Switchgear protections

23. Overheating of relay contacts or contact born out is due to

slow making and breaking of load circuit contacts
foreign matter on the contact surface
too low contact pressure
all of the above

Join Our Telegram Channel
Subscribe on YouTube

or contact born out is due to" class="read-more button" href="https://exam.pscnotes.com/mcq/overheating-of-relay-contacts-or-contact-born-out-is-due-to/#more-47143">Detailed SolutionOverheating of relay contacts or contact born out is due to

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

mechanical vibration
insulation failure
loose connection
impulse voltage

Join Our Telegram Channel
Subscribe on YouTube

of" class="read-more button" href="https://exam.pscnotes.com/mcq/the-short-circuit-in-any-winding-of-the-transformer-is-the-result-of/#more-46949">Detailed SolutionThe short circuit in any winding of the transformer is the result of

25. A balanced 3-phase system consists of

zero sequence currents only
positive sequence currents only
negative and zero sequence currents
zero, negative and positive sequence currents

Join Our Telegram Channel
Subscribe on YouTube

3-phase system consists of" class="read-more button" href="https://exam.pscnotes.com/mcq/a-balanced-3-phase-system-consists-of/#more-46914">Detailed SolutionA balanced 3-phase system consists of

26. Protective relays are devices that detect abnormal conditions in electrical circuits by measuring

current during abnormal condition
voltage during abnormal condition
constantly the electrical quantities which differ during normal and abnormal conditions

Detailed SolutionProtective relays are devices that detect abnormal conditions in electrical circuits by measuring

27. On which of the following routine tests are conducted ?

Oil circuit breakers
Air blast circuit breakers
Minimum oil circuit breakers
All of the above

Join Our Telegram Channel

64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube the following routine tests are conducted ?" class="read-more button" href="https://exam.pscnotes.com/mcq/on-which-of-the-following-routine-tests-are-conducted/#more-46673">Detailed SolutionOn which of the following routine tests are conducted ?

28. Which of the following parameter can be neglected for a short line?

Inductance
Capacitance
Resistance
Reactance

Join Our Telegram Channel
Subscribe on YouTube

href="https://exam.pscnotes.com/mcq/which-of-the-following-parameter-can-be-neglected-for-a-short-line/#more-46598">Detailed SolutionWhich of the following parameter can be neglected for a short line?

29. For the protection of power station buildings against direct strokes the requirements are

interception
interception and conduction
interception, conduction and dissipation
interception, conduction, dissipation and reflection E. none of the above

Detailed SolutionFor the protection

Join Our Telegram Channel
Subscribe on YouTube
of power station buildings against direct strokes the requirements are

30. If the fault occurs near the impedance relay, the VII ratio will be

constant for all distances
lower than that of if fault occurs away from the relay
higher than that of if fault occurs away from the relay
none of the above

Join Our Telegram Channel

VII ratio will be" class="read-more button" href="https://exam.pscnotes.com/mcq/if-the-fault-occurs-near-the-impedance-relay-the-vii-ratio-will-be/#more-46075">Detailed SolutionIf the
Subscribe on YouTube
fault occurs near the impedance relay, the VII ratio will be
Page 1Page 2Page 3Page 4Page 5
Test 1Test 2
Exit mobile version