Virtual Labs

Control of Group Operated Switches (GOS) from workstation

_______is used to make sure that an electrical circuit can be completely de-energized for service or maintenance

a: Circuit Breaker Explanation

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b: Isolator Explanation

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c: Fuse Explanation

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d: None Explanation

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The major difference between an isolator and a circuit breaker is that

a: A CB is an off load device insulated to be opened only after current has been interrupted by some other after control device Explanation

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b: An isolator is an off load device intended to be opened only after current has been interrupted by some other control device Explanation

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c: Both A CB is an off load device insulated to be opened only after current has been interrupted by some other after control device and An isolator is an off load device intended to be opened only after current has been interrupted by some other control device Explanation

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d: None Explanation

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Consider the above diagram, GOS1, GOS2 represents isolators and CB1, CB2 represents circuit breakers. So when the transformer is required to take out for maintenance, what is the procedure: -

a: Circuit breaker is taken out first and isolators are taken out second Explanation

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b: Isolators are taken out first and circuit breaker is taken out second Explanation

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c: Both Circuit breaker is taken out first and isolators are taken out second and Isolators are taken out first and circuit breaker is taken out second are true Explanation

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d: None Explanation

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Statement 1: In GIS, All the live parts are fully enclosed in grounded metal enclosures. Thus, there is no danger of an electrical shock.
Statement 2: In SF6-GIS, SF6 is an inert, non-flammable, non-toxic and odourless gas used as an insulation and arc-extinguishing medium. Therefore, it is safe for personal and therefore is no fire hazard.

a: Statement1 is true and statement2 is false Explanation

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b: Statement1 is false and statement2 is true Explanation

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c: Statement1 and statement2 both are true Explanation

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d: Statement1 and statement2 both are false Explanation

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The apparatus used for switching, controlling and protecting the electrical circuit and equipment is known as

a: Control panels Explanation

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b: Metering panels Explanation

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c: Circuit breakers Explanation

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d: Switchgear Explanation

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Switchgear consist of:

a: Switched, Fuses, CB, isolators Explanation

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b: Relay, control panels, metering panels Explanation

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c: Lightning arrestors, current transformers potential transformer etc Explanation

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d: All Explanation

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Essential features of switchgear are

a: The switchgear must be able to discriminate between faulty and healthy section Explanation

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b: The switchgear must be able to discriminate between faulty and healthy section Explanation

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c: Provision for manual control and instruments Explanation

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d: All Explanation

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