video 1.3

Question 1:  WHAT FACTORS AFFECT THE ROLE ADEQUATENSESS?

• A.   Power rating of the element that the relay will protect.

• b.   Position, importance and cost of the element and the effect of the element failure on the power feeding continuity (like the  generrators)

• C.   According to the importance of the protected element we select the suitable protection system.

• D.  All answers are correct

Question  2:  What is the selectivity of the protection system?

• A.   is the ability of the protection to detect and eliminate the correct fault element from the system

• B. is the limit the destructive level of the system

• C. is the ability of the protection to detect the system

• D.   Make sure the device is working properly

Question  3: Prerequisites of the protection system?

• A. Dependability, security, reliability, selectivity, sensitivity, adequateness, speed, stabilitity, economics.

• B. Dependability, security, reliability, selectivity, sensivity, adequateness, speed, stability, economics.

• C. Dependability, security, reliability, selectivity, sensitivity, adequateness, speed.

• D. Selectivity, speed, sensitivity and , reliability.

Question 4: What are the factors affecting the adequacy of the protection system?

•      A. rated power of the element that the relay protects

•      B. short circuit current

•      C. generator power

•      D. large fault current

Question 5:How long will the full currents pass through the bars?

•     A . 75 (ms)

•     B.  80 (ms)

•     C.  90 (ms)

•     D. 100 (ms)

Question 6: What is the eighth property of the protection system?

• a. Dependability

• b. sensitivity

• c.  stability

• d. economics.

Question 7:  how much time , the basbar will not be affected or it will not be permitted out as of the fault?

• A. one hundred milliseconds.

• B, ten seconds

• C. six seconds

• D. C and B

Question 8: What type of relay matches the error it detects?

• a.  overcurrent relay

• b.  Time relay

• c.  Thermal relay

• d.   intermediate relay

Question 9: What is the fifth attribute of the protection system?

•     A . completeness

•     B.  sensitivity

•     C. selectivity

•     D. economy

Question 10: How much time does the slow system take to fix the problem mentioned in the article?

• a.      3 seconds

• b.      4 seconds

• c.      5 seconds

• d. 6 seconds