10/11 SS 1 and 2

Question 1

A well designed protective relay system should provide 3 basic operational characteristics. What are they?

Answer 1

All of the above

Reliability, selectivity, speed

Question 2

A high speed relay is defined as a relay that operating time that does not exceed

Answer 2

3-5 cycles

Question 3

Protective relay zones of protection are overlapped to:

Answer 3

Avoid leaving unprotected areas

Question 4

The accepted industry standard for showing relay contacts on circuit diagrams in the position they assume when the relay is

Answer 4

De-energized

Question 5

The device designation 52Y indicates the device is a

Answer 5

Circuit breaker anti-pump auxiliary

Question 6

The ground and neutral point in a 3 phase system are by definition the same point

Answer 6

False

Question 7

In a potential transformer, the voltage drop from the polarity to the non-polarity marked terminals on the primary side is substantially in-phase with the voltage drop from the polarity to the non-polarity marked terminals on the secondary side. (T or F)

Answer 7

True

Question 8

In a potential transformer, the current drop from the polarity to the non-polarity marked terminals on the primary side is substantially in-phase with the current drop from the polarity to the non-polarity marked terminals on the secondary side. (T or F)

Answer 8

True

Question 9

Open circuits on power systems occur more frequently than short circuit faults. (T or F)

Answer 9

False

Question 10

A high current arc (>100 amp) im air has a nearly constant voltage drip of around _____ volts per foot.

Answer 10

400

Question 11

The circuit diagram usually gives the following 3 items of info about currents and voltages (eliminate one).

Answer 11

Magnitude

Location, direction, polarity are correct

Question 12

The term symmetrical components refers to a mathematical method of reducing any unbalanced 3 phase set of vectors into 3 ________ systems.

Answer 12

Balanced