[amp_mcq option1=”power frequencies” option2=”higher frequencies entering generator or transformer units” option3=”either of the above” option4=”none of the above” correct=”option3″]
Switchgear protections
2. Circuit breakers are essentially
[amp_mcq option1=”current carrying contacts called electrodes” option2=”arc extinguishers” option3=”circuits to break the system” option4=”transformers to isolate the two systems E. any of the above” correct=”option1″]
3. SF6 gas
[amp_mcq option1=”Is yellow in colour” option2=”Is lighter than air” option3=”Is nontoxic” option4=”Has pungent small E. None of the above” correct=”option3″]
4. Induction cup relay is operated due to changes in
[amp_mcq option1=”current” option2=”voltage” option3=”impedance” option4=”all of the above” correct=”option1″]
Detailed SolutionInduction cup relay is operated due to changes in
5. The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
[amp_mcq option1=”recovery” option2=”surge” option3=”operating” option4=”arc E. none of the above” correct=”option3″]
6. A fuse is connected
[amp_mcq option1=”in series with circuit” option2=”in parallel with circuit” option3=”either in series or in parallel with circuit” option4=”none of the above” correct=”option1″]
7. Overload relays are of type.
[amp_mcq option1=”induction” option2=”solid state” option3=”thermal” option4=”electromagnetic E. all above” correct=”option1″]
8. The delay fuses are used for the protection of ________ .
[amp_mcq option1=”motors” option2=”power outlet circuits” option3=”fluorescent lamps” option4=”light circuits” correct=”option1″]
Detailed SolutionThe delay fuses are used for the protection of ________ .
9. Discrimination between main and back up protection is provided by the use of relays which are
[amp_mcq option1=”fact” option2=”sensitive” option3=”slow” option4=”none of the above” correct=”option2″]
10. Fault diverters are basically
[amp_mcq option1=”fuses” option2=”relays” option3=”fast switches” option4=”circuit breakers” correct=”option4″]