What do you understand by station black out?

1 Answer

Answer :

When class IV and class III power supply fails and DG’s cannot be started and also this condition prevails for 5 minutes then it is called station black out condition.  

Related questions

Description : What is station Black out condition? 

Last Answer : Simultaneous failures of class IV and class III supply is called Station Black out. In this condition class II power UPS will feed the necessary loads for a 30 minutes of duration. After that supplementary ... (SCR) 5 kVA UPS is used for secondary shut down system (SSS) ion chamber amplifier. 

Description : How can I learn to read and understand all the cool stuff on the blackboards in a science documentary, like Nova from PBS(Public Broadcasting Station) ?

Last Answer : answer:Take notes while viewing. Then treat your notes as as a research project. Start with item number one. Take your time. The internet is the most amazing library of all time. None of us, ... on food and nutrition, for example, he eats some pretty weird stuff to make the program interesting.

Description : Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out? A. De-energize the applicable switchboard bus. B. Bypass the interlocks. C. ... supply circuit breaker in the open position. D. Station a man at the circuit supply switch.

Last Answer : Answer: C

Description : Operation carried out in Thermal power station?

Last Answer : The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine; the turbine which is coupled with the generator generates the electricity

Description : What are the operation carried out in Thermal power station?

Last Answer : A: The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine, the turbine which is coupled with the generator generates the electricity

Description : List out the components of station output system. 

Last Answer : Main generator, Generator transformer, PT, CT, CVT, lightning arrestor, wave trap, main 220 kV bus, transfer bus, SF6 circuit breakers and isolators, line protection scheme, GT and Generator protection scheme, bus bar protection scheme etc.  

Description : What do you understand by tan delta for a insulating material?

Last Answer : Tan delta measurement is done to find the qualities of insulating material. Tan delta is angle between current due to surface leakage or current due to capacitance and the capacitive current. That is Tan δ = Ir / Ic. 

Description : What are the main two divisions of MAPS electrical system and what do you understand by it? 

Last Answer : The two main divisions of MAPS electrical system are a. Main output system. Output system supplies power to the grid. Generated voltage is stepped up to 220 kV from 16.5 kV and supplied to grid. b. ... voltage is stepped down to 6.6 kV and 415 V from 16.5 kV and supplies to auxiliary loads. 

Description : Which of the following station is least efficient........ A.Nuclear power plant B.Diesel power station C.Thermal power station D.None of the above

Last Answer : Ans: C

Description : Coast Guard Regulations (46 CFR), require that an indicating light at the propulsion control station will operate if overloading or overheating occurs in a _______________. A. forced draft blower motor B. steering gear motor C. fuel pump motor D. condensate pump motor

Last Answer : Answer: B

Description : Sound powered telephone units 'I', 'II', and 'III' of the circuit shown in the illustration are for 'station numbers' _____________. EL-0093 A. 2, 4 and 6 B. 1, 2 and 3 C. 3, 5 and 8 D. 1, 2 and 6

Last Answer : Answer: D

Description : An overload in which of the listed motors will result in the illumination of an indicating light at the propulsion control station alarm panel? A. Fuel pump motor B. Steering motor C. Condensate pump motor D. Forced draft blower motor

Last Answer : Answer: B

Description : Sections 'I', 'II' and 'III' of the circuit shown in the illustration are 'station numbers' _____________. EL-0093 A. 2, 4 and 6 B. 1, 2 and 3 C. 3, 5 and 8 D. 1, 2 and 6

Last Answer : Answer: D

Description : If coil 'R1-R2' on the transmitter in figure 'A' shown in the illustration is turned 30 degrees clockwise, corresponding coil 'R1-R2' on the receiver should ____________. EL-0092 A. make coils 'S1 ... a higher voltage depending on the turns ratio D. align itself to the same position if free to move

Last Answer : Answer: D

Description : The pushbutton on the handset of a ship's sound-powered telephone must be depressed to ______________. A. talk then released to listen B. listen then released to talk C. both talk and listen D. ring the station being called

Last Answer : Answer: C

Description : Which of the following statements is correct concerning the circuits in a sound powered telephone system? A. The ringing circuit is composed of only one common wire to ground. B. The common ... connected to each station. D. The talking and calling circuits are electrically dependent upon each other.

Last Answer : Answer: B

Description : Factors on which material of station busbar depends?

Last Answer : Some of the factors on which station busbar depends are: Current Carrying capacity Short Circuit Stresses Establishing minimum electrical clearances

Description : List the factors to be considered while choosing a site for steam power station:

Last Answer : 1.Supply of fuel 2.Availability of water 3.Transportation facilities 4.Cost and type of land 5.Nearness to load centres 6.Distance from populated area

Description : What are the activities by which performance of the station will be judged? 

Last Answer : Activities of station by which performance is judged by public a. Capacity factor. b. Availability factor. c. Radiation release (gas and liquid effluents). d. Thermal release. e. Man-rem. f. ... l. The profit earned by the Plant. m. The quality and cleanliness in and around the Plant. 

Description : Why battery room should be located separately in a power station? 

Last Answer : Possibility of battery explosion Corrosive atmosphere by acid spray. Fire hazard. 

Description : What is the station ground resistance?

Last Answer : Less than 0.5 ohms.  

Description : What are the problems in station operation due to grid under frequency?

Last Answer : a) Turbine having under frequency limitation, house load happen if < 48 Hz b) Due to under frequency PHT flow reduces, therefore reactor power reduces, generator power reduces c) If frequency is ... Hz DG cannot be synchronised to grid, therefore DG kept on isolation running d) GT overfluxing. 

Description : What are the problems in station operation due to grid under voltage?

Last Answer : a) All the HT motors overloaded. b) VAR load increases on generator leads to heating up of rotor c) Stator current increases for same power export leads to stator over heating.

Description : A generating station has a maximum demand of 50 Mw, a load factor of 60%, a plant capacity factor of 45% and if the plant while running as per schedule, were fully loaded. The daily energy produced will be

Last Answer : A generating station has a maximum demand of 50 Mw, a load factor of 60%, a plant capacity factor of 45% and if the plant while running as per schedule, were fully loaded. The daily energy produced will be 720 MW.

Description : Does anyone understand why it took so long to get a Black quarterback in the NFL?

Last Answer : Racism. It was assumed that they didn't have the mental capacity to handle the complexity of running an NFL offense. Clearly, that isn't true. But, McNabb is by no means the first black quarterback in the ... Russell. The landscape is changing. I'm not an expert on this, I'm sure I'm missing some.

Description : What do you understand by the word regur ? (a) Black soil found in the Deccan (b) Grey-brown soil found in Russia (c) Red, colour sticky soil, found in the Amazon area (d) Black soil found in northern Argentina shop.ssbcrack.com

Last Answer : Ans: (a)