: A
Q245. A back-to-back HVDC link connects:
A) Two AC systems at same location
B) Long-distance stations
C) Parallel DC lines
D) None
Ans: A
Q246. The advantage of back-to-back HVDC is:
A) Interconnection of asynchronous AC systems
B) Frequency synchronization
C) Cost reduction
D) None
Ans: A
Q247. The power reversal in back-to-back HVDC is achieved by:
A) Reversing converter control
B) Switching lines
C) Reversing transformer
D) None
Ans: A
Q248. The HVDC Light technology uses:
A) Voltage source converters
B) Current source converters
C) Thyristor bridges
D) None
Ans: A
Q249. HVDC Light can independently control:
A) Active and reactive power
B) Only active power
C) Only reactive power
D) None
Ans: A
Q250. FACTS devices improve transient stability by:
A) Rapid control of power flow
B) Increasing system inertia
C) Reducing reactance
D) None
Ans: A
No comments:
Post a Comment