ACES EE TRIVIA - 1

For a detection of the occurrence of the severe synchronizing power surges

• impedance relays are best suited

• reactance relays are best suited

• MHO relays are best suited

• split phase relays are best suited

The protection from negative sequence currents is provided for

• transformers

• generator

• motor

• transmission lines

If the height of the transmission tower is decreased, the capacitance of the line will

• increase

• decrease

• remains same

• decrease exponentially

AC system has the following disadvantage over DC system

• skin effect exists

• line regulation is more

• charging current exists

• proximity effects exists

The power loss is important for the design of

• generator

• motor

• feeder

• transmission line

For 11KV underground system, it is possible to work upon a length of

• 800 miles

• 100 miles

• 400 miles

• 10 miles

Series capacitors are used to

• improve the line voltage

• compensate for line capacitive reactance

• compensate for line inductive reactance

• none of the above

The short circuit in any winding of the transformer is the result of

• impulse voltage

• insulation failure

• mechanical vibrations

• loose connection

Split phase relaying responds to faults between turns of a transformer

• true

• false

• maybe

• none of these

Which of the following relays are used for phase fault on long line?

• impedance relays

• reactance relays

• MHO relays

• over current relays