Quiz on Electrical Switchgear and Protection

National Level Quiz on Electrical Switchgear and Protection

Quiz on Electrical Switchgear and Protection

Question : Protective relays can be designed to respond to 

Answer : All of the above

 

Question : Protective relays are the devices that detect abnormal conditions in electrical circuits by measuring 

Answer : Constantly the electrical quantities which differ during normal and abnormal conditions

 

Question : The protective relays is provided to 

Answer : Close the contacts when the actuating quantity attains a certain predetermined value

 

Question : Various power system faults in increasing order of severity are 

Answer : LG,LL,LLG,LLLG

 

Question : Which of following are used to reduce short circuit fault currents 

Answer : Reactors

 

Question : Minimum faults occur in which of the following power system equipment? 

Answer : Alternator

 

Question : A relay is used to 

Answer : Sense the fault and direct to trip the circuit breaker

 

Question : Buchholz relay is used to protect against 

Answer : Every internal faults

 

Question : Instantaneous relay should operate within 

Answer : 0.01 sec

 

Question : MHO relay is inherently a 

Answer : Directional type

 

Question : Basic relay connection requirement is that the relay must operate for 

Answer : Internal faults

 

Question : What is the purpose of back up protection? 

Answer : To guard against failure of primary

 

Question : What is the actuating quantity for the relays? 

Answer : All of these

 

Question : Protective relays can be designed to respond to 

Answer : All of these

 

Question : On what factor does the operating speed of the relay depend upon? 

Answer : All of these

 

Question : What do protective relays provide? 

Answer : Close the contacts when the actuating quantity attains a certain predetermined value.

 

Question : Buchholz relays are used on 

Answer : Oil immersed power transformers of ratings above 500 kVA

 

Question : Buchholz relay cannot be used on 

Answer : Air cooled transformers

 

Question : Buchholz relay can detect faults..........oil level in the transformer. 

Answer : Below

 

Question : Which component ensures the safety of the line from damage? 

Answer : Relay