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Switchgear and protection
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ Relays can be designed to respond to
changes in all above [other wrong options] [Discuss in forum] |
| Q2 ⇒ The current zero interruption, in oil
and air blast circuit breakers, is achieved
by both (a) and (b) [other wrong options] [Discuss in forum] |
| Q3 ⇒ Protective relays are devices that detect
abnormal conditions in electrical circuits
by measuring constantly the electrical quantities which differ during normal and abnormal conditions [other wrong options] [Discuss in forum] |
| Q4 ⇒ Insulation resistance of high voltage
circuit breakers is more than 100 mega ohms [other wrong options] [Discuss in forum] |
| Q5 ⇒ Wave trap is used to trap waves of higher frequencies entering generator or transformer units [other wrong options] [Discuss in forum] |
| Q6 ⇒ Induction cup relay is operated due to
changes in all of the above [other wrong options] [Discuss in forum] |
| Q7 ⇒ For which of the following protection
from negative sequence currents is
provided ? Generators [other wrong options] [Discuss in forum] |
| Q8 ⇒ Which of the following parameter can
be neglected for a short line ? Capacitance [other wrong options] [Discuss in forum] |
| Q9 ⇒ Overfluxing protection is recommended
for generator transformer of the power plant [other wrong options] [Discuss in forum] |
| Q10 ⇒ A fuse is connected in series with circuit [other wrong options] [Discuss in forum] |
| Q11 ⇒ To limit short-circuit current in a power
system ____ are used. reactors [other wrong options] [Discuss in forum] |
| Q12 ⇒ Which of the following relays is used for
protection of motors against overload ? Thermal relay [other wrong options] [Discuss in forum] |
| Q13 ⇒ The rating of a circuit breaker is
generally determined on the basis of symmetrical fault current [other wrong options] [Discuss in forum] |
| Q14 ⇒ Merz-Price protection is used for alternators [other wrong options] [Discuss in forum] |
| Q15 ⇒ The material used for bus-bars should
have all of the above [other wrong options] [Discuss in forum] |
| Q16 ⇒ Outdoor switchgear is generally used
for voltage beyond 66 kV [other wrong options] [Discuss in forum] |
| Q17 ⇒ SF6 gas is nontoxic [other wrong options] [Discuss in forum] |
| Q18 ⇒ Overload relays are of ____ type. all above [other wrong options] [Discuss in forum] |
| Q19 ⇒ Air blast circuit breaker is used for repeated duty [other wrong options] [Discuss in forum] |
| Q20 ⇒ The voltage appearing across the contacts
after opening of the circuit breaker
is called ____ voltage. recovery [other wrong options] [Discuss in forum] |
| Or |