Online Access Free H12-411 Exam Questions

MCB circuit breaker can be divided into B, C, D, Z, K class according to different tripping characteristics. For IT loads, the () level tripping characteristics should be used.

• A.B
• B.Z
• C.C
• D.D

There are three different categories of earthing (TN, TT and IT) in low voltage distribution systems. The second capital letter represents ().

• A.Said the relationship between power receiving system exposed conductive parts and the ground
• B.Indicates the relationship of the power system to the exposed conductive parts of the power receiving system
• C.shows the relationship between neutral N and protective earth PE
• D.Indicates the relationship of the power system on the ground

The features of UPS are (). (Multiple Choice)

• A.Anti-voltage surge
• B.continue to supply power to the load when there is no utility power
• C.Steady frequency
• D.steady voltage

Whare are UPS common working modes? (Multiple choice)

• A.The main road inverter mode
• B.Offline mode
• C.Battery mode
• D.Static bypass mode

Ascending workers should be equipped with the seat belts which is necessary and meeted the safety requirements, and use properly and reasonably according to the use of the provisions: meanwhile, should have guardian's guardianship.

• A.True
• B.False