Electrical Engineering : Switchgear Protections QUESTIONS AND ANSWERS :: part3 : 6 to 10
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.Which of the following circuit breakers has high reliability and minimum maintenance ? |
| Air blast circuit breakers |
| Circuit breaker with SF6 gas |
| Vacuum circuit breakers |
| Oil circuit breakers |
7.Arc in a circuit breaker is interrupted at |
| zero current |
| maximum current |
| minimum voltage |
| maximum voltage |
8.For which of the following protection from negative sequence currents is provided ? |
| Generators |
| Motors |
| Transmission line |
| Transformers |
9.Which of the following statements is incorrect ? |
| Lightning arrestors are used before the switchgear |
| Shunt reactors are used as compensation reactors |
| The peak short current is (1.8 xV2) times the A.C. component |
| The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance |
10.A.C. network analyser is used to solve problems of |
| load flow |
| load flow and short-circuit |
| load flow and stability |
| load flow, short-circuit and stability |
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